Ping revisited
05-05-2004, 01:38 AM
#31
Guest
Posts: n/a
Re: Ping revisited
In message <BCBB9D5B.33822%nospam@thanksImFull.spam>, "KurtS" wrote:
>Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
>have some more vac issue hunting. tnx Bill.
IF you're setting the timing at idle speed, you're way too advanced.
Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
switch assy electrical connector unplugged, and engine running at 1600 RPM.
Could also be your knock sensor has gone south.
>
>> From: L.W.(ßill) ------ III <----------@***.net>
>> Organization: Not@Home
>> Newsgroups: rec.autos.makers.jeep+******
>> Date: Sun, 02 May 2004 12:31:21 -0700
>> Subject: Re: Ping revisited
>>
>> You're too far advanced, when you stick your foot in it your vacuum
>> advance has less vacuum therefore retards the spark to a place it can
>> burn the gas.
>Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
>have some more vac issue hunting. tnx Bill.
IF you're setting the timing at idle speed, you're way too advanced.
Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
switch assy electrical connector unplugged, and engine running at 1600 RPM.
Could also be your knock sensor has gone south.
>
>> From: L.W.(ßill) ------ III <----------@***.net>
>> Organization: Not@Home
>> Newsgroups: rec.autos.makers.jeep+******
>> Date: Sun, 02 May 2004 12:31:21 -0700
>> Subject: Re: Ping revisited
>>
>> You're too far advanced, when you stick your foot in it your vacuum
>> advance has less vacuum therefore retards the spark to a place it can
>> burn the gas.
05-05-2004, 01:38 AM
#32
Guest
Posts: n/a
Re: Ping revisited
In message <BCBB9D5B.33822%nospam@thanksImFull.spam>, "KurtS" wrote:
>Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
>have some more vac issue hunting. tnx Bill.
IF you're setting the timing at idle speed, you're way too advanced.
Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
switch assy electrical connector unplugged, and engine running at 1600 RPM.
Could also be your knock sensor has gone south.
>
>> From: L.W.(ßill) ------ III <----------@***.net>
>> Organization: Not@Home
>> Newsgroups: rec.autos.makers.jeep+******
>> Date: Sun, 02 May 2004 12:31:21 -0700
>> Subject: Re: Ping revisited
>>
>> You're too far advanced, when you stick your foot in it your vacuum
>> advance has less vacuum therefore retards the spark to a place it can
>> burn the gas.
>Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
>have some more vac issue hunting. tnx Bill.
IF you're setting the timing at idle speed, you're way too advanced.
Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
switch assy electrical connector unplugged, and engine running at 1600 RPM.
Could also be your knock sensor has gone south.
>
>> From: L.W.(ßill) ------ III <----------@***.net>
>> Organization: Not@Home
>> Newsgroups: rec.autos.makers.jeep+******
>> Date: Sun, 02 May 2004 12:31:21 -0700
>> Subject: Re: Ping revisited
>>
>> You're too far advanced, when you stick your foot in it your vacuum
>> advance has less vacuum therefore retards the spark to a place it can
>> burn the gas.
05-05-2004, 01:38 AM
#33
Guest
Posts: n/a
Re: Ping revisited
In message <BCBB9D5B.33822%nospam@thanksImFull.spam>, "KurtS" wrote:
>Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
>have some more vac issue hunting. tnx Bill.
IF you're setting the timing at idle speed, you're way too advanced.
Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
switch assy electrical connector unplugged, and engine running at 1600 RPM.
Could also be your knock sensor has gone south.
>
>> From: L.W.(ßill) ------ III <----------@***.net>
>> Organization: Not@Home
>> Newsgroups: rec.autos.makers.jeep+******
>> Date: Sun, 02 May 2004 12:31:21 -0700
>> Subject: Re: Ping revisited
>>
>> You're too far advanced, when you stick your foot in it your vacuum
>> advance has less vacuum therefore retards the spark to a place it can
>> burn the gas.
>Hrm. When I back it off from 9 deg BTDC, idle falls to crap. Looks like I
>have some more vac issue hunting. tnx Bill.
IF you're setting the timing at idle speed, you're way too advanced.
Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
switch assy electrical connector unplugged, and engine running at 1600 RPM.
Could also be your knock sensor has gone south.
>
>> From: L.W.(ßill) ------ III <----------@***.net>
>> Organization: Not@Home
>> Newsgroups: rec.autos.makers.jeep+******
>> Date: Sun, 02 May 2004 12:31:21 -0700
>> Subject: Re: Ping revisited
>>
>> You're too far advanced, when you stick your foot in it your vacuum
>> advance has less vacuum therefore retards the spark to a place it can
>> burn the gas.
