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  1. #1

    Default Cylinder 5 Misfire

    OK, first I would like to start off by saying thanks to all those that have helped me with answers when I posted up questions.

    Now, on my 98 Chevy C1500 (350) I am getting a misfire code for cylinder 5. I am nearing the end of the work that I have done on this truck, I feel this is the only thing that is holding me back.

    The parts that I have replaced since I have inherited this truck:

    spark plugs
    cap
    rotor
    wires
    ignition coil
    ignition module
    fuel pump
    fuel pressure regulator
    coolant temp sensor
    oil pump
    egr valve
    pcv valve
    O2 sensor (2x) (before cat)
    belt
    belt tensioner
    battery
    starter

    I highly doubt any of these can cause a misfire, but who knows? Also, what is the idle suppose to be set at? The idle jumps, but i'm pretty sure it's cause of the misfire, would adjusting the idle help?
    Please, please, please, if anyone have any good ideas or suggestion please share it, I"ve been waiting a long time to drive this truck.

    Thanks

  2. #2

    Default

    you may have a bad plug or wire try swapping the plug to another cylinder and see if the code follows if it does then you found your problem if it stays swap a wire and see what happens

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  3. #3

    Default

    Looks like you have changed everything but the injector. ;)
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  4. #4

    Default

    I'm crossing my fingers that I don't have to replace them. I've ran out of money for this project so if it is, then it's going to have to wait.

  5. #5

    Default

    Pay close attention to the routing for #5 and #7 plug wires. If they run parallel it is possible for #5 to induce a spark into #7 and that would be very early on its compression stroke. These wires should cross at 90 degree angles when needed and be seperated a bit when they have to run close to each other. For a test try taking wire #5 out of the looms and run it way away from the others.

  6. #6

    Default

    I have the same thing but #1 and the last time it was the intake gasket was blown out. I am going to start digging into mine tomorrow.

  7. #7

    Default

    get yourself some starting fluid and spray the area where the intake meets the heads and if your rpm's go up like you just pressed on the pedal then you got an intake leak and need to do them lower gaskets

  8. #8

    Default

    Thanks guys, I'm try this stuff out today!!!

  9. #9

    Default

    I was short on time yesterday, so I only had time to do the wire situation, yeah that didn't work. So, I'm left trying to find a vaccum leak.

  10. #10

    Default

    Quote Originally Posted by philosofy1 View Post
    OK, first I would like to start off by saying thanks to all those that have helped me with answers when I posted up questions.

    Now, on my 98 Chevy C1500 (350) I am getting a misfire code for cylinder 5. I am nearing the end of the work that I have done on this truck, I feel this is the only thing that is holding me back.

    The parts that I have replaced since I have inherited this truck:

    spark plugs
    cap
    rotor
    wires
    ignition coil
    ignition module
    fuel pump
    fuel pressure regulator
    coolant temp sensor
    oil pump
    egr valve
    pcv valve
    O2 sensor (2x) (before cat)
    belt
    belt tensioner
    battery
    starter

    I highly doubt any of these can cause a misfire, but who knows? Also, what is the idle suppose to be set at? The idle jumps, but i'm pretty sure it's cause of the misfire, would adjusting the idle help?
    Please, please, please, if anyone have any good ideas or suggestion please share it, I"ve been waiting a long time to drive this truck.

    Thanks
    i have a question is the miss consistent or is it random

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