Automatic Choke Adjustment
#21
Guest
Posts: n/a
Re: Automatic Choke Adjustment
On Wed, 14 Jul 2004 14:19:34 UTC Mike Romain <romainm@sympatico.ca>
wrote:
> Will Honea wrote:
> >
> > On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > > We had that issue with out 88 Cherokee 4.0.
> > >
> > > It also would stall at the first or second stop in the morning.
> > >
> > > That was caused by a dirty plug on the TPS or throttle position sensor
> > > on the throttle body.
> > >
> > > These plugs are only low powered computer plugs and the slightest dirt
> > > makes them shaky.
> > >
> > > I used a proper electronic contact cleaner the first time on it and it
> > > lasted a couple years. The second time it went and stayed at high revs
> > > way off road so I used WD40 on it. That has lasted almost a year to and
> > > my wife just mentioned it needs another clean soon.
> >
> > I don't know if the TPS is the real culprit on the 88 (Renix) system
> > or not. No matter what I do mine will still stall after a cold start
> > if I take off down hill and use the engine to hold it going down with
> > my foot off the gas. If I tap the gas just before I stop, all is
> > well; otherwise it will stagger and frequently die when I put the
> > clutch in. I'm about convinced that it's a characteristic of the
> > computer where it's over-correcting for the engine braking and not
> > responding fast enough when it tries to get to an unloaded idle state.
> > If yours is like mine, when it staggers and doesn't die it surges
> > pretty good before settling down. Blasted nuisance, whatever it is.
> >
> > --
> > Will Honea <whonea@codenet.net>
>
> No issues like that on ours.
>
> When I clean the contacts, it purrs like new again for a year or more.
>
> You 'can' use a volt meter and check the TPS out. I think you can also
> ohm it out, but the book test is for volts.
>
> You need the key on and engine off, AC off and you back probe the TPS
> plug with the meter probes looking for volts. Use the center wire and
> either outside wire. One will be a mirror image of the other for
> readings. One side is for the auto tranny.
>
> At the idle setting on the throttle lever, the TPS should read greater
> than .02 volts or 200 ma. One setting says .026 volts for the pre 91
> adjustable ones.
>
> At full throttle, it should read less than 4.8 volts.
>
> The volt rise or drop should also be smooth, not jerky.
>
> Same if you have it unplugged and are using ohms. The rise or drop in
> ohms should be smooth.
Been thru all that. I can almost predict when it's going to stagger
at the bottom of the hill anymore - it seems like it always happens on
a cool morning. Almost never happens when it's hot or actually cold
(like freezing or below) but in that middle ground it's fairly common
for me. I just live with it.
--
Will Honea
wrote:
> Will Honea wrote:
> >
> > On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > > We had that issue with out 88 Cherokee 4.0.
> > >
> > > It also would stall at the first or second stop in the morning.
> > >
> > > That was caused by a dirty plug on the TPS or throttle position sensor
> > > on the throttle body.
> > >
> > > These plugs are only low powered computer plugs and the slightest dirt
> > > makes them shaky.
> > >
> > > I used a proper electronic contact cleaner the first time on it and it
> > > lasted a couple years. The second time it went and stayed at high revs
> > > way off road so I used WD40 on it. That has lasted almost a year to and
> > > my wife just mentioned it needs another clean soon.
> >
> > I don't know if the TPS is the real culprit on the 88 (Renix) system
> > or not. No matter what I do mine will still stall after a cold start
> > if I take off down hill and use the engine to hold it going down with
> > my foot off the gas. If I tap the gas just before I stop, all is
> > well; otherwise it will stagger and frequently die when I put the
> > clutch in. I'm about convinced that it's a characteristic of the
> > computer where it's over-correcting for the engine braking and not
> > responding fast enough when it tries to get to an unloaded idle state.
> > If yours is like mine, when it staggers and doesn't die it surges
> > pretty good before settling down. Blasted nuisance, whatever it is.
> >
> > --
> > Will Honea <whonea@codenet.net>
>
> No issues like that on ours.
