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Help with 3rd gear problem - A4 99 T/A

This is a discussion on Help with 3rd gear problem - A4 99 T/A within the Automatic Transmission forums, part of the Drivetrain category; Over the weekend I began to notice a problem in 3rd gear under light throttle. When I accelerate the car ...

  1. #1
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    Help with 3rd gear problem - A4 99 T/A

    Over the weekend I began to notice a problem in 3rd gear under light throttle. When I accelerate the car shifts into 2nd, 3rd, 4th very crisply - I have always suspected that I had a shift kit but have not way to confirm this. However, right after the car shifts into 3rd gear the torque converter locks up and the rpms drop a little (at least it seems this is the case). If I continue to maintain the same light throttle and as my speed continues to increases the car either loses 3rd gear for a second or the torque converter unlocks, I can't tell which. It only does this for a split second in 3rd gear and then everything else works like it should and it will make the 4th gear shift. It only does this under light throttle and in the middle of 3rd gear. The car runs and drives great and will grab rubber in 2nd gear under heavy throttle.

    Any ideas or suggestions?

  2. #2
    Junior Member griftymcgrift's Avatar
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    medium blue metallic
    99 Trans Am

    me TOO

    mine does the same exact thing, but in second, and i CANNOT figure out why.. i think im gonna save up for a Performabuilt, but i dont want to have to....haha

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    Member performabuilt's Avatar
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    You need to data log it and see whats happeing , I suspect lockup is disablig just before the 3-4 shift, Which may be normal in the tuning , You can watch a scanner or data logger to determine this to be true

  4. #4
    Junior Member griftymcgrift's Avatar
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    medium blue metallic
    99 Trans Am

    ok

    how and where would i aquire a data logging device?
    is it like an HPtuner?

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    Member performabuilt's Avatar
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    Yes they can do that and so can a snapon scanner

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    Junior Member griftymcgrift's Avatar
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    medium blue metallic
    99 Trans Am

    now i wish i had either, but im low on funds. can this hurt the tranny or is it mainly an annoyance?

  7. #7
    Member performabuilt's Avatar
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    No its actually likley some normal part of the programing but I cant actualy feel it so itis a guess But I dont think its a problem

  8. #8
    Junior Member griftymcgrift's Avatar
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    medium blue metallic
    99 Trans Am

    hey thanks a lot Performabuilt. i swear...when my trans goes....your who ill be calling

  9. #9
    Junior Member griftymcgrift's Avatar
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    medium blue metallic
    99 Trans Am

    try this

    it may sound insane... but get some MAF cleaner and some elec contact cleaner, take off the MAF, spray it w/ MAF cleaner, and all the plugs to the trottle body. take them off and spray them w/ elec cleaner. disconnect the battery before you start and reconnect it at least 10 mins after your done. i did it and it feels fixed. i think the different sensors were throwing the trans off. let me know if you do and how it goes...

  10. #10
    Member performabuilt's Avatar
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    It is tru the MAF plays a role in transmission funtion as do other engine sensors and are often not considered, A MAF sensor becoming dirty or oily can actually not only affect transmissions and engine performance, But can result in transmission failure.

  11. #11
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    in his tune, i increased the TCC Duty Cycle. min = 60 max = 100. i zero'ed out the Torque Reduction Normal table.

    most likely, it's the sudden release of the lock up just before the 3 to 4 shift.

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