Question about 1998 Jeep Wrangler

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Engine keeps missing. unknown codes

1998 jeep wrangler 2.5L 4cyl check engine light is on codes 1682 1391 0320 engine has been misfiring alot

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  • cnp326 May 10, 2009

    no i havent. and i have no idea how to do it. i normally do my own work so is this something that i can do with common tools or is it something i should just break down and have a machanic check?

  • Steel Moore May 11, 2010

    Have you check the timing? Both for ignition and valve.



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Code 1682 indicates low battery voltage. This could be a problematic alternator, which would likely cause misfiring. Autozone should be able to check this for you for free.

Code 1391 indicates the computer can not see the crank or cam sensor signal. This would likely be a result of the misfires.

Code 0320 indicates the crankshaft position sensor reference signal could not be found while the engine is cranking.

All of these issues point to either a cam/crank sensor malfunction or a charging system problem, either or both of which could cause the misfiring.

Posted on Sep 06, 2009


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