Elusive Thumping Sound - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 06-18-2013, 03:44 PM Thread Starter
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Elusive Thumping Sound

I have an '04 GTO with 140,000 miles. Whenever I accelerate with the engine speed at 2700 to 3500 RPM, I get this rapid thumping that can be heard and felt--so much so during hard throttle that it feels like something is pounding on the vehicle. It is more prevalent in the higher gears and only does it during acceleration/deceleration. I've had it in the shop twice for this but the source has not yet been found. Has anyone else had this problem?
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post #2 of 3 (permalink) Old 06-18-2013, 06:37 PM
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Just a guess, check your engine / trans mounts.
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post #3 of 3 (permalink) Old 06-19-2013, 08:23 AM
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Check the rubber guibos

2004 Blk/Rd M6
6.3 litre LS1

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