V-EIGHT

I just bought a 93Z with a Comp cam 227/233 .560/.569 and Pro-Magnum 1.6 Roller Rockers. The computer has been done by PCMforless. After it comes to operating temp, and it sits at idle for a minute or two, the RPM's start surging from 600-900, not real fast like Ive seen high performance carb'd engines do, but not extremely slow. This is normal for that size cam?

Im just getting use to the car and the things it dose and the sounds it makes, so I'll prolly have more questions in the next few weeks

Injuneer

Questions like this should be posted in "LT1 Engine Tech" for the best responses, not in "Advanced Tech". I'll move it for you.....

ChrisUlrich

My car doesn't do that

V-EIGHT

Is your engine stock?

V-EIGHT

Mabey its just searching for an idle?? No SES light or stalling. If thats all it is, what can fix it?

ChrisUlrich

same cam

V-EIGHT

Who did your computer?

V-EIGHT

Now Im pretty sure its just searching for an idle. Shouldnt the computer reprograming taken care of that?

1racerdude

Throttle blades been opened?
Sounds like your IAS motor needs cleaning because it can't adjust quick enough.

V-EIGHT

How do I clean that?

1racerdude

Get some carb and choke cleaner,take it off and clean the catbon and sludge.

TransAmGT

I have a cc306 and my idle sits rit on 925rpm just like i set it...does move at all!

V-EIGHT

At least mine dosent bounce all over the place. just 200-400 rpm's. Im gonna be taking to get a dyno tune, so they will taking care of everything.