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Thumping sound coming from directly under under me??

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Thumping sound coming from directly under under me??

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Old 04-05-2018, 11:35 PM
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Thumping sound coming from directly under under me??

New member here, needed some insight on an issue with my 05 G35 coupe. Problem is a thump/pop sound + vibration is coming from the car. While I drive the thump feels like it's directly under me but when I get under the car, the sounds appears to come more from directly underneath the dash/towards engine area. The frequentness of the thump also increases with the AC turned on. Another bit of info is that at first when this started, I only happen when I had the car in drive. Now, the thump occurs in Drive, Reverse, and Park. Also, There is no loss in performance and if I'm able to capture a good clip of sound, I will post. If anyone could help that'd be great, thanks!!
 
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Old 04-06-2018, 02:26 AM
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U sure u didnt run over somebody?
 
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Old 04-06-2018, 05:52 AM
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Originally Posted by Johnny1221 View Post
New member here, needed some insight on an issue with my 05 G35 coupe. Problem is a thump/pop sound + vibration is coming from the car. While I drive the thump feels like it's directly under me but when I get under the car, the sounds appears to come more from directly underneath the dash/towards engine area. The frequentness of the thump also increases with the AC turned on. Another bit of info is that at first when this started, I only happen when I had the car in drive. Now, the thump occurs in Drive, Reverse, and Park. Also, There is no loss in performance and if I'm able to capture a good clip of sound, I will post. If anyone could help that'd be great, thanks!!
Did you closely inspect your tires?
Are any wheels out of balance?
How old are your tires?
Did you ever check them for correct tire pressure?
Does the thump disappear with the AC turned off?
Did you ever inspect your belts?

Telcoman
 
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Old 04-06-2018, 07:18 AM
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Tires. They feather on these cars on the inner edges up front due to the factory alignment specs.

Crank your wheels all the way to one side and go out and look at the inner edge of the tires... they probably all worn out and in need of replacement.

How many miles do you have on them? Most people get between 10 to 20K on a set of tires in a G35 Coupe, depending on how you drive. The front tire wear sneaks up on you though whereas the rears are pretty obvious because they tend to wear evenly and you can feel them slipping as they wear in rain and cooler weather.
 
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Old 04-06-2018, 06:32 PM
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It's not the tires.

Yeah I've read various responses that guess it's the tires, but the thump feeling doesn't occur while I'm driving, only when I'm stopped at a stopped light or a moment where I'm completely stopped with the car in Drive. Just like I stated before, the thump didn't occur when the car was in Parked, but after a while, it eventually occurred while in Park as well.
 
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Old 04-06-2018, 07:11 PM
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Are you sure you don't have something heavy in the trunk rolling around and banging into things? Check to make sure your spare tire and Jack in the trunk are secure and the battery under the hood is locked down tight.
 
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Old 04-06-2018, 10:03 PM
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It couldn't be that either, the location of the noise feels right underneath me while I'm driving/stop at red light and when I get out to listen while in Park, the sounds appears to be underneath the car, directly under the gas/brake pedal
 
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Old 04-07-2018, 01:42 PM
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Okay I listened to some YouTube clips and what resembles it most is an exhaust misfire. Any ideas what it could be??
 
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Old 04-07-2018, 06:21 PM
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I think you need to drive to a lube center with a pit and tip the guys a few bucks to drive your car onto the pit so you can get underneath it for a better listen.
 
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