Thread: low tapping noise at idle but not in park

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  1. #1 low tapping noise at idle but not in park 
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    Hello - new to the forum. I have a 2007 GP with 305k miles and has been just a wonderful vehicle Recently i started hearing a low tapping noise from what sounds like drivers side. It's not very loud and i have to turn the radio down or off to really hear it well. Also, I don't hear it when the car is in park or in neutral. only at idle. The car doesn't make any knocking noise while driving and pick up is smooth. I recently had a trans rebuild (new torque converter as part of it) but i heard the tapping noise before the rebuild. Just want to make sure i mention the trans rebuild here. Any ideas what this might be? I know it could be one of many things. Many thanks for any help.
    Last edited by pahlers; 11-22-2019 at 12:21 PM.
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  2. #2 Re: low tapping noise at idle but not in park 
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    So the sound is only at idle, in gear? I'd guess header/exhaust leak. In gear your idle is lowest, and vacuum is highest so more likely to hear a small exhaust leak.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  4. #3 Re: low tapping noise at idle but not in park 
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    get someone to help ya. get em in the divers seat, pop the hood, and listen for where its coming from.
    08 grand prix NA3800
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