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2008 Nissan Altima Question: Why is #4 cyl misfiring after new plugs,coil. if I unplug 4 coil nothing happens

 

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Dad50, 2.5L 4 Cylinder, Columbia, MD, August 18, 2014, 08:03
 Rookie

It just started running rough. #4 plug was real black and gummy when I replaced it. Every so often there is blow by smoke when he starts the car. if I unplug any of the coils the engine nearly shuts off, but if I unplug #4 nothing happens. Is it the fuel injector?

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  • Answer #1

    pushrod August 18, 2014, 09:21
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     Master

    Compression reading was??... Noid light flashing when testing # 4 injector pulse??... # 4 coil actually producing spark when tested with spark tester???

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    Dad50, August 18, 2014, 09:37
     Rookie

    I'll have to get these checks done. Right now the check engine light flashes on and auto zone stated the code said #4 cyl is misfiring.

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    pushrod, August 18, 2014, 14:14
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     Master

    Yeah, got to do some more testing to get to the bottom of this one!... Start with the compression test.!... That's the main thing at this point!

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