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  1. #1
    Jr. Apprentice
    Join Date
    Oct 2012
    Location
    Princeton, NC
    Posts
    14

    Default 1996 k1500 4x4 5.7 automatic misfire mystery

    I have never posted for help on a forum before........but I am at the end of my rope.

    Multiple random misfires on random cylinders under load.

    I have installed new:
    Cam Position Sensor
    Crank Position Sensor
    Distributor cap and rotor
    Plug wires
    Spark Plugs
    Catalytic converters
    All O2 sensors
    Fuel pump and sending unit
    Fuel filter
    MAF sensor
    Air temp sensor

    I haven't had the truck long.....not even long enough to get inspection and tags. I drove it for 70 miles Friday afternoon without incident.....later that evening the misfiring started.

    No codes. Seems like it is losing current....the reason I say this is because without disconnecting the battery the clock on the radio resets randomly.

    PS: no miss at idle no matter what rpm.

    Any input would be greatly appreciated.

    Thanks,
    Randy
    Last edited by Randy_H; 10-07-2012 at 11:30 PM.

  2. #2

    Default

    Seems like it is losing current....the reason I say this is because without disconnecting the battery the clock on the radio resets randomly.
    I've had similar problems that I traced to a loose connection at the battery post. Grab a wrench and quickly check to make sure those connections are clean and tight.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3

    Default

    What kind of plugs and wires did you use?
    "It went together didn't it? Well then there has to be a way to take it apart!" - Me.

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    "The true measure of a man is how he treats someone who can do him absolutely no good." ~Samuel Johnson (1709-1784)

  4. #4
    Jr. Apprentice
    Join Date
    Oct 2012
    Location
    Princeton, NC
    Posts
    14

    Default

    Quote Originally Posted by MrShorty View Post
    I've had similar problems that I traced to a loose connection at the battery post. Grab a wrench and quickly check to make sure those connections are clean and tight.
    I will try this in a few.....I didn't even think of that.

    - - - Updated - - -

    Quote Originally Posted by moogvo View Post
    What kind of plugs and wires did you use?
    omni pro OE wires (don't know much about them took Oreilly's advice)
    acdelco iridium (every chevy I have had spark knocks without ACDelcos)

  5. #5
    Jr. Apprentice
    Join Date
    Oct 2012
    Location
    Princeton, NC
    Posts
    14

    Default PS: cam retart at 0

    PS: cam retart at 0

    just thought I would add that info.

  6. #6

    Default

    I don't know anything about omni pro wires other than that I wouldn't use them. you need to use AC Delco wires. If you can't find them, you can use Borg Warner (BWD) wires. I have had good luck with those. Get a good set of wires and go from there. I can't begin to tell you how many times I replaced plug wires with something other than AC Delco or BWD and the problem didn't go away. The guys at Advanced O'Reilly Zone stores don't have a clue! You'd be better off buying the OPPOSITE of what they tell you most of the time!

    PS: cam retart at 0
    What do you mean by that? Did you adjust the timing? After 1996 you can't adjust timing without a scantool... Just so we are both on the same page... Input from the knock sensor (among other things) tells the ECM how much to advance or retard the timing. Yes, base timing is 0*, but you can't set the base timing with a timing light. you have to use a scan tool.
    "It went together didn't it? Well then there has to be a way to take it apart!" - Me.

    Check out my image gallery HERE.



    "The true measure of a man is how he treats someone who can do him absolutely no good." ~Samuel Johnson (1709-1784)

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