i changed the opti.i had it in the right spot and everything was good.i even started it before i put the waterpump and belts on and it ran fine.i put everything back and took it for a test drive.ran good.came home and it sat for 3 hours.went back out to start it and drove it down the street and it wanted to cut off and it was running rough and now its doing the same thing from the beginning when the opti was bad. any suggestions why it would run and drive and now its not.i double checked everything and its on right.now what.i have a 94 caprice with the lt1 with the vented opti

 

Check coil and ignition module, but if you said it ran good for a while, look for water leaks near opti.

 

coil and ignition modules like act up when they get warm if they are bad

 

no water leaks at all.the and everything module are fine.i went and got a new icm and put it on just to see what would happen and its the same.so i took it back.im stuck.ive checked all the wiring.now if the opti was on wrong then i wouldnt of been able to drive it like i did right?i had it running for like 20 min straight cause it was sitting for a while.and it ran fine.idle fine and drove fine.now its back to when the opti was bad.

 

Since your old one was replaced, how did it fail? Is it possible the cam pin dimension is off leading to premature opti failure?

 

im not sure but i bought like it was.i noticed when i got the car home.{which i had towed}.i looked in the trunk and the was alot of water and antifreeze bottles.so the first thing that came to mind was the water was bad and shot the opti.so i replaced the opti and the water pump.im not really sure what you mean when you say Is it possible the cam pin dimension is off leading to premature opti failure?the little pin was in the right hole when installed if thats what you mean.what is the cam pin dimension?thanks alot for your guys help

 

I like what Jay said. So the first question is does it run fine until it gets hot?
Here's a picture of what I was refering to about the cam pin dimensions curtesy of Rob. Thanks Rob.



Let us know

 

Just a note, I think recently comp no longer has that issue with the longer dowel pins. My friend just installed a cc503 and the cam dowel was the right length.. I know mine wasn't 3 years ago when I installed it.

Of course, should still be checked..

 

Always.