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Thread: stumbles on cold start

  1. #21
    Tuner K Rob's Avatar
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    Well I applied the changes and now the car wont start :-(
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed

  2. #22
    Tuner K Rob's Avatar
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    had to use the pedal to start it
    Attached Files Attached Files
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed

  3. #23
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    Just checking are you running factory injectors?

  4. #24
    Tuner K Rob's Avatar
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    No I am not
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed

  5. #25
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    Well then that makes a lot more sense lol. That mod wasn't listed in the first post, but I still should've asked sooner. Give me the part number please.

  6. #26
    Tuner K Rob's Avatar
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    It?s the white injectors from Grand Prix GXP. 42lb

  7. #27
    Tuner K Rob's Avatar
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    Stock short block LS1
    TEA light ported Trick Flow 220s
    64cc chamber (10.5:1)
    BTR stage IV cam 233/248 .630/.615 111.5+2.5
    92mm intake and throttle body
    E85 42lb injectors and Racetronix 255 pump, with hotwire kit.
    Kooks 1 7/8 headers 3 inch collectors. 3 inch y pipe to 4 inch Mufflex exhaust Magnaflow muffler.
    Th400 reverse manual valve body. With trans brake.

  8. #28
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    It'd be easier if you would read off the part number.

    The GTP had 42lb (@4 bar) white injectors. Are you sure it's the GXP not GTP?

  9. #29
    Tuner K Rob's Avatar
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    I apologize - 24508208
    Thank You for your time !!!!

  10. #30
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    Here you go. Every change applied up to this point (cranking VE, OL EQ table, SD mode) plus:

    Engine>Fuel>General
    Engine>Fuel>Transients
    Engine>Spark>Advance>Cranking

    Idle RPM back up since, after re-reading, you put on an underdrive pulley. Have to keep the voltage up.

    Clear fuel trims with VCM Scanner>Diagnostics & Special Controls. Flash the tune. Run it and get a good log of fuel trims.

  11. #31
    Tuner K Rob's Avatar
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    Copy that - Thank You once again for your help !!!!!
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed

  12. #32
    Tuner K Rob's Avatar
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    Current log
    Attached Files Attached Files
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed

  13. #33
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    Are you sure that's the tune I uploaded? Looks like it's still trying to idle around 750, and the fuel trims are the same as before.

  14. #34
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    I believe so - I will try again in the morning - I thought it was struggling to idle as well as rich as usual.

    Thanks !!!!

  15. #35
    Tuner K Rob's Avatar
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    2 logs - 1st one cold start
    2nd is cruising

    Thank You for your time and patience !!!
    Attached Files Attached Files
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed

  16. #36
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    Let's see what happens with this:

    VE
    Idle Spark

    Be sure you're resetting fuel trims after flashing a tune. There's LTFT reset, but to the right of it is regular fuel trim reset On/Off.
    Attached Files Attached Files

  17. #37
    Tuner K Rob's Avatar
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    Okay - great Thank You will do

  18. #38
    Tuner K Rob's Avatar
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    Updated log
    Attached Files Attached Files
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed

  19. #39
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    Alright here's updated VE.
    Attached Files Attached Files

  20. #40
    Tuner K Rob's Avatar
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    Good morning and Thank You !!
    2009 Pontiac G8 GT - VCM otr intake, underdrive pulley, Kooks LT's no cats to Kooks mufflers, LS7 maf, 3.45 gears, stall, cammed
    2014 Chevy SS - Rotofab CAI, LS7 maf, Kooks LT's no cats to factory mufflers, flex fuel sensor, cammed