Chasing a vibration! Opinions/experience request!
Thread Starter
Teching In
Joined: Nov 2011
Posts: 25
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From: New London, CT
Chasing a vibration! Opinions/experience request! Alright, I have a 2002 Trans Am, Automatic w/about 60,000 miles. The car is stock besides cat-back, intake, and wheels. I get good amount of vibration sound (from under dash) and feel (in gas pedal) at 1100-1300 rpms when in gear. Doesn't do it in nuetral or park.
I checked the harmonic damper, seems to be on there solid. Driveshaft seemed alright. Tranny mount looks/feels fine. Not sure what it could be... don't want to get charged an arm and leg at a shop for them to chase the vibration down.
Any thoughts...?
I checked the harmonic damper, seems to be on there solid. Driveshaft seemed alright. Tranny mount looks/feels fine. Not sure what it could be... don't want to get charged an arm and leg at a shop for them to chase the vibration down.
Any thoughts...?
TECH Resident
Joined: Nov 2011
Posts: 812
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From: NJ
what speeds?
take the driveshaft out to check the universals. often, they'll sorta seize. when this happens, they'll feel good if you only grab the driveshaft and wiggle. they can, and will cause vibrations though. it was common like that on ford vans in the 80's.
other thing to check, is tires for balance, transmission mount,
take the driveshaft out to check the universals. often, they'll sorta seize. when this happens, they'll feel good if you only grab the driveshaft and wiggle. they can, and will cause vibrations though. it was common like that on ford vans in the 80's.
other thing to check, is tires for balance, transmission mount,
Thread Starter
Teching In
Joined: Nov 2011
Posts: 25
Likes: 0
From: New London, CT
Thansk for the suggestions.
It is not speed related, but RPM related. 1,100 - 1,300 rpm range when in gear. I can feel the slightest thing when in park and bring it up to that rpm range... but I might be psyching myself out now haha.
It is not speed related, but RPM related. 1,100 - 1,300 rpm range when in gear. I can feel the slightest thing when in park and bring it up to that rpm range... but I might be psyching myself out now haha.
TECH Resident
Joined: Nov 2011
Posts: 812
Likes: 0
From: NJ
wait.....only at that rpm? regardless of speed? it only has to be in gear? is it a steady vibration, or could it possibly be something like an erratic misfire doing it? i ask, because i've seen egr's open too soon, creating a lean misfire. i'm kinda drawing straws on that one, but it could be something to check.
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Verdad Gallardo TECH Resident
Joined: Nov 2011
Posts: 812
Likes: 0
From: NJ
if this is steady, and only at that rpm, and only in gear, then it would have to be something inside the transmission, even if it's doing it when not moving, but torquing to that rpm.
this is a tough one. the tough ones are fun.
