code 301 on a 2007 jeep wrangler unlimted X 2wd

25

Asked by Scott May 31, 2017 at 12:15 AM about the 2007 Jeep Wrangler Unlimited X RWD

Question type: Maintenance & Repair

code 301 on a 2007 jeep wrangler unlimted X 2wd

3 Answers
10

Mike answered 7 years ago

Said to be cylinder misfire fault detected. Look into your spark plugs and spark plug wires and see if their would be any reason for a bad connection

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Rowefast answered 7 years ago

P0301 JEEP - Cylinder Misfire Fault Detected...Possible causes: Faulty spark plug 1, Clogged or faulty fuel injector 1, Faulty ignition coil 1, Fuel injector 1 harness is open or shorted, Fuel injector 1 circuit poor electrical connection, Ignition coil 1 harness is open or shorted, Ignition coil 1 circuit poor electrical connection, Insufficient cylinder 1 compression, Incorrect fuel pressure, Intake air leak...The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 1. If the problem persists more tests needs to be done to diagnose problem.

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schalk answered 7 years ago

Also do a compression test. I've read low compression can cause it. May have a bad valve spring.

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