I have a 2002 TJ with 153,000 miles on it.
Full tune up in winter 2017.
One month ago the jeep was running so rough and multiple codes came up: P0320, P0300, P0301, P0306.
I took the jeep to a local mechanic - he was unable to diagnose and suggested the jeep dealer. The jeep was at the dealer for 1 month.
Fixes included ignition coil, crank sensor, all of the plugs replaced, injectors switched around and cleaned, replaced the injector O rings, checked gas tank and fuel pump and filter. Ran the jeep for long drives and the P0301 misfire code continues to come on -missing slightly they say. They have had 5 techs and a foreman review it and are stumped. They said that everything checks out fine and perhaps its an engine internal error. I have it home now and the light just came back on.
What else can I check that the certified mechanics could miss? Bad, loose, cracked fuel cap? Bad battery? Suggestions please! I have spent hours and hours trying to figure this out.
Thank you!
Full tune up in winter 2017.
One month ago the jeep was running so rough and multiple codes came up: P0320, P0300, P0301, P0306.
I took the jeep to a local mechanic - he was unable to diagnose and suggested the jeep dealer. The jeep was at the dealer for 1 month.
Fixes included ignition coil, crank sensor, all of the plugs replaced, injectors switched around and cleaned, replaced the injector O rings, checked gas tank and fuel pump and filter. Ran the jeep for long drives and the P0301 misfire code continues to come on -missing slightly they say. They have had 5 techs and a foreman review it and are stumped. They said that everything checks out fine and perhaps its an engine internal error. I have it home now and the light just came back on.
What else can I check that the certified mechanics could miss? Bad, loose, cracked fuel cap? Bad battery? Suggestions please! I have spent hours and hours trying to figure this out.
Thank you!