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Thread: E38 SD tune help

  1. #1
    Tuner in Training
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    E38 SD tune help

    2008 Pontiac G8 GT fbo, 229/244 .615"/.595" 113+4 cam, 3600 stall
    First attempt at trying a SD tune on my car and I'm having a little trouble. The numbers are all over the place which I figured they would be but I can't get the P0103 code to go away. I have it set for MIL on first error but I am still getting a CEL. When I clear the light the car does not run right at all and goes super lean and then goes into a protection mode... What am I missing or what do I need to do differently?
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  2. #2
    Tuning Addict 5FDP's Avatar
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    P0103 means it's in speed density, that is suppose to happen. That is exactly why we set the 3 MAF dtc's to MIL on first error and have the MAF fail high hz settings at a very low value.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training
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    Are the other 2 DTC's P0101 and P0102?

  4. #4
    Senior Tuner Lakegoat's Avatar
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    yes
    2000 Camaro SS 2015 L83 port injected, Whipple 3.0, 4L80E, 8.8 Ford
    2013 Silverado 5.3, 6L80k 8.8

  5. #5
    Advanced Tuner
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    You're supposed to get a CEL in SD mode. Why not tune it in MAF, tune the SD and then have it in blended mode until 3000 or 4000 RPM? It will run a hell of a lot better.
    Daily Driver= 2003 BMW 330xi
    Weekend Cruiser= 2009 Pontiac G8 GT (Vararam, TSP LS3 N/A Stage 1, OBX, CTS-V converter, MagnaFlows w/ J-Pipes, 160 t-stat)
    Project Car= 1991 Chevrolet Camaro RS (LQ4 w/ Gen 4 Rods, LS3 heads, turbo...)
    Truck= 2007 Chevy Silverado 1500 LT LY5 4x4