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Re: Ping revisited
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+willys > > 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+willys > >>> 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. |
Re: Ping revisited
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+willys > > 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+willys > >>> 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. |
Re: Ping revisited
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+willys > > 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+willys > >>> 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. |
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