93 YJ spark / vacuum problem?
 

93 YJ 4.0 automatic

Are there any recommended procedures for checking for a spark problem?

Vacuum leaks?

tranny shop tells me that the transmission is good and that I either have a
spark or vacuum problem --- I feel like I'm getting the run around but want
to explore all possibilities before calling the guy a thief.

tia
paul

Re: 93 YJ spark / vacuum problem?
 

What is the problem? Describe what is/what is not happening with the
vehicle. I take it your transmission isn't shifting right, or has some
other transmission-related problem. If there were a spark problem, you
would notice the engine running rough. It would be odd for spark, or lack
thereof, to only affect the transmission.

Earle

"paul" <SPAMpdrapeau@wi.rr.com> wrote in message
news:46264e74$0$21074$4c368faf@roadrunner.com...
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have
a
> spark or vacuum problem --- I feel like I'm getting the run around but
want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

What is the problem? Describe what is/what is not happening with the
vehicle. I take it your transmission isn't shifting right, or has some
other transmission-related problem. If there were a spark problem, you
would notice the engine running rough. It would be odd for spark, or lack
thereof, to only affect the transmission.

Earle

"paul" <SPAMpdrapeau@wi.rr.com> wrote in message
news:46264e74$0$21074$4c368faf@roadrunner.com...
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have
a
> spark or vacuum problem --- I feel like I'm getting the run around but
want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

What is the problem? Describe what is/what is not happening with the
vehicle. I take it your transmission isn't shifting right, or has some
other transmission-related problem. If there were a spark problem, you
would notice the engine running rough. It would be odd for spark, or lack
thereof, to only affect the transmission.

Earle

"paul" <SPAMpdrapeau@wi.rr.com> wrote in message
news:46264e74$0$21074$4c368faf@roadrunner.com...
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have
a
> spark or vacuum problem --- I feel like I'm getting the run around but
want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

What is the problem? Describe what is/what is not happening with the
vehicle. I take it your transmission isn't shifting right, or has some
other transmission-related problem. If there were a spark problem, you
would notice the engine running rough. It would be odd for spark, or lack
thereof, to only affect the transmission.

Earle

"paul" <SPAMpdrapeau@wi.rr.com> wrote in message
news:46264e74$0$21074$4c368faf@roadrunner.com...
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have
a
> spark or vacuum problem --- I feel like I'm getting the run around but
want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

The throttle position sensor is notorious forgetting a bad connection.
It controls the shift points on the tranny.

I recommend an electronic spray contact cleaner on it, well all of the
computer sensor plugs for that matter like like CPS. I then like to rub
some dielectric grease on the plug's seal skirt.

WD40 will even work in a pinch, it just doesn't last long.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

paul wrote:
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have a
> spark or vacuum problem --- I feel like I'm getting the run around but want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

The throttle position sensor is notorious forgetting a bad connection.
It controls the shift points on the tranny.

I recommend an electronic spray contact cleaner on it, well all of the
computer sensor plugs for that matter like like CPS. I then like to rub
some dielectric grease on the plug's seal skirt.

WD40 will even work in a pinch, it just doesn't last long.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

paul wrote:
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have a
> spark or vacuum problem --- I feel like I'm getting the run around but want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

The throttle position sensor is notorious forgetting a bad connection.
It controls the shift points on the tranny.

I recommend an electronic spray contact cleaner on it, well all of the
computer sensor plugs for that matter like like CPS. I then like to rub
some dielectric grease on the plug's seal skirt.

WD40 will even work in a pinch, it just doesn't last long.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

paul wrote:
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have a
> spark or vacuum problem --- I feel like I'm getting the run around but want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

The throttle position sensor is notorious forgetting a bad connection.
It controls the shift points on the tranny.

I recommend an electronic spray contact cleaner on it, well all of the
computer sensor plugs for that matter like like CPS. I then like to rub
some dielectric grease on the plug's seal skirt.

WD40 will even work in a pinch, it just doesn't last long.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

paul wrote:
> 93 YJ 4.0 automatic
>
> Are there any recommended procedures for checking for a spark problem?
>
> Vacuum leaks?
>
> tranny shop tells me that the transmission is good and that I either have a
> spark or vacuum problem --- I feel like I'm getting the run around but want
> to explore all possibilities before calling the guy a thief.
>
> tia
> paul
>
>

Re: 93 YJ spark / vacuum problem?
 

