TCC Bypass? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-24-2008, 01:28 AM   #1
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Default TCC Bypass?

Hello. Still having problems going up hills on my 97sse. As posted earlier I have changed plugs,wires,new ac coils and just this week a new tps...no luck. I currently pull the trans into 3 or tap the brakes to unlock the converter and it gets me over hills just fine.

Was going to try a new map but thats $300!!!
What I would like to do is wire a tcc unlock overide that would copy the tapping the brake technique, as tapping the brakes only sometimes momentarily unlocks the TCC. Theres alot of wires on that brake switch!

Can anyone help me out with wich wire I would ground/ apply power to/ remove power from? or am I getting in over my head? If I had a wiring schematic I think I could figure it out with some help.

This car runs awesome other than this annoying problem and I average 26 mpg with no codes. 160k miles

i love this car but cant throw more money at it....The local AAmco wants to rebuild the tranny but it works fine other than the getting over hills problem...I'm still not sure If I have a tranny problem or the engine just isnt performing as it should and the downshift or tapping the brakes is just giving me the torque increase to smooth things out. Sometimes it surges when all this is going on and sometimes it just feels like it just runs out of oomph. The fuel pump was also recently replaced, also the uim and gaskets.

Any recomendations and or help with the wiring bypas is much appreciated.

Cary

Last edited by booc; 12-24-2008 at 01:46 AM.
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Old 12-27-2008, 07:35 PM   #2
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This is classic ignition problem--the lack of ignition strength keeps the power down and causes the bucking with the TCC locked and the engine under load (like up a hill). One of these three things is the likely culprit--1 the computer, 2. the coil packs, 3. the ignition module (well, plugs and wires too). Ignition modules can test good and be bad, as can the coil packs. Autozone parts of any kind (ignition module, coil packs, computer) are likely to be bad out of the box--avoid them. Best if you have somebody in your area you can swap known good parts with (give them back when you're done...) before just buying new parts and throwing them at the car. I've had all 3 things go bad (not at once) and NOT throw codes. Weak doesn't mean failed, so no code, but runs bad. Go with AC Delco parts. They cost more, but they work. No-name Chinese-made parts often don't work when brand new.
Keith

Last edited by KeithH; 12-27-2008 at 07:38 PM.
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Old 12-27-2008, 09:20 PM   #3
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Thanks for the reply Keith,

The coil packs were brand new in the box AC Delco
Wires are Belden
Plugs AC Delco

?? Where are the ignition modules for the 97 sse

I will give that a go

Last edited by booc; 12-27-2008 at 09:21 PM.
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