1987 JEEP COMANCHE WEILL NOT RUN

  • Tiny
  • JCarey
  • 1987 Jeep Comanche
  • 6 CYL
  • 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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Saturday, July 9th, 2011 AT 9:28 PM

5 Replies

  • Tiny
  • Wrenchtech
  • Expert
  • 20,074 posts

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

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Saturday, July 9th, 2011 AT 9:51 PM
  • Tiny
  • JCarey
  • Member

I think I have sufficient pressure because I replaced the fuel pump and added a second booster pump after the fuel filter.

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Saturday, July 9th, 2011 AT 10:07 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,074 posts

No wonder you're having problems. What is the current fuel pressure?

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Saturday, July 9th, 2011 AT 10:11 PM
  • Tiny
  • JCarey
  • Member

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.

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Saturday, July 9th, 2011 AT 10:19 PM
  • Tiny
  • Wrenchtech
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  • 20,074 posts

I'm sorry. That's not the way we work. The vehicle requires a specific fuel pressure.

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Saturday, July 9th, 2011 AT 10:22 PM

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