It started awhile back with slow acceleration from a dead stop then at
freeway speeds if I tried to pass the RPM's would shoot up to 3500 and there
would be no drive train response.

Took it to a transmission shop they did a 'rebuild' of the tranny - I got
it back still had the same problem but now it was more noticeable that it
was not shifting properly from 1st to 2nd - rpm's increased - no shift
unless I let off on the throttle. Took it back again, and was told they
tried adjusting the shift points both earlier and later with no favorable
results and that they feel that there is a spark/ vacuum issue.

Now the symptoms are the same except at freeway speed it will no longer
kick up the rpm's - just plods along at 60 mph.

If I shift to neutral I can get an rpm response on the freeway but not while
in gear.

?????



"Earle Horton" <gracioso@latino.usa> wrote in message
news:Fo2dnVnd3Ok50rvbnZ2dnUVZ_j2dnZ2d@comcast.com. ..
> What is the problem? Describe what is/what is not happening with the
> vehicle. I take it your transmission isn't shifting right, or has some
> other transmission-related problem. If there were a spark problem, you
> would notice the engine running rough. It would be odd for spark, or lack
> thereof, to only affect the transmission.
>
> Earle
>
> "paul" <SPAMpdrapeau@wi.rr.com> wrote in message
> news:46264e74$0$21074$4c368faf@roadrunner.com...
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
> a
>> spark or vacuum problem --- I feel like I'm getting the run around but
> want
>> to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul
>>
>>
>
>

Re: 93 YJ spark / vacuum problem?
 

It started awhile back with slow acceleration from a dead stop then at
freeway speeds if I tried to pass the RPM's would shoot up to 3500 and there
would be no drive train response.

Took it to a transmission shop they did a 'rebuild' of the tranny - I got
it back still had the same problem but now it was more noticeable that it
was not shifting properly from 1st to 2nd - rpm's increased - no shift
unless I let off on the throttle. Took it back again, and was told they
tried adjusting the shift points both earlier and later with no favorable
results and that they feel that there is a spark/ vacuum issue.

Now the symptoms are the same except at freeway speed it will no longer
kick up the rpm's - just plods along at 60 mph.

If I shift to neutral I can get an rpm response on the freeway but not while
in gear.

?????



"Earle Horton" <gracioso@latino.usa> wrote in message
news:Fo2dnVnd3Ok50rvbnZ2dnUVZ_j2dnZ2d@comcast.com. ..
> What is the problem? Describe what is/what is not happening with the
> vehicle. I take it your transmission isn't shifting right, or has some
> other transmission-related problem. If there were a spark problem, you
> would notice the engine running rough. It would be odd for spark, or lack
> thereof, to only affect the transmission.
>
> Earle
>
> "paul" <SPAMpdrapeau@wi.rr.com> wrote in message
> news:46264e74$0$21074$4c368faf@roadrunner.com...
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
> a
>> spark or vacuum problem --- I feel like I'm getting the run around but
> want
>> to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul
>>
>>
>
>

Re: 93 YJ spark / vacuum problem?
 

It started awhile back with slow acceleration from a dead stop then at
freeway speeds if I tried to pass the RPM's would shoot up to 3500 and there
would be no drive train response.

Took it to a transmission shop they did a 'rebuild' of the tranny - I got
it back still had the same problem but now it was more noticeable that it
was not shifting properly from 1st to 2nd - rpm's increased - no shift
unless I let off on the throttle. Took it back again, and was told they
tried adjusting the shift points both earlier and later with no favorable
results and that they feel that there is a spark/ vacuum issue.

Now the symptoms are the same except at freeway speed it will no longer
kick up the rpm's - just plods along at 60 mph.

If I shift to neutral I can get an rpm response on the freeway but not while
in gear.

?????



