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52 Posts
Bear with me. I'm no mechanic and have posted this before. 2001 4.0 auto sahara 122k miles. Bought it about two months ago and dealer said he would fix anything wrong with it. Too bad for him. Lol. Shortly after I bought the jeep it would randomly die while driving. No warning no nothing. And was very hard to start. Sometimes up to 30 min before it would start. Was showing a crankshaft position sensor code. Jeep dealership replaced the cps and computer all on his dime.
Got it back and when driving on the interstate around 70 and it is up to temp it starts bucking and missing and cel light comes on. Now it is showing codes 300 302 all the way to 306. Random misfire... Can pull over and redstart and all is good until back around 70 or so, does it all over again.
Cat was tested and is fine. New coil rail, plugs (first champion double platinum and now champion truck plugs and they looked fine) and tps were put on. Battery and alternator tested fine and terminals are CLEAN. Voltage does not drop when it misfires. New mechanic yesterday put on a new fuel pump since he "determined" it was bad and sucking air in with the fuel. Drove it today and same thing...70 to 75mph started bucking, lost power and codes said random misfire all the way to the #6 cylinder.
Sorry for the long post but I'm lost and don't have any faith in mechanics around here anymore. Maybe a burned wire, bad ground, injector?? Weird how it does it at around 70 and I can kill it and it's fine until driving around 70mph again. It's fine running around town...
Got it back and when driving on the interstate around 70 and it is up to temp it starts bucking and missing and cel light comes on. Now it is showing codes 300 302 all the way to 306. Random misfire... Can pull over and redstart and all is good until back around 70 or so, does it all over again.
Cat was tested and is fine. New coil rail, plugs (first champion double platinum and now champion truck plugs and they looked fine) and tps were put on. Battery and alternator tested fine and terminals are CLEAN. Voltage does not drop when it misfires. New mechanic yesterday put on a new fuel pump since he "determined" it was bad and sucking air in with the fuel. Drove it today and same thing...70 to 75mph started bucking, lost power and codes said random misfire all the way to the #6 cylinder.
Sorry for the long post but I'm lost and don't have any faith in mechanics around here anymore. Maybe a burned wire, bad ground, injector?? Weird how it does it at around 70 and I can kill it and it's fine until driving around 70mph again. It's fine running around town...