05-31-2004, 12:14 PM
#34
Guest
Posts: n/a
Re: Ping revisited
Sorry for taking so long to get back into the conversation I started. Life
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
05-31-2004, 12:14 PM
#35
Guest
Posts: n/a
Re: Ping revisited
Sorry for taking so long to get back into the conversation I started. Life
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
05-31-2004, 12:14 PM
#36
Guest
Posts: n/a
Re: Ping revisited
Sorry for taking so long to get back into the conversation I started. Life
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
05-31-2004, 12:14 PM
#37
Guest
Posts: n/a
Re: Ping revisited
Sorry for taking so long to get back into the conversation I started. Life
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
is busy right now...
The knock sensor was my next guess. I actually had time to really dig into
the thing this weekend and found that the shop had a really screwy idea
about proper vac line reconnection, even with the diagram I gave them before
the work started. I found the distributor hooked up to ported vacuum and the
manifold vac nipple wide open. A couple of others were just hanging loose.
Sheesh. Odd that it ran so smoothly for the first 1000 miles.
I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
things go from here.
Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
the time at cruise - only when I goosed it a *little*. I'd give it more
pedal and the knock disappeared. Never pinged on hills or hard acceleration,
just most frequent in the pedal range that was *just* past where cruising
speed sits.
Someone mentioned jet size as a possible problem. I didn't realize Carter
BBDs have optional sizes available. Who sells them? I thought I'd check it
out if I end up tearing the carb apart.
> From: bllsht <nospam@invaliddot.net>
> Reply-To: nospam@dot.net
> Newsgroups: rec.autos.makers.jeep+******
> Date: Tue, 04 May 2004 22:38:05 -0700
> Subject: Re: Ping revisited
>
> IF you're setting the timing at idle speed, you're way too advanced.
>
> Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> switch assy electrical connector unplugged, and engine running at 1600 RPM.
>
> Could also be your knock sensor has gone south.
05-31-2004, 01:51 PM
#38
Guest
Posts: n/a
Re: Ping revisited
You could maybe have had the timing not advancing right from the open
port. Have you tried it with the vacuum fixed up?
You are not describing a timing ping though. Pinging or spark knock
happens under load, the more load the more knock. It is the gas pre
igniting in the cylinders.
Having a 'rattle' or knock when you get lightly on the pedal is a loose
part, loose exhaust, loose something. A loose rod bearing cap can act
like that.
My stethoscope recommendation still stands....
The carter does have an adjustment inside for the gas metering rods. I
find when the are not right, the acceleration doesn't match up with the
gas pedal. Open too much and the best acceleration is at say 3/4 of the
way down on the pedal. Not enough and you don't get full power at full
throttle.
Mike
KurtS wrote:
>
> Sorry for taking so long to get back into the conversation I started. Life
> is busy right now...
>
> The knock sensor was my next guess. I actually had time to really dig into
> the thing this weekend and found that the shop had a really screwy idea
> about proper vac line reconnection, even with the diagram I gave them before
> the work started. I found the distributor hooked up to ported vacuum and the
> manifold vac nipple wide open. A couple of others were just hanging loose.
> Sheesh. Odd that it ran so smoothly for the first 1000 miles.
>
> I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
> things go from here.
>
> Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
> the time at cruise - only when I goosed it a *little*. I'd give it more
> pedal and the knock disappeared. Never pinged on hills or hard acceleration,
> just most frequent in the pedal range that was *just* past where cruising
> speed sits.
>
> Someone mentioned jet size as a possible problem. I didn't realize Carter
> BBDs have optional sizes available. Who sells them? I thought I'd check it
> out if I end up tearing the carb apart.
>
> > From: bllsht <nospam@invaliddot.net>
> > Reply-To: nospam@dot.net
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Tue, 04 May 2004 22:38:05 -0700
> > Subject: Re: Ping revisited
> >
> > IF you're setting the timing at idle speed, you're way too advanced.
> >
> > Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> > switch assy electrical connector unplugged, and engine running at 1600 RPM.
> >
> > Could also be your knock sensor has gone south.
port. Have you tried it with the vacuum fixed up?
You are not describing a timing ping though. Pinging or spark knock
happens under load, the more load the more knock. It is the gas pre
igniting in the cylinders.
Having a 'rattle' or knock when you get lightly on the pedal is a loose
part, loose exhaust, loose something. A loose rod bearing cap can act
like that.
My stethoscope recommendation still stands....
The carter does have an adjustment inside for the gas metering rods. I
find when the are not right, the acceleration doesn't match up with the
gas pedal. Open too much and the best acceleration is at say 3/4 of the
way down on the pedal. Not enough and you don't get full power at full
throttle.
Mike
KurtS wrote:
>
> Sorry for taking so long to get back into the conversation I started. Life
> is busy right now...
>
> The knock sensor was my next guess. I actually had time to really dig into
> the thing this weekend and found that the shop had a really screwy idea
> about proper vac line reconnection, even with the diagram I gave them before
> the work started. I found the distributor hooked up to ported vacuum and the
> manifold vac nipple wide open. A couple of others were just hanging loose.
