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Thread: truck wont start

  1. #31
    at the connector to the coil harness i got 12.4 volts at the pink wire and while cranking the other ones jumped around but never got over.2 volts

  2. #32
    Join Date
    Aug 2008
    Location
    North Texas
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    12,078
    Hook the coil signal wires to B+ through a test light and crank it to see if they all flash. Also check the ground wire to the coil plug on each side.

  3. #33
    what is B+ sorry im kinda a noob to fuel injection

  4. #34
    Join Date
    Aug 2008
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    North Texas
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    Battery positive.

  5. #35
    ok the ground is good no flashing light on the other wires

  6. #36
    oh i probably shoudve mentioned this sooner i have six wires that have no home my harness guy said i didn't need them to run but i wanted to make sure. they are white(im guessing tach?) purple, yellow, green/white, blue and brown/white. any of these causing my problem?

  7. #37
    Join Date
    Aug 2008
    Location
    North Texas
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    12,078
    No flashing means no signal to the coils to fire. Do you have a scanner or a way to check for cranking RPM to verify the CKP is working?

    Post a pic of the connector.

  8. #38
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    if you take the air cleaner tube off the throttle body, if you turn the key on do you see the TB reset the TB blade? It will open some and then reset to almost closed.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  9. #39
    Quote Originally Posted by GasGuzzler View Post
    No flashing means no signal to the coils to fire. Do you have a scanner or a way to check for cranking RPM to verify the CKP is working?

    Post a pic of the connector.
    no i have no scanner and my diagnostic isnt hooked up all the way ill try to do that today

    also the wires are just a random bunch coming from the harness

    Quote Originally Posted by RedHeartbeat View Post
    if you take the air cleaner tube off the throttle body, if you turn the key on do you see the TB reset the TB blade? It will open some and then reset to almost closed.
    yes and if i press the gas pedal with key on it opens

  10. #40
    Join Date
    Aug 2008
    Location
    North Texas
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    12,078
    Need to know where in the harness they come from and a pic would help a lot.

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