Mike Romain

I read that again.

A systematic vibe and a knock, well...

There is a cover plate on the bottom of the flywheel you can remove to
see if a bolt is backing out of the pressure plate and ticking
something.

Mike

KurtS wrote:
>
> It's actually much better now the vac lines are correct. I put a stethoscope
> on it today and didn't hear a thing (in the driveway). I'll have to rig it
> so i can listen on the highway. The rattle is only noticeable after a gear
> change or when giving it gas after slowing down on the highway. I CAN feel a
> slight vibration as the clutch spins down when I push the clutch pedal in.
> Didn't do that before they changed the clutch. I wonder...
> Damnit i hate chasing gremlins.
>
> I'll let you know what I find.
>
> > From: Mike Romain <romainm@sympatico.ca>
> > Organization: Bell Sympatico
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Mon, 31 May 2004 13:51:15 -0400
> > Subject: 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.

Mike Romain

I read that again.

A systematic vibe and a knock, well...

There is a cover plate on the bottom of the flywheel you can remove to
see if a bolt is backing out of the pressure plate and ticking
something.

Mike

KurtS wrote:
>
> It's actually much better now the vac lines are correct. I put a stethoscope
> on it today and didn't hear a thing (in the driveway). I'll have to rig it
> so i can listen on the highway. The rattle is only noticeable after a gear
> change or when giving it gas after slowing down on the highway. I CAN feel a
> slight vibration as the clutch spins down when I push the clutch pedal in.
> Didn't do that before they changed the clutch. I wonder...
> Damnit i hate chasing gremlins.
>
> I'll let you know what I find.
>
> > From: Mike Romain <romainm@sympatico.ca>
> > Organization: Bell Sympatico
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Mon, 31 May 2004 13:51:15 -0400
> > Subject: 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.

Mike Romain

I read that again.

A systematic vibe and a knock, well...

There is a cover plate on the bottom of the flywheel you can remove to
see if a bolt is backing out of the pressure plate and ticking
something.

Mike

KurtS wrote:
>
> It's actually much better now the vac lines are correct. I put a stethoscope
> on it today and didn't hear a thing (in the driveway). I'll have to rig it
> so i can listen on the highway. The rattle is only noticeable after a gear
> change or when giving it gas after slowing down on the highway. I CAN feel a
> slight vibration as the clutch spins down when I push the clutch pedal in.
> Didn't do that before they changed the clutch. I wonder...
> Damnit i hate chasing gremlins.
>
> I'll let you know what I find.
>
> > From: Mike Romain <romainm@sympatico.ca>
> > Organization: Bell Sympatico
> > Newsgroups: rec.autos.makers.jeep+******
> > Date: Mon, 31 May 2004 13:51:15 -0400
> > Subject: 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.