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Old 06-19-2012, 09:08 PM   #1
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Engine light terror

So I cranked the jeep this morning drove 7 hrs and just cranked it again.... after a very sluggish idle it threw a check engine light... no where is open to get it read.. I'm thinking O2 sensor or EGRESS valve... any other ideas?

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Old 06-19-2012, 09:10 PM   #2
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Turn your ignition key on-off-on three times within five seconds and after the third time, leave it in the On position. Wait. With a short period of time after the diagnostic test runs, you'll see any diagnostic codes it found showing up in your odometer. Four digits after a 'P' like P1234. Write them down and let us know what they are.

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Old 06-19-2012, 10:14 PM   #3
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P0303
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Old 06-19-2012, 10:18 PM   #4
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P0303 (M) CYLINDER #3 MISFIRE Misfire detected in cylinder #3.

Check that your coil rail's rubber boot is properly positioned over the #3 spark plug. If it is, remove & check the #3 spark plug.

If you have replaced your spark plugs, exactly what brand and model of plug did you install?
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Old 06-19-2012, 10:18 PM   #5
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Misfire on cylinder #3
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Old 06-19-2012, 10:29 PM   #6
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Cylinder 3 misfire... its running fine now .. not missing at all. Probably just really hot from the long drive.. ill check the plug wires tomorrow and plugs.. thanks tho I didn't know about the ignition thing
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Old 06-19-2012, 10:33 PM   #7
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Lol sorry phone didn't update.. no I just bought the jeep about 3 months ago... ill probably change plugs and wires though now... Any brand suggestions
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Old 06-19-2012, 10:48 PM   #8
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Good choices include Autolite APP985, Autolite XP985, or Champion 7034. The XP985 is iridium, the other two are dual-tipped platinum.

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