Rough sound at startup certain RPMs [Archive] - GrandAmGT.com Forum

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primalfl
04-19-2008, 07:55 PM
During start up and idle, my 03 2.2L GA is sounding very rough. Sort of like a humming/vibrating sound. Sometimes the sound is what I can only describe as metal making a rat-tat-tat-tat sound that lasts 2-3 seconds but most of the time it's just a loud humm. The same humming/vibration is happening while driving around with the RPM around 800 and 1800. Driving at most other RPMs is fine.

I checked under the hood and I can't hear any of the sounds from there. I can only hear the sounds from inside the car. It sounds like it coming from either directly under the car opposite the gas/brake pedals or in the dash.

Any guesses?

cardude007617
04-19-2008, 10:28 PM
piston slap?

flan flan
04-19-2008, 11:23 PM
did you check to see if your exhaust was hitting the heat shield?

primalfl
04-20-2008, 09:03 AM
did you check to see if your exhaust was hitting the heat shield?

Would that be visible without lifting up the car? How would one be able to fix that? Or is that only a job that a shop can do?