>
> When I clean the contacts, it purrs like new again for a year or more.
>
> You 'can' use a volt meter and check the TPS out. I think you can also
> ohm it out, but the book test is for volts.
>
> You need the key on and engine off, AC off and you back probe the TPS
> plug with the meter probes looking for volts. Use the center wire and
> either outside wire. One will be a mirror image of the other for
> readings. One side is for the auto tranny.
>
> At the idle setting on the throttle lever, the TPS should read greater
> than .02 volts or 200 ma. One setting says .026 volts for the pre 91
> adjustable ones.
>
> At full throttle, it should read less than 4.8 volts.
>
> The volt rise or drop should also be smooth, not jerky.
>
> Same if you have it unplugged and are using ohms. The rise or drop in
> ohms should be smooth.
Been thru all that. I can almost predict when it's going to stagger
at the bottom of the hill anymore - it seems like it always happens on
a cool morning. Almost never happens when it's hot or actually cold
(like freezing or below) but in that middle ground it's fairly common
for me. I just live with it.
--
Will Honea
#22
Guest
Posts: n/a
Re: Automatic Choke Adjustment
I think all cars have their idiosyncrasies. And you've learned to
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
#23
Guest
Posts: n/a
Re: Automatic Choke Adjustment
I think all cars have their idiosyncrasies. And you've learned to
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
#24
Guest
Posts: n/a
Re: Automatic Choke Adjustment
I think all cars have their idiosyncrasies. And you've learned to
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
#25
Guest
Posts: n/a
Re: Automatic Choke Adjustment
I think all cars have their idiosyncrasies. And you've learned to
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
live with yours by goosing it just before you neutral the engine
braking. I don't know you'd program a computer to know you were about to
have the engine idle after being forced rev faster than it's sensors
could control.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Will Honea wrote:
>
> Been thru all that. I can almost predict when it's going to stagger
> at the bottom of the hill anymore - it seems like it always happens on
> a cool morning. Almost never happens when it's hot or actually cold
> (like freezing or below) but in that middle ground it's fairly common
> for me. I just live with it.
>
> --
> Will Honea
#26
Guest
Posts: n/a
Re: Automatic Choke Adjustment
Thanks,
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
#27
Guest
Posts: n/a
Re: Automatic Choke Adjustment
Thanks,
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
#28
Guest
Posts: n/a
Re: Automatic Choke Adjustment
Thanks,
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
#29
Guest
Posts: n/a
Re: Automatic Choke Adjustment
Thanks,
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
I have used WD40 and also cleaned the throttle body,
http://members.***.net/wilsond/tb/tb.html
I noticed that my throttle body is not exactly the same as described above
link.
It sure was dirty, and I did my best, it looked much nicer when I was
finished, but right after the work, it started with high rpm again.
So I guess it is another thing I have to get used to.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F3EC51.75A6FC4B@sympatico.ca...
> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Fam_Pettersson wrote:
> >
> > Jeep Cherokee Laredo 88mod, 6syl.Automatic 4L
> > Somethimes, even if the car is hot, it start with a very high RPM, and
it
> > stays there until I kick the gas pedal down.
> > Could this have something to do with the choke ? and what should I check
?
> > Geir R.Pettersson
#30
Guest
Posts: n/a
Re: Automatic Choke Adjustment
Thanks, I will try to measure later today.
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F540F6.90ED3695@sympatico.ca...
> Will Honea wrote:
> >
> > On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > > We had that issue with out 88 Cherokee 4.0.
> > >
> > > It also would stall at the first or second stop in the morning.
> > >
> > > That was caused by a dirty plug on the TPS or throttle position sensor
> > > on the throttle body.
> > >
> > > These plugs are only low powered computer plugs and the slightest dirt
> > > makes them shaky.
> > >
> > > I used a proper electronic contact cleaner the first time on it and it
> > > lasted a couple years. The second time it went and stayed at high
revs
> > > way off road so I used WD40 on it. That has lasted almost a year to
and
> > > my wife just mentioned it needs another clean soon.
