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misfire?

This is a discussion on misfire? within the General Help forums, part of the LSx Technical Help Section category; I changed my spark plugs and everything seems to be right but im getting a misfire p0300 and I cant ...

  1. #1
    Junior Member
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    1999 Trans am

    misfire?

    I changed my spark plugs and everything seems to be right but im getting a misfire p0300 and I cant find out which cylinder is misfiring what could cause it to misfire? help.
    my car!!!

  2. #2
    Junior Member
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    1999 Trans am

    the spark plugs were ngk tr-55-ix

  3. #3
    United States Marine Kamauxx's Avatar
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    Blazen Orange Metallic
    2006 GTO

    I just found out today that if you get a MAF sensor code it can read as a misfire, and the MAF sensor code can be caused by low voltage, in my case, I needed a new battery.

    So, one minute I had a bad MAF sensor, and misfiring codes, 60 dollars and a new battery later, nothing.

    This was on a 2000 Grand Am though.

  4. #4
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    were you getting misfires before the plug swap? If not I would really go over the boots of the wires and make sure A) that they're on tight and B) that you didn't damage one pulling it off the old plug. How many miles are on your wires?

  5. #5
    Life in the Fast lane sunsetorangess's Avatar
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    Met. Sunset Orange
    01 SS

    Did you check the gap on the plugs?
    Like Orion said, check your wires to ensure you didnt damage any and make sure they are all on tight.
    J
    2001 SS, Its not the car its the Driver that matters....

  6. #6
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    1999 Trans am

    well the wires are fairly new like 1000 miles on them there msd wires. and i never messed with gap on the plugs pulled them out of the box and put them in but i did check the length of the plug compared to stock and there a hair longer.

  7. #7
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    2013 Infiniti G37

    Always check your plug gap before putting them in.

  8. #8
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    have you made sure the boots all "clicked" into place? Mine can be a real bear sometimes getting both ends to snap onto the plug or coil. They feel like they went all the way on but in fact they didn't. You never did say if this happened before or after you swapped the plugs.

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