"Earle Horton" <gracioso@latino.usa> wrote in message
news:Fo2dnVnd3Ok50rvbnZ2dnUVZ_j2dnZ2d@comcast.com. ..
> What is the problem? Describe what is/what is not happening with the
> vehicle. I take it your transmission isn't shifting right, or has some
> other transmission-related problem. If there were a spark problem, you
> would notice the engine running rough. It would be odd for spark, or lack
> thereof, to only affect the transmission.
>
> Earle
>
> "paul" <SPAMpdrapeau@wi.rr.com> wrote in message
> news:46264e74$0$21074$4c368faf@roadrunner.com...
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
> a
>> spark or vacuum problem --- I feel like I'm getting the run around but
> want
>> to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul
>>
>>
>
>

Re: 93 YJ spark / vacuum problem?
 

It started awhile back with slow acceleration from a dead stop then at
freeway speeds if I tried to pass the RPM's would shoot up to 3500 and there
would be no drive train response.

Took it to a transmission shop they did a 'rebuild' of the tranny - I got
it back still had the same problem but now it was more noticeable that it
was not shifting properly from 1st to 2nd - rpm's increased - no shift
unless I let off on the throttle. Took it back again, and was told they
tried adjusting the shift points both earlier and later with no favorable
results and that they feel that there is a spark/ vacuum issue.

Now the symptoms are the same except at freeway speed it will no longer
kick up the rpm's - just plods along at 60 mph.

If I shift to neutral I can get an rpm response on the freeway but not while
in gear.

?????



"Earle Horton" <gracioso@latino.usa> wrote in message
news:Fo2dnVnd3Ok50rvbnZ2dnUVZ_j2dnZ2d@comcast.com. ..
> What is the problem? Describe what is/what is not happening with the
> vehicle. I take it your transmission isn't shifting right, or has some
> other transmission-related problem. If there were a spark problem, you
> would notice the engine running rough. It would be odd for spark, or lack
> thereof, to only affect the transmission.
>
> Earle
>
> "paul" <SPAMpdrapeau@wi.rr.com> wrote in message
> news:46264e74$0$21074$4c368faf@roadrunner.com...
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
> a
>> spark or vacuum problem --- I feel like I'm getting the run around but
> want
>> to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul
>>
>>
>
>

Re: 93 YJ spark / vacuum problem?
 

I'll give that a try this weekend,,, thanks


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:462656f9$0$29984$9a6e19ea@unlimited.newshosti ng.com...
> The throttle position sensor is notorious forgetting a bad connection. It
> controls the shift points on the tranny.
>
> I recommend an electronic spray contact cleaner on it, well all of the
> computer sensor plugs for that matter like like CPS. I then like to rub
> some dielectric grease on the plug's seal skirt.
>
> WD40 will even work in a pinch, it just doesn't last long.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> paul wrote:
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
>> a spark or vacuum problem --- I feel like I'm getting the run around but
>> want to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul

Re: 93 YJ spark / vacuum problem?
 

I'll give that a try this weekend,,, thanks


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:462656f9$0$29984$9a6e19ea@unlimited.newshosti ng.com...
> The throttle position sensor is notorious forgetting a bad connection. It
> controls the shift points on the tranny.
>
> I recommend an electronic spray contact cleaner on it, well all of the
> computer sensor plugs for that matter like like CPS. I then like to rub
> some dielectric grease on the plug's seal skirt.
>
> WD40 will even work in a pinch, it just doesn't last long.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> paul wrote:
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
>> a spark or vacuum problem --- I feel like I'm getting the run around but
>> want to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul

Re: 93 YJ spark / vacuum problem?
 

I'll give that a try this weekend,,, thanks


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:462656f9$0$29984$9a6e19ea@unlimited.newshosti ng.com...
> The throttle position sensor is notorious forgetting a bad connection. It
> controls the shift points on the tranny.
>
> I recommend an electronic spray contact cleaner on it, well all of the
> computer sensor plugs for that matter like like CPS. I then like to rub
> some dielectric grease on the plug's seal skirt.
>
> WD40 will even work in a pinch, it just doesn't last long.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> paul wrote:
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
>> a spark or vacuum problem --- I feel like I'm getting the run around but
>> want to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul

Re: 93 YJ spark / vacuum problem?
 

