whys it doing this?

[SpaceGoat]

While driving, if you rev beyond 3000 rpms, the engine will make this strange clicking noise for about 5 seconds. After that the service engine soon light comes on and the performance of my car seems hurt at the top end. Anyone have any suggestions? Thanks
-SpaceGoat

 

[Tuna]

Pinging?

Could it be that the knock sensors are not working correctly?

What codes are showing?

 

[Ken]

... this strange clicking noise

:confused

 

[vetteboy86]

How about a timing issue?


craig

 

[Vettefan87]

I agree with Ken. We need more information. Keep us updated.

 

[86PACER]

Pull the codes: All you need is a paper clip.
http://www.c4vettes.com/ecm.htm