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  1. #1

    Default frankenstein van no injector pulse

    After getting my engine swap complete, I have no injector pulse. Have power to the injectors, have spark, have fuel pressure. Just no pulse. I know the computer is/was good when pulled from the donor vehicle. My gut is that computer isn't receiving signal from the dist (not reading rpm) and therefore not firing the injectors. Will be building a datalogging harness shortly to see if engine RPM is being read, as well as testing sensors. Any suggestions are appreciated.

    Engine/computer is an OBD1/TBI setup from a 92 GMC Yukon 5.7L
    1986 Chevy G20 Tow Rig - 5.7 TBI conversion
    1978 Mustang II King Cobra Road Racer - Holley 650, MSD 6AL, 5 speed, 10 point Roll Cage, 9" posi, fuel cell, custom interior.

  2. #2


    got ahold of diagnostics manual info, hooking a test light clip to 12v, and tapping the purple/white wire on the 4 pin dist harness with the probe (IC Reference High), it should create a test signal and fire the injectors. Hoping to test it tonight, if the weather isn't too bad.

  3. #3


    well apparently was just a bad connection on the harness into the distributor. The diag test yielded injector firing properly, and upon reconnection had injector pulse! Nice when it's an easy fix

  4. #4

    mfleetwood's Avatar
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    Jul 2010
    Denver, CO
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    Nice!! It's great hearing about those "easy" fixes.

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
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