I'll give that a try this weekend,,, thanks


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:462656f9$0$29984$9a6e19ea@unlimited.newshosti ng.com...
> The throttle position sensor is notorious forgetting a bad connection. It
> controls the shift points on the tranny.
>
> I recommend an electronic spray contact cleaner on it, well all of the
> computer sensor plugs for that matter like like CPS. I then like to rub
> some dielectric grease on the plug's seal skirt.
>
> WD40 will even work in a pinch, it just doesn't last long.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> paul wrote:
>> 93 YJ 4.0 automatic
>>
>> Are there any recommended procedures for checking for a spark problem?
>>
>> Vacuum leaks?
>>
>> tranny shop tells me that the transmission is good and that I either have
>> a spark or vacuum problem --- I feel like I'm getting the run around but
>> want to explore all possibilities before calling the guy a thief.
>>
>> tia
>> paul

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> It started awhile back with slow acceleration from a dead stop then at
> freeway speeds if I tried to pass the RPM's would shoot up to 3500
> and there would be no drive train response.
>
> Took it to a transmission shop they did a 'rebuild' of the tranny - I
> got it back still had the same problem but now it was more noticeable
> that it was not shifting properly from 1st to 2nd - rpm's increased
> - no shift unless I let off on the throttle. Took it back again, and
> was told they tried adjusting the shift points both earlier and later
> with no favorable results and that they feel that there is a spark/
> vacuum issue.
> Now the symptoms are the same except at freeway speed it will no
> longer kick up the rpm's - just plods along at 60 mph.
>
> If I shift to neutral I can get an rpm response on the freeway but
> not while in gear.

Is the kickdown cable properly adjusted?

It's on the side of the trottle body and runs down to the transmission.
The adjustment is a pushbutton thingy on the holddown. You move the
cable end further away (more tension) to tighten up the shift points.

You can test spark with a gap tester. How old is your ignition system?
Plugs could be bad, the wires could be arcing or worn out, bad cap or rotor
will make for weak spark, and the coil is well known for going bad. Best
replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
but this has a short resistor lead and a better matched coil.


--
DougW

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> It started awhile back with slow acceleration from a dead stop then at
> freeway speeds if I tried to pass the RPM's would shoot up to 3500
> and there would be no drive train response.
>
> Took it to a transmission shop they did a 'rebuild' of the tranny - I
> got it back still had the same problem but now it was more noticeable
> that it was not shifting properly from 1st to 2nd - rpm's increased
> - no shift unless I let off on the throttle. Took it back again, and
> was told they tried adjusting the shift points both earlier and later
> with no favorable results and that they feel that there is a spark/
> vacuum issue.
> Now the symptoms are the same except at freeway speed it will no
> longer kick up the rpm's - just plods along at 60 mph.
>
> If I shift to neutral I can get an rpm response on the freeway but
> not while in gear.

Is the kickdown cable properly adjusted?

It's on the side of the trottle body and runs down to the transmission.
The adjustment is a pushbutton thingy on the holddown. You move the
cable end further away (more tension) to tighten up the shift points.

You can test spark with a gap tester. How old is your ignition system?
Plugs could be bad, the wires could be arcing or worn out, bad cap or rotor
will make for weak spark, and the coil is well known for going bad. Best
replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
but this has a short resistor lead and a better matched coil.


--
DougW

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> It started awhile back with slow acceleration from a dead stop then at
> freeway speeds if I tried to pass the RPM's would shoot up to 3500
> and there would be no drive train response.
>
> Took it to a transmission shop they did a 'rebuild' of the tranny - I
> got it back still had the same problem but now it was more noticeable
> that it was not shifting properly from 1st to 2nd - rpm's increased
> - no shift unless I let off on the throttle. Took it back again, and
> was told they tried adjusting the shift points both earlier and later
> with no favorable results and that they feel that there is a spark/
> vacuum issue.
> Now the symptoms are the same except at freeway speed it will no
> longer kick up the rpm's - just plods along at 60 mph.
>
> If I shift to neutral I can get an rpm response on the freeway but
> not while in gear.

Is the kickdown cable properly adjusted?

It's on the side of the trottle body and runs down to the transmission.
The adjustment is a pushbutton thingy on the holddown. You move the
cable end further away (more tension) to tighten up the shift points.

