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Thread: 87 shortbed 5.3 vortec not cranking

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  1. #1
    Join Date
    Aug 2008
    Location
    mansfield texas
    Posts
    3,512
    Niiice lets see pics man!

  2. #2
    Join Date
    Jan 2011
    Posts
    20
    I will get pics up and/or a video. I got the fuel pump functioning as it should. prime for 2 sec when key is turned and on while running. The last problem i seem to be having trouble chasing down is my cpu has to be hooked directly to a 12 volt source at all times otherwise it will not work. Any sugguestions on this? Ive tried hooking it up to my ignition switch but no luck. it willcrank but no power from the PCM. I tried a couple other switched igniton sources( 12 volts with key turned) and none seem to work.

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