> >
> > I don't know if the TPS is the real culprit on the 88 (Renix) system
> > or not. No matter what I do mine will still stall after a cold start
> > if I take off down hill and use the engine to hold it going down with
> > my foot off the gas. If I tap the gas just before I stop, all is
> > well; otherwise it will stagger and frequently die when I put the
> > clutch in. I'm about convinced that it's a characteristic of the
> > computer where it's over-correcting for the engine braking and not
> > responding fast enough when it tries to get to an unloaded idle state.
> > If yours is like mine, when it staggers and doesn't die it surges
> > pretty good before settling down. Blasted nuisance, whatever it is.
> >
> > --
> > Will Honea <whonea@codenet.net>
>
> No issues like that on ours.
>
> When I clean the contacts, it purrs like new again for a year or more.
>
> You 'can' use a volt meter and check the TPS out. I think you can also
> ohm it out, but the book test is for volts.
>
> You need the key on and engine off, AC off and you back probe the TPS
> plug with the meter probes looking for volts. Use the center wire and
> either outside wire. One will be a mirror image of the other for
> readings. One side is for the auto tranny.
>
> At the idle setting on the throttle lever, the TPS should read greater
> than .02 volts or 200 ma. One setting says .026 volts for the pre 91
> adjustable ones.
>
> At full throttle, it should read less than 4.8 volts.
>
> The volt rise or drop should also be smooth, not jerky.
>
> Same if you have it unplugged and are using ohms. The rise or drop in
> ohms should be smooth.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
--
Best Regards
Geir R.Pettersson
grp.arctic@heating.no
http://www.arctic-heating.com
"Mike Romain" <romainm@sympatico.ca> skrev i melding
news:40F540F6.90ED3695@sympatico.ca...
> Will Honea wrote:
> >
> > On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > > We had that issue with out 88 Cherokee 4.0.
> > >
> > > It also would stall at the first or second stop in the morning.
> > >
> > > That was caused by a dirty plug on the TPS or throttle position sensor
> > > on the throttle body.
> > >
> > > These plugs are only low powered computer plugs and the slightest dirt
> > > makes them shaky.
> > >
> > > I used a proper electronic contact cleaner the first time on it and it
> > > lasted a couple years. The second time it went and stayed at high
revs
> > > way off road so I used WD40 on it. That has lasted almost a year to
and
> > > my wife just mentioned it needs another clean soon.
> >
> > I don't know if the TPS is the real culprit on the 88 (Renix) system
> > or not. No matter what I do mine will still stall after a cold start
> > if I take off down hill and use the engine to hold it going down with
> > my foot off the gas. If I tap the gas just before I stop, all is
> > well; otherwise it will stagger and frequently die when I put the
> > clutch in. I'm about convinced that it's a characteristic of the
> > computer where it's over-correcting for the engine braking and not
> > responding fast enough when it tries to get to an unloaded idle state.
> > If yours is like mine, when it staggers and doesn't die it surges
> > pretty good before settling down. Blasted nuisance, whatever it is.
> >
> > --
> > Will Honea <whonea@codenet.net>
>
> No issues like that on ours.
>
> When I clean the contacts, it purrs like new again for a year or more.
>
> You 'can' use a volt meter and check the TPS out. I think you can also
> ohm it out, but the book test is for volts.
>
> You need the key on and engine off, AC off and you back probe the TPS
> plug with the meter probes looking for volts. Use the center wire and
> either outside wire. One will be a mirror image of the other for
> readings. One side is for the auto tranny.
>
> At the idle setting on the throttle lever, the TPS should read greater
> than .02 volts or 200 ma. One setting says .026 volts for the pre 91
> adjustable ones.
>
> At full throttle, it should read less than 4.8 volts.
>
> The volt rise or drop should also be smooth, not jerky.
>
> Same if you have it unplugged and are using ohms. The rise or drop in
> ohms should be smooth.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's