Question about 2004 Jeep Wrangler

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Code scan: P0301 Cylinder 1 misfire detected

2004 Jeep Wrangler 2.4 liter. about 36,000 miles.the engin malfunction light came on. went to Checker auto an used their code machine. Code P0301, what does this mean and how can I fix it? I had the spark plugs changed recently, could some bit of dirt fallen in and clogged it?

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  • Anonymous Mar 15, 2014

    P0301 CYLINDER 1 MISFIRE

  • Anonymous Mar 25, 2014

    P0301 cylinder 1

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Code P0301 is a generic OBD Code for Misfire. It also indicates you have a misfire in the #1 Cylinder. I would start by checking the plug wire to make sure its clean and on all the way (at the coil as well). Then if that doesnt help I would pull the plug out and check the condition of the spark plug. hopefully this will give you some direction. Thanks for Using FixYa!

Sincerely,

JC

Posted on Dec 03, 2008

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1 Answer

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1 Answer

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Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
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More info required to help you.

PLease vote if you liked this response

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