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Thread: Code 307

  1. #1

    Default Code 307

    I have a 99 Silverado with a 4.8, code reader tells me cylinder 7 misfire.
    New plugs same problem. Can I swap the coil from another cylinder to see if the problem follows the coil?
    2010 Silverado LT 1500 Extended Cab 4X4 Vortec 5.3L 6 Speed Auto Z71 Package...All Stock

    1999 Silverado LS 1500 Extended Cab RWD Vortec 4.8L 4 Speed Auto...Work in progress.

  2. #2


    That's usually the first thing I do.

  3. #3
    murdog94's Avatar
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    Feb 2008
    Cloquet, Minnesota, United States
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    Ditto on my end... Also the misfire could be a fuel injector as well.


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  4. #4


    I'll give it a try and let you know what's up.

  5. #5

    Thumbs up

    yes common problem with rust in the fuel system!

  6. #6


    The coil and wires made no difference so I pulled the injector tonight full of dirt and rust. I'll see if I can find a replacement tomorrow.
    Last edited by Tony Arms; 10-16-2010 at 11:07 PM.

  7. #7


    Ordered a new injector I'll be able to put it in tomorrow. Does anyone know if you need to refil the fuel rails with fuel before you start the truck ?

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