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Thread: Slight stumble warm start

  1. #1
    Junior Member
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    Jan 2015
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    Default Slight stumble warm start

    Hello I have an LS1 B pcm on a 98 Chevy truck with the l31 engine. I've been adjusting warm start, 168F plus. The Truck always started well but I'm just looking for a louder/ more solid start. I've adjusted startup air which now makes the truck hiccup when starting. I've lowered initial fuel prime and cranking fuel which helped but still not quite there. Anything else worth looking into?

  2. #2
    Junior Member
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    Jan 2015
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    So for example, when the truck starts now, it fires, small miss then runs, rpms go up (startup air) then they come back down. Trying to make it so it starts at the higher rpm then comes down and eliminate this small hiccup/miss.

  3. #3
    Lifetime Member
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    What was wrong with it before? Mine was always spot on until I did the marine intake and blower.
    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.

  4. #4
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    Quote Originally Posted by Supercharged111 View Post
    What was wrong with it before? Mine was always spot on until I did the marine intake and blower.
    There was nothing wrong with startup before I touched anything.. I may just return everything to the way it was but I wanted to experiment first. I really like the way the new dodges start, loud at first then quiet down right away. I was just trying to get my truck to do that if possible.

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