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Thread: Throttle follower/ cracker question

  1. #1
    Junior Member
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    Jul 2007
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    Default Throttle follower/ cracker question

    Ok here it goes ... Am having a hell of a time tuning the throttle cracker . 98mm tb LS3 manifold/injectors, 6.2 w/ L92 heads. 2002 ecu LS6 base tune(2002 vette) 6 speed manual
    Runs great! except when I put in the clutch ( yes it has a switch that registers with the ecu, verified w/ tech2). The car wants to idle @ 2000 rpm. I can raise the crack on/off speed and turn it off but would like the clutch application to do that instead of the speed parameter. HOW? I would really like to have the increased engine speed as it acts as low rpm cruise control . the throttle is very touchy @ low rpm ( cam specs Im sure.) RPM is too high w/ clutch depressed slowing to a stop.
    How does the pcm know when the car is in gear vs. p/n?
    I built the harness myself so I could have left out an important circuit.
    Any help is appreciated.

  2. #2
    Joe (Moderator) joecar's Avatar
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    Apr 2003
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    27,887

    Default

    The PCM reads a clutch pedal position switch...

    clutch pedal in = corresponds to the P/N state
    clutch pedal out = corresponds to in-gear state

  3. #3

  4. #4
    Junior Member
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    Default

    thanks for the info. Lot to digest, but very helpfull.

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