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Hot misfire problems..

Discussion in '3rd Gen Builds (1996-2002)' started by laynez22, Nov 9, 2024.

  1. Nov 9, 2024 at 4:25 PM
    #1
    laynez22

    #1
    laynez22 [OP] New Member

    Joined:
    Nov 9, 2024
    Member:
    #43906
    Messages:
    1
    Gender:
    Male
    First Name:
    Layne
    Vehicle:
    Black 96 4runner
    I have a 96 4Runner. 213k miles. 3.4L. Misfire p0303 and p0171.

    First started with p0303 and was only misfiring when hot and driving around 50-60mph. I got new spark plugs, changed the coil in cylinder 1 and 3 to see if the code would move and made sure the wires were good.

    Drove it that day no codes or misfires after all the repairs until it was hot again and was within about 20mins. (I had cleared the codes). Scanned it again to a p0303, so I knew it wasn’t the coil. Did some research to see what else it could be.

    Saw injectors could be the problem. Replaced the injectors and codes cleared. I let it run till hot, no misfires. Turned it off and started it again no misfires. Drove it for about 20 minutes and it started to misfire (at freeway speeds). Code was p0171 for the maf. Cleaned the maf and got a new air filter. The p0171 code cleared but p0303 is back

    So pretty stumped and would love some help. Thanks!
     
    laynez22, Nov 9, 2024
    #1
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