• Tiny
  • JWC
  • 2003 Jeep Liberty
  • 6 CYL
  • 4WD
  • automatic
  • 86,000 miles

I have 2003 Jeep Liberty and just had to replace the head gaskets. The week after I pick it up from the garage I get a Mil light, although engine ran fine. It was a misfire but seemed to be a one time accurance so it was reset. Two weeks later I start up the jeep get a flashing Mil light and the engine shuts off. I checked the codes and have misfires on each cylinder (3.7 V-6) and a oxygen sensor slow response. The engine will crank fine but not fire. I will go back to the shop on Tuesday but am looking for any help before then. Thanks for any advice.

Do you
have the same problem?
Sunday, May 29th, 2011 AT 4:42 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems
with compression and valves opening and closing at the wrong time/broken or jumped timing

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Wednesday, June 29th, 2011 AT 9:44 AM

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