I have a 2002 Jeep Liberty 3.7L, 6 cyl, 4wd Auto. With 170,000 miles my Jeep is idling very rough at start up. If I let it run for 15-20 minutes, turn it off, then start it up again after waiting 30 secs, it usually runs smoothly and can last up to 30 miles. If I turn it off and let it sit for more than 30 minutes, it will start idling rough again and stall when I slow to a stop. I have a had a vacuum leak repaired, fuel injector replaced and all of them cleaned, one coil replaced, spark plug wire for 6th cylinder replaced, internal computer module replaced, right side oxygen sensors replaced, complete carbon flush and compression is good. Diagnostics tell me that the 6th cylinder is not firing as it should be. I am trying to find out what else could possibly cause the 6th cylinder to not be firing as it should.
Wednesday, October 10th, 2018 AT 4:47 PM