I've been hearing this loud rattling, clicking, grinding noise from the undercarriage of my Z for 3 months now. Its weird because there isn't a specific place I can point to where the noise is coming from. It varies, goes from front below the engine and in or by the transmission to back to rear axles( most of the time its in the front). It is always present for about a second when I lunch slowly from 1st, and any little bump I hit on the road the noise is back, I can also hear it some times very loudly on a wide left turn. I have no idea what this can be, I checked both wheels at the front and every thing looks solid. any idea? speculations? Would really appreciate this, thanks fellow Z owners.

 

Have you taken it to a mechanic? Kinda vague in your description.

 

Please help is an excellent descriptive title too. So if I'm getting this right you have a noise, somewhere in the car sometimes...

 

sorry for vague description. Its this grinding noise, most of the time it sounds like its coming from underneath the engine or in or underneath the transmission. It is present when I lunch the car from first, and i can always hear it when on speed bumps, some times its very loud and I can feel it.

 

Do you have aftermarket sway bars?

 

Mine had a kind of grinding noise as you described. It sounds strange, but I changed the oil and the noise went away. Maybe check and see if your oil is low?

 

Aftermarket exhaust? Pipes are hitting on frame, maybe?

 

Aftermarket flywheel? Possibly even a basic dual mass flywheel that is loud. Does it sound like this...

http://www.youtube.com/watch?v=YyFgTg57j0Y

 

Every thing is stock on the car. Its probably not the flywheel since the noise is only present for a second when I lunch the car, or when I turn or go over bumps.

 

Just a suggestion. Put a subject in the subject line like

Squeaking brakes

instead of

Help

Need help immediately

or

If you don't help right away I will die!

 

I tend to wait several days before I click on those types of thread to see if the person actually dies.

 

is there anyway I can edit the title now?

 

Question - why are you having your car for "lunch"?

 

launch*

 

Why don't you guys actually help him out instead of criticizing everything he does?

 

youll get used to it. and then youll find it funny... sooo look over your posts before you submit them and SEARCH first.

 

Well, if it were a knocking sound from the rear I would be looking at your diff bushing. The fact that the noise travels around the car is rather odd. I would suggest having a look under there to make sure you didn't run anything over. Have a look at the rear sub frame where the stud from the diff cover goes through and see if there is fluid coming out of the bushing.

Other than that, try your best to find out when the noise is the worst and get a better idea of where it is coming from. Diagnosing noises like this without actually seeing the car is pretty tough so more info will give you a better chance at getting some reasonable advice.

 

You are dragging a dead cat under your Z. Stop doing that, its a Z not a Buick. You might not believe me now but you will when it starts to smell

 

Thanks man appreciate it

 

The video posted by Zazz93 in post # 8 sounds like the AC compressor turning on and off.