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Occasional thunking noise

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Old 21 Apr 2014, 03:08 pm
Fresh Cruiser
Join Date: Mar 2014
Posts: 37
Default Occasional thunking noise

So when i start my 2007 PT cruiser, and sometimes when I am driving, There is a audible THUNK that I can hear coming from under the car.

Searching the forums it seems like the common problem is the control brushing or something like that

Will this show up on a scan? I also have a check engine light on now that just started today. I occasionally get them, but usually it turns off on its own, something i learned is attributed to the gas or something that sorts itself out.
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Old 21 Apr 2014, 05:15 pm
quicksilverdon's Avatar
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Join Date: Nov 2003
Location: Felton, Delaware
Posts: 20,501
Default Re: Occasional thunking noise

Scan will be no help for a thunk.
Some possibilities -
exhaust hitting
bell crank/watts link
spare tire mounting
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Old 21 Apr 2014, 06:49 pm
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Join Date: Apr 2010
Posts: 14
Default Re: Occasional thunking noise

I had a thunk going on for a while, turns out the gas filler tube was bangin around up under the car
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Old 22 Apr 2014, 10:21 am
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Join Date: Sep 2002
Location: Just south of the Mason/Dixon line
Posts: 1,713
Default Re: Occasional thunking noise

also worn shock mounts
'03 GT base w/175k and a 2 speed autostick (read: trans is shot) and powered by a hybrid MOPAR S3 with DSP untuned
1st Forward Motion E1 powered PTGT w/Psi-Fi Power pack fuel tuner back in '07
FS: '03 GT Elec Blue w/rear suicide doors or '03 auto PCM, S3 turbofold, WGA, 3.5" o2 & 3" DP - make offer
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