Question about 1998 Pontiac Bonneville

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Number 4 cyl misfire code and had a map sensor circut low code

Replaced map sensor,sprk plug,plug wire,coil and had icm test 8 times in a row. Is there some kind of fuse if something shorted? There are wires that lead to the icm that the serp belt was apparently rubbing on. I can see copper on the light blue with white stripe one and on a black one with a thin white stripe. They are not touching each other and no strands r broken. It was dragging a cylinder a couple weeeks ago but then ran fine a couple days later. Now its been doing it for a week. I also tried injector cleaner first. I layed the plug on the engine and ran it and didnt see a spark.

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  • garrett_herz Jan 06, 2009

    Not the sollution. already replaced that. I stated that in my initial post. i remedied the situation. thank you anyway.


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If you got no spark coming from cyl 4 ignition coil might be defective or ignition module

Posted on Jan 06, 2009

  • pierre laplante Jan 06, 2009

    to do a quick test mark the wire and change coil position if the coil number 4 is still not firing change that coil if you got another coil that not firing its our ignition module that gone pierre

  • pierre laplante Jan 06, 2009

    and seal does wire


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I would try to get those wires sealed because the current can still travel beetween then and cause mise fires on an alternative pole hope this could help you.

Posted on Jan 06, 2009

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Bad spark plug wire... quick test for it is to swap another spark plug wire in it's place.

Posted on Jan 06, 2009

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Just so I learn something

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