1988 fiero 2.5 runs for a few minutes then dies. please help

Real tech discussion on design, fabrication, testing, development of custom or adapted parts for Pontiac Fieros. Not questions about the power a CAI will give.

Moderators: The Dark Side of Will, Series8217

Post Reply
needhelp
Posts: 1
Joined: Tue Sep 09, 2014 1:32 pm

1988 fiero 2.5 runs for a few minutes then dies. please help

Post by needhelp »

I have a 88 fiero 2.5. It will fire right up when cold and run a few minutes then die. After it dies it will spray fuel when you turn the key on and it will start but will nor continue to spray and only runs a second then dues. If it sits about 20 minutes it will start and run for 10 minutes or so they die and not spray fuel. I have replace the crankshaft sensor and ignition module and coolant temp sensor and nothing has changed it.
User avatar
Series8217
1988 Fiero Track Car
Posts: 5981
Joined: Thu Jun 02, 2005 9:47 pm
Location: Los Angeles, CA

Re: 1988 fiero 2.5 runs for a few minutes then dies. please

Post by Series8217 »

Sounds like a bad ECU. I had exactly the same problem on an '88 with a 2.5.

Over time, the conformal coating on the main circuit board shrinks, and bends the board, breaking it in random places. The solution is to buy a new or remanufactured ECU.
Post Reply