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Thread: 5.3 LS swap won't stay running

  1. #1
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    Default 5.3 LS swap won't stay running

    I had a racer swap a 5.3 in place of a blown up carb'd 350 and it doesn't seem to want to stay running. It started as a truck 411, so I just did a full flash of a 2002 Camaro 12212156 OS from the repository and deleted emissions. If i flash it it fires right up no problem and stays running and you can drive it on and off of a trailer. The 2 times he attempted to go out on track, it died before he could get from grid to the racing surface. From there on out, it'll start and die just as if the anti-theft weren't turned off. To make it run again, just reflash the same tune on and it fires right up. It is a returnless LS1 fuel rail and he initially dead headed the pump thinking that the dampener was the regulator. He ran to the parts store and picked up a Corvette FPR and hooked that all up under the car and it was still pulling this shit so I flashed his PCM for a corrected IFR to match the truck injectors he was running. This is a bone stock 02 F-body tune with emissions deletes, we're not allowed to play with fuel or timing in this class. I'm wondering if there's something else I missed in the tune? The motor is in a 3rd gen Camaro with a T5 trans. I've attached the current tune.

    Matt Tune With 5.3 Injectors_0000.ctz

    As you can see, I finally caved and updated to the latest software.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  2. #2
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    If my description of the issue is lacking, please let me know whatever else I can provide.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  3. #3
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    Quote Originally Posted by Supercharged111 View Post
    As you can see, I finally caved and updated to the latest software.
    I haven't yet, so I can't look at your tune file.

    Does it throw any codes?

  4. #4
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    Just a turn signal code and fan control codes. I enabled fans for him in case he decides to run them off the PCM in the future.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  5. #5
    Joe (Moderator) joecar's Avatar
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    Log file...

  6. #6
    Lifetime Member THEFERMANATOR's Avatar
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    Quote Originally Posted by Supercharged111 View Post
    Just a turn signal code and fan control codes. I enabled fans for him in case he decides to run them off the PCM in the future.
    With a camaro OS, you will have to wire in a resistor for the ac pressure sensor. Tbe Camaro OS will default the fans on low all the time without an ac pressure sensor. I would switch back to a truck OS if it was mine. Then the fans will work via temp without ac.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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    Unfortunately the car is over an hour away so kinda tough to get a log right this minute. What I'm mostly after is what sorts of things bite people in the ass when they do these swaps. I think wiring is a big one and I have grilled him on the accessory, ignition, and start power connections. He was apparently able to do a burnout at a car show which is leading me to believe that the problem may be less component related and more of the intermittent fault variety (so. . . wiring).

    Fermanator what kind of resistor is required for this? I'll be doing the same swap to my Camaro at some point and it will be so nice to have OBDII and the crap to alter the tune myself.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

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