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99 TA has low idle after cumpter install.

This is a discussion on 99 TA has low idle after cumpter install. within the Computer & Tuning forums, part of the LSx Technical Help Section category; The small wire going to the alternator had no voltage coming from it, I was told by the dealer Tech, ...

  1. #1
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    pewter
    99 Trans Am

    Unhappy 99 TA has low idle after cumpter install.

    The small wire going to the alternator had no voltage coming from it, I was told by the dealer Tech, so I was told that the wire was burned inside of the cumpter, car now charging but idle is around 400rpms at startup and gets to 500 rpms after warming up, why I'm I having this problem? started after installing of new cumpter. Is it ecm or is it called a cumpter?

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    Junior Member wraith23's Avatar
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    Black
    2000 Trans Am

    well got a couple questions... did you/can you drive it after the install? and did you have the computer flashed?
    2000 Jet Black M6 Trans Am aka Kitte:
    SLP lid, cai kit, smooth bellows; Hawks HPS pads/slotted rotors; Centerforce D7X street/strip clutch; DDM HID conversion; Black w/ metal lip C5 Z06 replica 17x9.5 rims; free ram air mod; Bilstein HD shocks; LTs and ORY; Magnaflow quadtip catback

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    pajeff02's Avatar
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    '02 WS.6 / '07 Suburban

    Did they install a new, remanufactured, or junkyard PCM in your car?

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    99 Trans Am

    The PCM was put in at a dealership here so I would hope that they would have installed a new one, did they flash it I have no Ideal, what does flash means? yes I drove the car home but the IAC motor don't work anymore, have fire on one pin in the IAC wire not all four, didn't have this problem until dealer tech installed new PCM. they tried to cover this problem up by idling the engine up, why is there fire on only one pin and not all four? Can this plug be tested with a test light like I did or do I need some other devise to check it?

  5. #5
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    I would have to check the schematic to see what each wire's function is. My guess is that at least one wire is a 5V supply and another is a ground. The remaining two are probably the signal back to the PCM in volts.

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