RUNS ROUGH AFTER WARM UP

  • Tiny
  • reeln1in
  • 1993 Jeep Grand Cherokee
  • V8
  • 4WD
  • automatic
  • 200,000 miles

My daughter has a 93 Grand Cherokee limited, 5.2l automatic, with 200k miles. The engine runs fine, smooth and plenty of power till it get to operating temp(205*), then runs rough and acts like the timing is off. I have changed both cam and crank ps', rotor, cap, oil, air and fuel filters, plugs n wires, fuel pump, thermostat and ecu temp sensor, vacuum hoses, pcv valve, alternator and battery. I don't get and codes (12 no codes and 55 end of codes). I am at my wits end! Does anyone have any ideas or had this problem before?

Thursday, May 19th, 2011 AT 11:05 PM

1 Answer

  • Tiny
  • rasmataz
  • Member

Check the fuel pressure if its within specs though the fuel pump is new, also test the MAP and TPS sensors

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Tuesday, June 28th, 2011 AT 10:55 AM

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