You can test spark with a gap tester. How old is your ignition system?
Plugs could be bad, the wires could be arcing or worn out, bad cap or rotor
will make for weak spark, and the coil is well known for going bad. Best
replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
but this has a short resistor lead and a better matched coil.


--
DougW

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> It started awhile back with slow acceleration from a dead stop then at
> freeway speeds if I tried to pass the RPM's would shoot up to 3500
> and there would be no drive train response.
>
> Took it to a transmission shop they did a 'rebuild' of the tranny - I
> got it back still had the same problem but now it was more noticeable
> that it was not shifting properly from 1st to 2nd - rpm's increased
> - no shift unless I let off on the throttle. Took it back again, and
> was told they tried adjusting the shift points both earlier and later
> with no favorable results and that they feel that there is a spark/
> vacuum issue.
> Now the symptoms are the same except at freeway speed it will no
> longer kick up the rpm's - just plods along at 60 mph.
>
> If I shift to neutral I can get an rpm response on the freeway but
> not while in gear.

Is the kickdown cable properly adjusted?

It's on the side of the trottle body and runs down to the transmission.
The adjustment is a pushbutton thingy on the holddown. You move the
cable end further away (more tension) to tighten up the shift points.

You can test spark with a gap tester. How old is your ignition system?
Plugs could be bad, the wires could be arcing or worn out, bad cap or rotor
will make for weak spark, and the coil is well known for going bad. Best
replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
but this has a short resistor lead and a better matched coil.


--
DougW

Re: 93 YJ spark / vacuum problem?
 

Doug,
I did adjust as per your earlier recommendation without any success.

Ignition (plugs, wires and cap) was done 2.5 years ago.
What is a gap tester and how does it function?

Can I test the coil with a meter?

thanks much,
paul

I should add to my description below that the jeep idles at 500 rpm and is
smooth - although at infrequent times it will 'surge' to 1000 rpm and the
jeep will lurch a little if my foot is not firm on the brake.

"DougW" <post.replies@invalid.address> wrote in message
news:1FRVh.119737$nh4.51627@newsfe20.lga...
> paul wrote:
>> It started awhile back with slow acceleration from a dead stop then at
>> freeway speeds if I tried to pass the RPM's would shoot up to 3500
>> and there would be no drive train response.
>>
>> Took it to a transmission shop they did a 'rebuild' of the tranny - I
>> got it back still had the same problem but now it was more noticeable
>> that it was not shifting properly from 1st to 2nd - rpm's increased
>> - no shift unless I let off on the throttle. Took it back again, and
>> was told they tried adjusting the shift points both earlier and later
>> with no favorable results and that they feel that there is a spark/
>> vacuum issue.
>> Now the symptoms are the same except at freeway speed it will no
>> longer kick up the rpm's - just plods along at 60 mph.
>>
>> If I shift to neutral I can get an rpm response on the freeway but
>> not while in gear.
>
> Is the kickdown cable properly adjusted?
>
> It's on the side of the trottle body and runs down to the transmission.
> The adjustment is a pushbutton thingy on the holddown. You move the
> cable end further away (more tension) to tighten up the shift points.
>
> You can test spark with a gap tester. How old is your ignition system?
> Plugs could be bad, the wires could be arcing or worn out, bad cap or
> rotor
> will make for weak spark, and the coil is well known for going bad. Best
> replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
> but this has a short resistor lead and a better matched coil.
>
>
> --
> DougW
>

Re: 93 YJ spark / vacuum problem?
 

Doug,
I did adjust as per your earlier recommendation without any success.

Ignition (plugs, wires and cap) was done 2.5 years ago.
What is a gap tester and how does it function?

Can I test the coil with a meter?

thanks much,
paul

I should add to my description below that the jeep idles at 500 rpm and is
smooth - although at infrequent times it will 'surge' to 1000 rpm and the
jeep will lurch a little if my foot is not firm on the brake.

