4T80E/Turbo-S/C... TIME FOR A NEW THREAD? - Page 30 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 11-30-2007, 10:59 PM   #291
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A few vacuum leaks developed and I just put the i/c back on for the last time. Now it will either seal or I'll ditch it. I put a gasket in b/t the plates and siliconed the crap out of every darn surface. I even put a skim coat all the way around the perimeter where the plates come together. It'* very ugly now, so I will NOT be posting any more pics!

I'll let it sit over night before I try to crank it. I'll type the results tomorrow.
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Old 11-30-2007, 11:03 PM   #292
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cant wait dude
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Old 11-30-2007, 11:10 PM   #293
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No, you must take pictures! Please! You're just that much further from cooking rice with your engine bay. Think positively.
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Old 11-30-2007, 11:18 PM   #294
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I finally fixed the rear fuel rail leak. The AN weld fitting got warped a little when I welded it and I've tried everything to seal it. Finally I noticed it was not round at the opening, but slightly egg-shaped. I have a steel tool that is used for top engine cleaning service. It is basically a small steel funnel to fit into different size vacuum hoses. I set the tool in the fitting and smacked the tool a couple times and voila, it set the fitting round again! Now, no more leaks.

I hope tomorrow I can say the same thing about the i/c. If not, I am going to get a 2.75" thick hunk of wood and just machine it as a spacer, no i/c for now. I have to have something under htere, the t.b. won;t clear the exhaust pipe without it.
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Old 11-30-2007, 11:24 PM   #295
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Don't give up Jeff.
We are all watching and projecting positive thoughts.

You are making progress.

Take your time and do it right. Don't rush it.
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Old 12-05-2007, 02:00 PM   #296
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Weel, the engine is great, the trans is not. I now see the prssure manifold has different outputs! I didn;t see it before....

The trans starts out in 4th, shifts to 1st, then 2nd, then 3rd. It doesn't matter what manual position I am in, D, 3, 2, or1, it shifts just the same.

Turboscharged400, please help!

I am thinking if removing the wires from the pressure outputs and seeing what it does. The PCM will probably go to a limp shift mode, but at least the shift solenoids will be sequenced properly (I think...)
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Old 12-05-2007, 05:44 PM   #297
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4T80 prsssure outputs are P,R,N,D4,D3 in two positions and D4, D3 in one output where 4T65 is only D4, D3, and D2 individual outputs.

What if I just run without the TFP switch wires? Will it go into limp home mode and stick in 2nd gear?
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Old 12-05-2007, 05:54 PM   #298
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I would be lead to believe that the PCM is commanding the wrong shift solenoids at the wrong times. Maybe the 4T80 uses different configurations of on/off for the shifts?
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Old 12-05-2007, 06:44 PM   #299
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Sorry to skew the progress of fixing this transmission, but does the car have enough torque to get going in 4th? That would be pretty cool.
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Old 12-05-2007, 07:13 PM   #300
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Help me figure this out: I can;t see the forest for the trees!

4T65:

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4T80:

Name:  4t80Epressures.jpg
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I need to configure the output to look like the trans is in D4.
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