GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 4 of 4
  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

    Default

    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

    Default

    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
    Legend


    mfleetwood's Avatar
    Join Date
    Jul 2010
    Location
    Denver, CO
    Posts
    7,213
    Blog Entries
    1

    Default

    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;
    TIRES:
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

Similar Threads

  1. 1990 305 no injector pulse
    By kcfocus1 in forum General Chevy & GM Tech Questions
    Replies: 1
    Last: 09-02-2010, 10:30 PM
  2. Turn Signal problem.. doesn't pulse..
    By Falcone in forum General Chevy & GM Tech Questions
    Replies: 4
    Last: 10-29-2009, 11:20 AM
  3. Will a 86 wiper motor w/ pulse board drop into my 92? (Sonoma)
    By Falcone in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 08-03-2009, 10:58 PM
  4. idle pulse
    By grog in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 04-14-2009, 08:00 AM
  5. Wiper pulse delay module
    By hunterdmg in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 08-24-2008, 03:14 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •