Hi Guys, I'm stumped and hope someone out there can help me out. I've got a 1990 Cheyenne, 2WD, 3/4 ton with AT and a 350 motor. On my way home last week it suddenly lost power and eventually stalled. While I could re-start the engine there was almost no power and I barely made it home.
The current symptoms are that it starts, runs rough then stalls after 10-30 seconds. Nice hot spark at coil, bottom of injectors are wet with fuel.
I've got the service manual and a Clymers and have always done my own repairs.
Things I've tried;
- have looked at the error codes and there are none in the ECM
- replaced the ignition module and verified the pick up coil is good
- checked ignition wire, all OK
- checked EGR valve and it works with no vacuum leaks, also verified the EGR solenoid is good
- replaced fuel filter
- fuel pump runs but no way to check fuel pressure
- no intake manifold vacuum leaks that I can see
My next thing to try is replace the fuel pump, but thats another $70 plus getting into the gas tank.
Help!!!!! Please don't ask if I've done the obvious things. I have. Steve