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Thread: LS Swap No Injector Pulse

  1. #1
    Potential Tuner
    Join Date
    Apr 2023
    Posts
    2

    LS Swap No Injector Pulse

    Hey guys,
    I have a very strange problem and I could use some assistance. I'm new to tuning.

    L92 with TSP stage 2 cam in 2017 Subaru BRZ with wiringspecialties harness t56 trans. I cannot get it to start, but it does run on starting fluid. No injector pulse.

    No DTCs
    Disabled VATS and starter Diag
    Triple checked grounds
    12v with key on at all injectors
    VCM scanner shows injectors firing 150 ms pulse width
    60 PSI at rail

    I have tried:
    two PCMs
    two MAP sensors
    two crank sensors
    two cam sensors

    I'm going crazy here. Any help would be greatly appreciated. I have contacted wiringspecialties but they insist that their harness is tested and not the problem.

    Tune and log attached.
    brz3.hplbrz.hpt

  2. #2
    Tuner in Training
    Join Date
    Jun 2018
    Location
    Franklin NC
    Posts
    35
    Check make sure cam sensor is wired correctly. I had same problem few months back. Wiring harness builder had cam, maf and something else wrong.

  3. #3
    Potential Tuner
    Join Date
    Apr 2023
    Posts
    2
    Good thought. I'm getting 5V on A and C and B is ground which should be correct. MAF seems to be wired correctly too.

  4. #4
    Senior Tuner
    Join Date
    Nov 2017
    Posts
    1,567
    I would check all the wiring in relation to the injector circuit. I think the 150ms pulse is telling the injectors to fire, it's not getting to the injectors or they don't have power to them.

  5. #5
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
    Location
    Meridian MS
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    7,948
    ECM: 7E8, CAN - E38, GM Gen4 V8
    VIN: ? u u a a a ?
    Serial: ? F > > ( ? ?
    Uh, what?

    Has a P0108. And MAP is 122 kPa while cranking. Unless you are submerged in ~7 feet of seawater, this is not correct.

    Does MAP go low if you unplug the sensor and short SIGNAL to GND?