Mechanics

WEILL NOT RUN

1987 Jeep Comanche • 6 cylinder 4WD Manual • 168 miles

I have a 1987 Jeep Comanche Pioneer, 4.0 6cyl, 5 speed man, 4X4. I have replaced the following parts: fuel pump, map sensor, fuel regulator, TPS sensor, mat sensor, cam sensor, crank sensor, electronic igniter, all relays, , ECM. It will start and idle, but if you accelerate it dies. Any ideas?
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JCarey
July 9, 2011.



It might be time to stop throwing parts at it and doing some diagnostic testing. I would start with the fuel pressure.

Wrenchtech
Jul 9, 2011.
I think I have sufficient pressure because I replaced the fuel pump and added a second booster pump after the fuel filter.

Tiny
JCarey
Jul 9, 2011.
No wonder you're having problems. What is the current fuel pressure?

Wrenchtech
Jul 9, 2011.
I don't know, I don't have a gauge, but I replaced the regulator today. The booster pump is a 60 psi max, 31psi at idle.

Tiny
JCarey
Jul 9, 2011.
I'm sorry. That's not the way we work. The vehicle requires a specific fuel pressure.

Wrenchtech
Jul 9, 2011.