"DougW" <post.replies@invalid.address> wrote in message
news:1FRVh.119737$nh4.51627@newsfe20.lga...
> paul wrote:
>> It started awhile back with slow acceleration from a dead stop then at
>> freeway speeds if I tried to pass the RPM's would shoot up to 3500
>> and there would be no drive train response.
>>
>> Took it to a transmission shop they did a 'rebuild' of the tranny - I
>> got it back still had the same problem but now it was more noticeable
>> that it was not shifting properly from 1st to 2nd - rpm's increased
>> - no shift unless I let off on the throttle. Took it back again, and
>> was told they tried adjusting the shift points both earlier and later
>> with no favorable results and that they feel that there is a spark/
>> vacuum issue.
>> Now the symptoms are the same except at freeway speed it will no
>> longer kick up the rpm's - just plods along at 60 mph.
>>
>> If I shift to neutral I can get an rpm response on the freeway but
>> not while in gear.
>
> Is the kickdown cable properly adjusted?
>
> It's on the side of the trottle body and runs down to the transmission.
> The adjustment is a pushbutton thingy on the holddown. You move the
> cable end further away (more tension) to tighten up the shift points.
>
> You can test spark with a gap tester. How old is your ignition system?
> Plugs could be bad, the wires could be arcing or worn out, bad cap or
> rotor
> will make for weak spark, and the coil is well known for going bad. Best
> replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
> but this has a short resistor lead and a better matched coil.
>
>
> --
> DougW
>

Re: 93 YJ spark / vacuum problem?
 

Doug,
I did adjust as per your earlier recommendation without any success.

Ignition (plugs, wires and cap) was done 2.5 years ago.
What is a gap tester and how does it function?

Can I test the coil with a meter?

thanks much,
paul

I should add to my description below that the jeep idles at 500 rpm and is
smooth - although at infrequent times it will 'surge' to 1000 rpm and the
jeep will lurch a little if my foot is not firm on the brake.

"DougW" <post.replies@invalid.address> wrote in message
news:1FRVh.119737$nh4.51627@newsfe20.lga...
> paul wrote:
>> It started awhile back with slow acceleration from a dead stop then at
>> freeway speeds if I tried to pass the RPM's would shoot up to 3500
>> and there would be no drive train response.
>>
>> Took it to a transmission shop they did a 'rebuild' of the tranny - I
>> got it back still had the same problem but now it was more noticeable
>> that it was not shifting properly from 1st to 2nd - rpm's increased
>> - no shift unless I let off on the throttle. Took it back again, and
>> was told they tried adjusting the shift points both earlier and later
>> with no favorable results and that they feel that there is a spark/
>> vacuum issue.
>> Now the symptoms are the same except at freeway speed it will no
>> longer kick up the rpm's - just plods along at 60 mph.
>>
>> If I shift to neutral I can get an rpm response on the freeway but
>> not while in gear.
>
> Is the kickdown cable properly adjusted?
>
> It's on the side of the trottle body and runs down to the transmission.
> The adjustment is a pushbutton thingy on the holddown. You move the
> cable end further away (more tension) to tighten up the shift points.
>
> You can test spark with a gap tester. How old is your ignition system?
> Plugs could be bad, the wires could be arcing or worn out, bad cap or
> rotor
> will make for weak spark, and the coil is well known for going bad. Best
> replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
> but this has a short resistor lead and a better matched coil.
>
>
> --
> DougW
>

Re: 93 YJ spark / vacuum problem?
 

Doug,
I did adjust as per your earlier recommendation without any success.

Ignition (plugs, wires and cap) was done 2.5 years ago.
What is a gap tester and how does it function?

Can I test the coil with a meter?

thanks much,
paul

I should add to my description below that the jeep idles at 500 rpm and is
smooth - although at infrequent times it will 'surge' to 1000 rpm and the
jeep will lurch a little if my foot is not firm on the brake.

