shuttering at load
#1
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Joined: Aug 2004
Posts: 21
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From: Austin, TX
Car: 1989 Pontiac Trans AM GTA
Engine: 305 TPI
Transmission: Borg Warner T5
shuttering at load
On my '89 Trans am (305 TPI / 5 speed T5) that has 169k miles, I have recently felt the car 'shutter' when it is under load. It doesn't seem to matter what gear I am in or how fast I am going. On some days it will be worse than others. If I rev the engine while parked, it wont misfire or anything. But, while driving it will seem to almost 'skip'. It had sat for a few weeks and upon driving it again, this started.
Here are the things that I have tried so far:
- replaced gas with fresh 93 oct
- added 'water remover' additive to gas
- replaced fuel filter
- changed oil
- replaced spark plugs -- they did not look terrible, but had 40k miles on them.
- added injector cleaner to gas
Thoughts:
- When the issue occurs, the tachometer does not jump as I would have guessed. Does that mean it is a drive line related issue instead?
- Clutch has about 70k miles on it .. any suggestions on how to 'test' it to see if that is the issue?
- Transmission, Differential and Engine are 100% original .. with no rebuilds. Would this be an indication of transmission failure or rear differential issues? (Yes I am well aware that they ALL need to be rebuilt).
Here are the things that I have tried so far:
- replaced gas with fresh 93 oct
- added 'water remover' additive to gas
- replaced fuel filter
- changed oil
- replaced spark plugs -- they did not look terrible, but had 40k miles on them.
- added injector cleaner to gas
Thoughts:
- When the issue occurs, the tachometer does not jump as I would have guessed. Does that mean it is a drive line related issue instead?
- Clutch has about 70k miles on it .. any suggestions on how to 'test' it to see if that is the issue?
- Transmission, Differential and Engine are 100% original .. with no rebuilds. Would this be an indication of transmission failure or rear differential issues? (Yes I am well aware that they ALL need to be rebuilt).
#2
Junior Member
Joined: Dec 2009
Posts: 30
Likes: 0
From: St.John's, Newfoundland, Canada
Car: 1986 Camaro Z28
Engine: 355 4 bolt 4bbl
Transmission: T-5 manual
Axle/Gears: 3.73 posi.
Re: shuttering at load
Could it be a warped flywheel, or hot spots on the flywheel/pressure plate. My car shutterd really bad when starting off and it was the flywheel.
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