> Sheesh. Odd that it ran so smoothly for the first 1000 miles.
>
> I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
> things go from here.
>
> Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
> the time at cruise - only when I goosed it a *little*. I'd give it more
> pedal and the knock disappeared. Never pinged on hills or hard acceleration,
> just most frequent in the pedal range that was *just* past where cruising
> speed sits.
>
> Someone mentioned jet size as a possible problem. I didn't realize Carter
> BBDs have optional sizes available. Who sells them? I thought I'd check it
> out if I end up tearing the carb apart.
>
> > From: bllsht <nospam@invaliddot.net>
> > Reply-To: nospam@dot.net
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Tue, 04 May 2004 22:38:05 -0700
> > Subject: Re: Ping revisited
> >
> > IF you're setting the timing at idle speed, you're way too advanced.
> >
> > Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> > switch assy electrical connector unplugged, and engine running at 1600 RPM.
> >
> > Could also be your knock sensor has gone south.
05-31-2004, 01:51 PM
#39
Guest
Posts: n/a
Re: Ping revisited
You could maybe have had the timing not advancing right from the open
port. Have you tried it with the vacuum fixed up?
You are not describing a timing ping though. Pinging or spark knock
happens under load, the more load the more knock. It is the gas pre
igniting in the cylinders.
Having a 'rattle' or knock when you get lightly on the pedal is a loose
part, loose exhaust, loose something. A loose rod bearing cap can act
like that.
My stethoscope recommendation still stands....
The carter does have an adjustment inside for the gas metering rods. I
find when the are not right, the acceleration doesn't match up with the
gas pedal. Open too much and the best acceleration is at say 3/4 of the
way down on the pedal. Not enough and you don't get full power at full
throttle.
Mike
KurtS wrote:
>
> Sorry for taking so long to get back into the conversation I started. Life
> is busy right now...
>
> The knock sensor was my next guess. I actually had time to really dig into
> the thing this weekend and found that the shop had a really screwy idea
> about proper vac line reconnection, even with the diagram I gave them before
> the work started. I found the distributor hooked up to ported vacuum and the
> manifold vac nipple wide open. A couple of others were just hanging loose.
> Sheesh. Odd that it ran so smoothly for the first 1000 miles.
>
> I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
> things go from here.
>
> Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
> the time at cruise - only when I goosed it a *little*. I'd give it more
> pedal and the knock disappeared. Never pinged on hills or hard acceleration,
> just most frequent in the pedal range that was *just* past where cruising
> speed sits.
>
> Someone mentioned jet size as a possible problem. I didn't realize Carter
> BBDs have optional sizes available. Who sells them? I thought I'd check it
> out if I end up tearing the carb apart.
>
> > From: bllsht <nospam@invaliddot.net>
> > Reply-To: nospam@dot.net
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Tue, 04 May 2004 22:38:05 -0700
> > Subject: Re: Ping revisited
> >
> > IF you're setting the timing at idle speed, you're way too advanced.
> >
> > Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> > switch assy electrical connector unplugged, and engine running at 1600 RPM.
> >
> > Could also be your knock sensor has gone south.
port. Have you tried it with the vacuum fixed up?
You are not describing a timing ping though. Pinging or spark knock
happens under load, the more load the more knock. It is the gas pre
igniting in the cylinders.
Having a 'rattle' or knock when you get lightly on the pedal is a loose
part, loose exhaust, loose something. A loose rod bearing cap can act
like that.
My stethoscope recommendation still stands....
The carter does have an adjustment inside for the gas metering rods. I
find when the are not right, the acceleration doesn't match up with the
gas pedal. Open too much and the best acceleration is at say 3/4 of the
way down on the pedal. Not enough and you don't get full power at full
throttle.
Mike
KurtS wrote:
>
> Sorry for taking so long to get back into the conversation I started. Life
> is busy right now...
>
> The knock sensor was my next guess. I actually had time to really dig into
> the thing this weekend and found that the shop had a really screwy idea
> about proper vac line reconnection, even with the diagram I gave them before
> the work started. I found the distributor hooked up to ported vacuum and the
> manifold vac nipple wide open. A couple of others were just hanging loose.
> Sheesh. Odd that it ran so smoothly for the first 1000 miles.
>
> I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
> things go from here.
>
> Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
> the time at cruise - only when I goosed it a *little*. I'd give it more
> pedal and the knock disappeared. Never pinged on hills or hard acceleration,
> just most frequent in the pedal range that was *just* past where cruising
> speed sits.
>
> Someone mentioned jet size as a possible problem. I didn't realize Carter
> BBDs have optional sizes available. Who sells them? I thought I'd check it
> out if I end up tearing the carb apart.
