So im driving home from work yesterday and notice, an od clicking or "clunking" noise not really loud but defintly not the norm. It only seems to happen when I p8sh the accelerator quick, or when i rev the engine. its not a constant noise either if i hold the pedal downa bit and let it sit around 2,000 rpms it doesn't make the noise. its just like a quick little clicck clunk..now to me not know **** about engines, thought it sounded like a rock or something kicking around somewhere it shouldn't be however I have heard the noise before on other cars. Anyone have any idea what this might be? thanks.

EDIT: actually, if you can think of the noise a car makes when it stalls or overheats while going a god 40 mph the click clunck noise the pistons make when they suddenyl loose power or whatever, its almost like that noise.

 

Sounds like engine knock. You could have a bad knock sensor, a common problem.

Pull the codes from your ECU, and see if you get code 0304...

 

Doesn't the check engine light have to be on for it to post codes? and if not it only does 1 code or somethin, where did I read that heh, anyway my check engine light isn't on. Code thing still useable?

 

http://vbxmaxima.8m.com/ecu.html

this will help you in how to check the ECU.

 

A bad knock sensor will not cause the check engine light to come on, but if you get the code it's bad...