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Thread: Stumble off idle, closed loop

  1. #1

    Stumble off idle, closed loop

    Lately, anytime I pull away from the stop light aggressively I get some hesitation then a second later it accelerates, like it stumbled then surged. I increased my enrichment ratio and made the lower rpm PE ratio match the higher rpm ratios. Drove the car this morning and I thought the issue was fixed. After work, when the car was fully warmed up (probably near 100* outside, IAT's around 130) it seemed much much worse. If I took off very gently it would be fine, but otherwise taking off from a light met with at least a 2 second long stumble. After this, the car seems to drive just fine.

    Kind of at a loss on what to look for. I don't drive the car a whole lot, so I'm not sure if this is worse when its hot out, or just a coincidence.
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    2008 G8 GT / TVS1900 /2.9 pulley / LS9 Injectors/ LS9 Cam / Catback / Intake

  2. #2
    Do you have a log of the hesitation when it occurs?