Jeep has bad intermittent misfire and cuts out very bad!!! - Jeep Wrangler Forum

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Old 05-18-2009, 12:19 AM   #1
Join Date: May 2009
Location: Mid Michigan
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Angry Jeep has bad intermittent misfire and cuts out very bad!!!

Problems started a year or so ago, but only occurred once a month or so and mostly on humid days. But, now it is doing it more often and randomly. It will start fine and run fine then after a minute it starts cutting out, like the timing is way off or has a bad misfire. Then after a couple minutes of doing that it clears up and runs ok for awhile. The problems started getting worse after I put some injector cleaner in the gas tank and it even made the engine light come on. Error codes that came up were 12, 27 (a couple times), 42, 43 (four times). Have not taken it to auto place yet to get more detailed codes.

I tried new distributor cap, rotor, plugs, plug wires. Put a different coil in, had fuel pressure checked which came back between 45 and 50 psi. Then got the 3M injector cleaner that hooks up directly to the fuel rail and ran a can of that through it. Timing doesnt seem to be perfect as when I took the old dist. cap off it seem to be sparking on the corners of contacts instead of in middle, but could not turn it to adjust as I know most do? Any ideas or suggestions would be appreciated, I'm about to the point of just dropping it off at a dealership....
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Old 05-18-2009, 09:49 PM   #2
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Sounds like there could be moisture in the electrical somewhere, like the distributer. Use die-electric grease and wd-40 on the electrical connections.
2000 TJ-4.5" Rubicon Express Super Flex Kit-1" Body Lift-35X12.50X17 Procomp M/T's-Dick Cepeks-Some other modifications
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