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Thread: Engine wont stay running

  1. #1
    Join Date
    Mar 2013
    Location
    Edmonton, AB, Canada
    Posts
    133

    Engine wont stay running

    Im having issues keeping my engine running. It will start up fine but run for maybe 5 to 10 seconds. Im thinking its the injector pulses. I checked the hot side and its getting 12v. I checked between both leads and im getting 5.5v. I also checked the negative lead and positive from the battery and i get 12v. Any thoughts? Could it be a fryed pcm?(vats is tuned out)
    Any other possible reasons it wont stay running?
    I made a common ground for the harness on the driver side head by the ect sensor and from there grounded to the chassis. Do you think I need more grounds? Could that cause the issue im having?
    Any help would be greatly appreciated
    Back Alley Motorsports 98 GMC
    -5.3l LM7 bored to 5.7l Thompson Motorsports -72mm T4 Magnum Turbo
    -TU1 Custom Grind cam(spec speed.inc) -799 heads
    -.660" Trick Flow dual valve springs -Forged Probe Pistons 3.902" flat top

  2. #2
    check your fuel lines , also how many ground wire on your car ?

  3. #3
    Join Date
    Mar 2013
    Location
    Edmonton, AB, Canada
    Posts
    133
    Fuel lines have 60 psi. I have one ground from engine to frame and a few directly to the frame and some to the driver side head.
    Back Alley Motorsports 98 GMC
    -5.3l LM7 bored to 5.7l Thompson Motorsports -72mm T4 Magnum Turbo
    -TU1 Custom Grind cam(spec speed.inc) -799 heads
    -.660" Trick Flow dual valve springs -Forged Probe Pistons 3.902" flat top

  4. #4
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    Any codes? The Maf ?

  5. #5
    Join Date
    Mar 2013
    Location
    Edmonton, AB, Canada
    Posts
    133
    Maf is deleted. Ya MIL is on but i dont have a code reader. Ill see if i can borrow my buddies then post what codes are thrown later tonight.
    Back Alley Motorsports 98 GMC
    -5.3l LM7 bored to 5.7l Thompson Motorsports -72mm T4 Magnum Turbo
    -TU1 Custom Grind cam(spec speed.inc) -799 heads
    -.660" Trick Flow dual valve springs -Forged Probe Pistons 3.902" flat top

  6. #6
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    what about the air intake temp sensor?

    maf can be somewhat disabled in the tune but not permanently deleted; in order to revert to sd mode.

  7. #7
    Join Date
    Mar 2013
    Location
    Edmonton, AB, Canada
    Posts
    133
    I have the iat hooked up but i dont have the intake tube its in hooked up, cuz i dont want to push boost till i get it running.
    Last edited by shmiet; 07-29-2013 at 03:34 PM.
    Back Alley Motorsports 98 GMC
    -5.3l LM7 bored to 5.7l Thompson Motorsports -72mm T4 Magnum Turbo
    -TU1 Custom Grind cam(spec speed.inc) -799 heads
    -.660" Trick Flow dual valve springs -Forged Probe Pistons 3.902" flat top

  8. #8
    Join Date
    Mar 2013
    Location
    Edmonton, AB, Canada
    Posts
    133
    Just checked and its throwing codes as follows
    -P0102-MAF CIRCUIT SIGNAL LOW
    -P0200-INJECTOR CIRCUIT PROBLEM
    -P1637-GENERATOR L-TERMINAL CURCUIT

    MIL no longer present

    -checked injector balance-all pulsed and recorded pressure drop(atlesst thats what the scanner told me)
    Last edited by shmiet; 07-29-2013 at 09:53 PM.
    Back Alley Motorsports 98 GMC
    -5.3l LM7 bored to 5.7l Thompson Motorsports -72mm T4 Magnum Turbo
    -TU1 Custom Grind cam(spec speed.inc) -799 heads
    -.660" Trick Flow dual valve springs -Forged Probe Pistons 3.902" flat top

  9. #9
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    that 200 code needs to be fixed.

    maf code is from the sd tune, which is ok; and the maf not being present.

    if the alternator is charging, delete the code.

  10. #10
    Join Date
    Mar 2013
    Location
    Edmonton, AB, Canada
    Posts
    133
    I know im not getting enough Voltage to the injectors- drops to 8.5v. I have 2 separate banks one for drivers and one for passenger. I used 14 gauge to feed, Is that too much too little? Any other ideas? Thanks man
    Back Alley Motorsports 98 GMC
    -5.3l LM7 bored to 5.7l Thompson Motorsports -72mm T4 Magnum Turbo
    -TU1 Custom Grind cam(spec speed.inc) -799 heads
    -.660" Trick Flow dual valve springs -Forged Probe Pistons 3.902" flat top

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