Got a 95 z28. I can start the car fine , drive about 3 miles and the engine will shut off completely. the engine wont start untill the engine cools down for quite a while . thought it was a coil issue so replaced that. the engine turns over but wont start. is this onen of those optispark issues?

 

Does it have a spark while cranking?
Is the fuel presure good while cranking?
When it stops, does it sputter or just drops dead?

 

still have to check the fuel pressure and for spark. it doesnt sputter it just drops dead with no warning like you turned the key off

 

Sounds like an ignition problem, but before getting a new Opti, I would change the ignition module. Lot cheaper and easier, and they can be affected by heat if not bolted tight against the engine and using dielectric grease to conduct heat better. You may also want to take a look at all the wiring and connectors between the Opti, coil, and ignition module, as they have a habit of corroding.

 

great thanks allot pete. appreciate all the help . will check it out today and let ya know how i make out

 

changes the ignition module tonight , let it run for about 1/2 hour and no problems so far. it only ran for 5 mins or so b4 so i think were good. thanks for your help pete.