Hi everyone
I have a 2008 G37s about 45k on it I just got it check by the Infiniti service shop
And they said everything was good with it last night I went in someone's drive way and scratch the bottom of my car as I drove in to park my car I notice a tapping or knocking sound after. when i drive above 25 there is no sound but when I start slowing down with out stepping on the gas or brake the sound starts...
( not sure if this is important but I recently plasti dip my rims I only remove one rim and decided to leave the rest on my car i made sure everything was covered like the rotors etc i put on the rim that I remove the next day I drove it there was no issues)
Please help
Thanks

 

I don't think plastidip would really damage anything and cause noises. Did you look under your car to see if maybe you ripped part of the under-shroud off?

 

Jack up your car and place it on stands. Get underneath your car. Look for anything that is heavily scraped, bent, or broken. Your problem is probably in that area. If the damage is something you can't replace or repair yourself, take it to a mechanic and let them know what the problem is.

 

Umm I don't think I bent or broken anything I didn't drive fast I stop before going into the driveway

 

Ya I don't think plasti dip would damage I look under my car everything looks normal it weird when I pull in that drive way that's when I notice the sound

 

It's probably the under shroud / splash shield. Look under the car and make sure it's still attached.

 

I will check it out hopefully that's what it is thanks

 

Are you possibly hearing the catalytic converters popping and cracking?

David