Thread: Slipping issue/ rebuild?

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  1. #1 Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Just bought a 2003 aztek for $400 with a bad transmission. It was rebuilt by certified transmissions three years ago and it will upshift fine, but once you remove your foot from the gas, it completely disengages like it's in neutral. Once you come to a stop, it will engage again until you let off the gas again. Haven't dropped the filter yet but my guess is the torque converter which requires a full rebuild. Just wondering if anyone has come across this issue on a new rebuild. Only codes are rear o2 sensor and oil pressure switch which should be unrelated. There is some electronic issues associated with the bcm but shouldn't affect the transmission. Any advice is appreciated!
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  2. #2 Re: Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Bump
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  3. #3 Re: Slipping issue/ rebuild? 
    Donating Users moddman's Avatar
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    Brake switch? or aka BPP switch zeroing with a tech2 scanner? Try it and see if it helps.

    BTW:BPP switch zero calibration is in the BCM. Could be your problem.













    3.4" ZZP MPS Pull
    ey,ZZP Coupler,NGK PLUGS,L67 Coils,INTENSE 1.8 RR, Custom PCM Tune, ZZP Stage 2 IC, 180* T-Stat, 42LB RE-FLWD Inj.
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  4. #4 Re: Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Quote Originally Posted by moddman View Post
    Brake switch? or aka BPP switch zeroing with a tech2 scanner? Try it and see if it helps.

    BTW:BPP switch zero calibration is in the BCM. Could be your problem.
    Hm. Noob question, but why would the brake switch cause it to drop into neutral while driving? Thanks for the advice though. I'm taking it to the dealer to get the bcm reprogrammed, would this accomplish this too?
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  5. #5 Re: Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Other question that you might know. In order to write the bcm or pcm software and/or vin file, do you need access to gm's online database, or just the tech 2 and a computer with the software?
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  6. #6 Re: Slipping issue/ rebuild? 
    Donating Users moddman's Avatar
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    Quote Originally Posted by wstefan20 View Post
    Hm. Noob question, but why would the brake switch cause it to drop into neutral while driving? Thanks for the advice though. I'm taking it to the dealer to get the bcm reprogrammed, would this accomplish this too?
    Dealer does the whole thing when programming the BCM. Done deal. Ask if you want to know to see what they did though.













    3.4" ZZP MPS Pull
    ey,ZZP Coupler,NGK PLUGS,L67 Coils,INTENSE 1.8 RR, Custom PCM Tune, ZZP Stage 2 IC, 180* T-Stat, 42LB RE-FLWD Inj.
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  7. #7 Re: Slipping issue/ rebuild? 
    Donating Users moddman's Avatar
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    Quote Originally Posted by wstefan20 View Post
    Other question that you might know. In order to write the bcm or pcm software and/or vin file, do you need access to gm's online database, or just the tech 2 and a computer with the software?
    This: In order to write the bcm or pcm software and/or vin file, you do need access to gm's online database.













    3.4" ZZP MPS Pull
    ey,ZZP Coupler,NGK PLUGS,L67 Coils,INTENSE 1.8 RR, Custom PCM Tune, ZZP Stage 2 IC, 180* T-Stat, 42LB RE-FLWD Inj.
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  8. #8 Re: Slipping issue/ rebuild? 
    Donating Users moddman's Avatar
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    2003 Azteck Transmission Problems Look ---->>>>>2003 Pontiac Aztek Transmission Problems | CarComplaints.com













    3.4" ZZP MPS Pull
    ey,ZZP Coupler,NGK PLUGS,L67 Coils,INTENSE 1.8 RR, Custom PCM Tune, ZZP Stage 2 IC, 180* T-Stat, 42LB RE-FLWD Inj.
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  9. #9 Re: Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Quote Originally Posted by moddman View Post
    This: In order to write the bcm or pcm software and/or vin file, you do need access to gm's online database.
    Sweet! lol I figured so... Not about to pay $150 for two days access and $300+ on the scanner just to use it once when the dealer charges $100. I'll post next week when I have it done!
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  10. #10 Re: Slipping issue/ rebuild? 
    Donating Users moddman's Avatar
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    To de-gunk the transmission as mentioned in complaints:------>>>Try this----->> Sea Foam Trans Tune <<----Its worth a try before spending even a $100.
    Last edited by moddman; 05-08-2018 at 05:20 PM.













    3.4" ZZP MPS Pull
    ey,ZZP Coupler,NGK PLUGS,L67 Coils,INTENSE 1.8 RR, Custom PCM Tune, ZZP Stage 2 IC, 180* T-Stat, 42LB RE-FLWD Inj.
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  11. #11 Re: Slipping issue/ rebuild? 
    Turbo is the way to go. BillBoost37's Avatar
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    I doubt aztek is supported by HPT and it's not by DHP, might be supported by EFI Live thought. That may allow you to write to pcm and vin. Not sure thought.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  12. #12 Re: Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    I doubt aztek is supported by HPT and it's not by DHP, might be supported by EFI Live thought. That may allow you to write to pcm and vin. Not sure thought.
    Yeah. You're right on the money about hptuners not supporting azteks. I hope the pcm is ok, but with the other electrical issues, it's hard to say...
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  13. #13 Re: Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Well, interesting turn of events. I finally had time to test out the tek fully and immediately noticed it took a while for the issue to start, and when it did, the speedometer plummeted to zero. I hooked up my scanner, and no codes. Charted the data when it happened, and sure enough even the pcm was reading zero when the problem occurred. Replaced the speed sensor and nothing happened. Tested the wires and got a high resistance to the pcm. Replaced the wires all the way back from the pcm and voila! Still have LOADS of other issues with the tek, but I was able to drive it 12 miles from my friend's house back to mine! Next, figure out why the radiator fan isn't coming on... but hey, for $400 clean title 173,000 miles, I'm not going to complain one bit! Plus, I just went skydiving for the first time so I'm really happy today!
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  14. #14 Re: Slipping issue/ rebuild? 
    Killa Bee Scottydoggs's Avatar
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    nice work.

    the fans. pull the plug off the temp sensor, both fans should turn on full speed. if they do turn on the temp sensor is bad.

    keep in mind the temp has to reach 212ยบ then the fans come on.

    if they dont come on, relay swapping would be my next step.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  15. #15 Re: Slipping issue/ rebuild? 
    GTX Level Member wstefan20's Avatar
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    Thanks Scotty! I forgot about that trick. Caught me before I started to get too fancy with my test equipment! lol

    We'll see what happens. My wife's happy and I didn't have to rebuild a transmission, so I'm VERY happy! I'll post what happens
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