slamm69

iTrader: (1)

I put a new GM opti and Hypertech coil on my 95 bird.It ran fine untill reaching operating temp.Then if you slowly rev it to around 3000 or above it felt like it lost all fire.When the rpms come back down it backfires out the exhaust real bad.I replaced the coil with another Hypertech but still same problem.So I put my stock coil back on and it ran fine no problems for a few months.But now that the weather has heated up it started doing the same thing again.If you run it hard through the rpms it is fine.Only craps out if you rev it slow or if you decelarate with a lower gear.Now it has no fire and wont crank after a bad stall and backfire.Could the new opti cause this problem without throwing any codes?Any help is greatly appreciated. LORD PLEASE MAKE A BETTER OPTI FOR LT1 LOVERS,PLEASE.....

Black1997T/A

Might be the ICM, I know they are pretty sensitive to heat, Just my guess.

slamm69

iTrader: (1)

Seems you are correct I think it is the ICM. Thanks for your input.Damn these things are expensive.

lt1camaro95

If you started having it after replacing the new opti, then you have a bad opti again. Order one from Summit and replace it. If it has stopped running on you, use this troubleshooting guide to diagnose the bad opti. The part about checking the fuel injector connector worked for me.

http://www.mainstreamtopics.com/foru...p?showtopic=78

blkchevyz

sounds like o2 sensors to me.

Ed Wright

iTrader: (1)

I don't think so.

blkchevyz

really?

sounds like once it hits closed loop its running like ****.

slow96z

iTrader: (12)

If it is the ICM and coil I have one I'll sell you for $40 + shipping

slamm69

iTrader: (1)

I replaced the ICM now everything is fine.I started thinking it was the opti, but decided to start on the easy **** first,coil and ICM.Since I had extras to use as a test.Coil did nothing,ICM fired right up and now runs great.THANKS FOR ALL THE HELP