"DougW" <post.replies@invalid.address> wrote in message
news:1FRVh.119737$nh4.51627@newsfe20.lga...
> paul wrote:
>> It started awhile back with slow acceleration from a dead stop then at
>> freeway speeds if I tried to pass the RPM's would shoot up to 3500
>> and there would be no drive train response.
>>
>> Took it to a transmission shop they did a 'rebuild' of the tranny - I
>> got it back still had the same problem but now it was more noticeable
>> that it was not shifting properly from 1st to 2nd - rpm's increased
>> - no shift unless I let off on the throttle. Took it back again, and
>> was told they tried adjusting the shift points both earlier and later
>> with no favorable results and that they feel that there is a spark/
>> vacuum issue.
>> Now the symptoms are the same except at freeway speed it will no
>> longer kick up the rpm's - just plods along at 60 mph.
>>
>> If I shift to neutral I can get an rpm response on the freeway but
>> not while in gear.
>
> Is the kickdown cable properly adjusted?
>
> It's on the side of the trottle body and runs down to the transmission.
> The adjustment is a pushbutton thingy on the holddown. You move the
> cable end further away (more tension) to tighten up the shift points.
>
> You can test spark with a gap tester. How old is your ignition system?
> Plugs could be bad, the wires could be arcing or worn out, bad cap or
> rotor
> will make for weak spark, and the coil is well known for going bad. Best
> replacement for the coil is a NAPA part ECHIC409 (same as the OEM part)
> but this has a short resistor lead and a better matched coil.
>
>
> --
> DougW
>

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> Doug,
> I did adjust as per your earlier recommendation without any success.
>
> Ignition (plugs, wires and cap) was done 2.5 years ago.
> What is a gap tester and how does it function?

http://www.thetoolwarehouse.net/shop/TTW409.html

Several types, I have these
(this one is better for open engine bays)
http://www.thetoolwarehouse.net/shop/LIS-50850.html
This one works easier.
http://www.thetoolwarehouse.net/shop/TA-23900.html

It puts a known air gap between the coil and ground.
The distance the spark will jump indicates how high the
voltage, and the brightness indicates power.


> Can I test the coil with a meter?

sorta. I've tested quite a few that look good with a
simple resistance check but don't actually work. So much
so that throwing a known good test-coil in there is easier
than piddling with the meter.

--
DougW

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> Doug,
> I did adjust as per your earlier recommendation without any success.
>
> Ignition (plugs, wires and cap) was done 2.5 years ago.
> What is a gap tester and how does it function?

http://www.thetoolwarehouse.net/shop/TTW409.html

Several types, I have these
(this one is better for open engine bays)
http://www.thetoolwarehouse.net/shop/LIS-50850.html
This one works easier.
http://www.thetoolwarehouse.net/shop/TA-23900.html

It puts a known air gap between the coil and ground.
The distance the spark will jump indicates how high the
voltage, and the brightness indicates power.


> Can I test the coil with a meter?

sorta. I've tested quite a few that look good with a
simple resistance check but don't actually work. So much
so that throwing a known good test-coil in there is easier
than piddling with the meter.

--
DougW

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> Doug,
> I did adjust as per your earlier recommendation without any success.
>
> Ignition (plugs, wires and cap) was done 2.5 years ago.
> What is a gap tester and how does it function?

http://www.thetoolwarehouse.net/shop/TTW409.html

Several types, I have these
(this one is better for open engine bays)
http://www.thetoolwarehouse.net/shop/LIS-50850.html
This one works easier.
http://www.thetoolwarehouse.net/shop/TA-23900.html

It puts a known air gap between the coil and ground.
The distance the spark will jump indicates how high the
voltage, and the brightness indicates power.


> Can I test the coil with a meter?

sorta. I've tested quite a few that look good with a
simple resistance check but don't actually work. So much
so that throwing a known good test-coil in there is easier
than piddling with the meter.

--
DougW

Re: 93 YJ spark / vacuum problem?
 

paul wrote:
> Doug,
> I did adjust as per your earlier recommendation without any success.
>
> Ignition (plugs, wires and cap) was done 2.5 years ago.
> What is a gap tester and how does it function?

http://www.thetoolwarehouse.net/shop/TTW409.html

Several types, I have these
(this one is better for open engine bays)
http://www.thetoolwarehouse.net/shop/LIS-50850.html
This one works easier.
http://www.thetoolwarehouse.net/shop/TA-23900.html

It puts a known air gap between the coil and ground.
The distance the spark will jump indicates how high the
voltage, and the brightness indicates power.


> Can I test the coil with a meter?

sorta. I've tested quite a few that look good with a
simple resistance check but don't actually work. So much
so that throwing a known good test-coil in there is easier
than piddling with the meter.

--
DougW