>
> > From: bllsht <nospam@invaliddot.net>
> > Reply-To: nospam@dot.net
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Tue, 04 May 2004 22:38:05 -0700
> > Subject: Re: Ping revisited
> >
> > IF you're setting the timing at idle speed, you're way too advanced.
> >
> > Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> > switch assy electrical connector unplugged, and engine running at 1600 RPM.
> >
> > Could also be your knock sensor has gone south.
05-31-2004, 01:51 PM
#40
Guest
Posts: n/a
Re: Ping revisited
You could maybe have had the timing not advancing right from the open
port. Have you tried it with the vacuum fixed up?
You are not describing a timing ping though. Pinging or spark knock
happens under load, the more load the more knock. It is the gas pre
igniting in the cylinders.
Having a 'rattle' or knock when you get lightly on the pedal is a loose
part, loose exhaust, loose something. A loose rod bearing cap can act
like that.
My stethoscope recommendation still stands....
The carter does have an adjustment inside for the gas metering rods. I
find when the are not right, the acceleration doesn't match up with the
gas pedal. Open too much and the best acceleration is at say 3/4 of the
way down on the pedal. Not enough and you don't get full power at full
throttle.
Mike
KurtS wrote:
>
> Sorry for taking so long to get back into the conversation I started. Life
> is busy right now...
>
> The knock sensor was my next guess. I actually had time to really dig into
> the thing this weekend and found that the shop had a really screwy idea
> about proper vac line reconnection, even with the diagram I gave them before
> the work started. I found the distributor hooked up to ported vacuum and the
> manifold vac nipple wide open. A couple of others were just hanging loose.
> Sheesh. Odd that it ran so smoothly for the first 1000 miles.
>
> I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
> things go from here.
>
> Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
> the time at cruise - only when I goosed it a *little*. I'd give it more
> pedal and the knock disappeared. Never pinged on hills or hard acceleration,
> just most frequent in the pedal range that was *just* past where cruising
> speed sits.
>
> Someone mentioned jet size as a possible problem. I didn't realize Carter
> BBDs have optional sizes available. Who sells them? I thought I'd check it
> out if I end up tearing the carb apart.
>
> > From: bllsht <nospam@invaliddot.net>
> > Reply-To: nospam@dot.net
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Tue, 04 May 2004 22:38:05 -0700
> > Subject: Re: Ping revisited
> >
> > IF you're setting the timing at idle speed, you're way too advanced.
> >
> > Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> > switch assy electrical connector unplugged, and engine running at 1600 RPM.
> >
> > Could also be your knock sensor has gone south.
port. Have you tried it with the vacuum fixed up?
You are not describing a timing ping though. Pinging or spark knock
happens under load, the more load the more knock. It is the gas pre
igniting in the cylinders.
Having a 'rattle' or knock when you get lightly on the pedal is a loose
part, loose exhaust, loose something. A loose rod bearing cap can act
like that.
My stethoscope recommendation still stands....
The carter does have an adjustment inside for the gas metering rods. I
find when the are not right, the acceleration doesn't match up with the
gas pedal. Open too much and the best acceleration is at say 3/4 of the
way down on the pedal. Not enough and you don't get full power at full
throttle.
Mike
KurtS wrote:
>
> Sorry for taking so long to get back into the conversation I started. Life
> is busy right now...
>
> The knock sensor was my next guess. I actually had time to really dig into
> the thing this weekend and found that the shop had a really screwy idea
> about proper vac line reconnection, even with the diagram I gave them before
> the work started. I found the distributor hooked up to ported vacuum and the
> manifold vac nipple wide open. A couple of others were just hanging loose.
> Sheesh. Odd that it ran so smoothly for the first 1000 miles.
>
> I did have the timing set 9 deg BTDC @ 1600 so that wasn't it. We'll see how
> things go from here.
>
> Mike R: I think I was unclear on the ping frequency. It wasn't doing it all
> the time at cruise - only when I goosed it a *little*. I'd give it more
> pedal and the knock disappeared. Never pinged on hills or hard acceleration,
> just most frequent in the pedal range that was *just* past where cruising
> speed sits.
>
> Someone mentioned jet size as a possible problem. I didn't realize Carter
> BBDs have optional sizes available. Who sells them? I thought I'd check it
> out if I end up tearing the carb apart.
>
> > From: bllsht <nospam@invaliddot.net>
> > Reply-To: nospam@dot.net
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Tue, 04 May 2004 22:38:05 -0700
> > Subject: Re: Ping revisited
> >
> > IF you're setting the timing at idle speed, you're way too advanced.
> >
> > Set it to 9 degrees with the vac advance hose disconnected and plugged, vacuum
> > switch assy electrical connector unplugged, and engine running at 1600 RPM.
> >
> > Could also be your knock sensor has gone south.