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Pcm Problems

This is a discussion on Pcm Problems within the Computer & Tuning forums, part of the LSx Technical Help Section category; Whenever I Turn The A/c On In My 99 Z28 The Engine Races To 2500 To 3000 Rpm So I ...

  1. #1
    Junior Member
    Join Date
    Jun 2007

    99 z28 camaro

    Question Pcm Problems

    Whenever I Turn The A/c On In My 99 Z28 The Engine Races To 2500 To 3000 Rpm So I Cant Keep It On For Fear Of Burning Up The Clutch. . Im 99% Sure Its The Pcm Because I Replaced The Iac Valve And Tps And It Still Dose It. The Kid Who Owned It Before Me Had A Power Programer And I Was Thinking Maybe That Burned Up The Pcm. . . Well Anyways My Queston Is If I Order A New Pcm Will I Have To Bring It To Chevy To Get It Programed Or Can I Just Plug And Go??

  2. #2
    Senior Member mrr23's Avatar
    Join Date
    Jul 2005
    orlando, fl

    dark bowling green
    2000 corvette

    you will have to have the PCM flashes for your car.

    do, this unplug the IAC and see if it still does it.

  3. #3
    Join Date
    Oct 2005
    I wouldn't think you need a new PCM--sounds rather extreme--all you need is a tuner to fix the A/C idle flare--Even if you bought a new computer you'd still have to pay to have a tune flashed into it---so just flash yours---There are about 25 tables that involve the A/C--In EFILIVE I would look at these tables 1st
    B4515 Airflow correction --A/C on in drive/A/C on in Park
    B4354 A/C airflow ramp in
    B4357 A/C-- IAT TQ loss/gain
    B4358 A/C TQ loss/gain correction
    B4370 A/C ETC Max correction

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