shaking in overdrive

[95dime]

i have to pull the trans to do this since it cant be accessed while in the car? that blows....id rather put a 5speed in its place if it had to come out but itd be tough finding one of those.

[CobraCDR]

Yes, that would be the solenoid. It is sort of internal. It is under the big side cover on the 4T60-E. The cover won't come off with the tranny still in the car due to the size of the junk under it. Also, it felt like it was shifting back down because it was disengaging lockup. Lorenzo (gpse3400) can give you more insight on what to do with this trans, as my only experience with them is blowing them up, and swapping a 5 speed in place of one.

Lorenzo only knows how to build a crazy trans that will chip 2nd and yank the wheel out of your hand under wot

[pocket-rocket]

Yes, that would be the solenoid. It is sort of internal. It is under the big side cover on the 4T60-E. The cover won't come off with the tranny still in the car due to the size of the junk under it. Also, it felt like it was shifting back down because it was disengaging lockup. Lorenzo (gpse3400) can give you more insight on what to do with this trans, as my only experience with them is blowing them up, and swapping a 5 speed in place of one.

[95dime]

pocketrocket, i had tried what you said and when i tapped the brake pedal while on the gas it stopped, but it almost seems like its shifting back down sometimes when i do that? it would stop for a second or two and when i let my foot off the brake it would shake again. so would it be the tcc soleniod then? and also is this external or internal? i have no experience with auto transmissions at all ive only dealt with manuals. also wheres it located? thanks.

[gpse3400]

I would ohm out the injectors... Could also be a failing O2.

[pocket-rocket]

Despite what Sharkey said, when my 91 did it, it was for sure a TCC solenoid in the transmission. Next time it does it, without letting off the gas, tap the brakes so the brake lights come on and see if it stops. If it does, then the TCC solenoid is at fault. Reason being, you leave the load on the engine by keeping on the gas, but when you push on the brakes, the ECM disengages the TCC.

[GutlessSupreme]

i have replaced the sparkplugs, wires, all 3 coil packs, and the ignition module. all is about 2 weeks old or less. other then that the only work ive done is i had replaced the heads on the car, but they were cracked when i bought it from the previous owner, who i know however shes not very bright(is a blonde) and probably wouldnt have noticed any issues considering she didnt know the car was overheating.

sorry, didn't realize you already posted that.

Odd though, all cases of the OD stutter that I remember reading about were due to ignition problems. Acceleration being smooth throws me for a loop as to what else it could be.

Not sure on the unplugged red connector, I'm not familiar with the wiring on the newer cars.

As said, there's a possibility it could be fuel related.. maybe a clogged filter or a dying pump or injector. I'm still leaning away from any sort of lock-up problem, though having the TCC solenoid go bad isn't exactly unheard of.

I'd try fuel filter, if it hasn't been done recently, then maybe checking fuel pressure. Should be able to rent a tester at Autozone, I don't know for sure if they have them though.

[CobraCDR]

heheh I remember that TGP up at the URI garage.....I took the exhaust for my 89 cutlass international I think the downpipe bracket from that car is in my GPSE right now....

[95dime]

Did you replace the just the ICM and reuse the same coil packs?

i have replaced the sparkplugs, wires, all 3 coil packs, and the ignition module. all is about 2 weeks old or less. other then that the only work ive done is i had replaced the heads on the car, but they were cracked when i bought it from the previous owner, who i know however shes not very bright(is a blonde) and probably wouldnt have noticed any issues considering she didnt know the car was overheating.

[GutlessSupreme]

Did you replace the just the ICM and reuse the same coil packs?

[95dime]

replaced the ignition module....still hasent fixed the shaking. what else could be causing it? im not familiar with these motors let alone fuel injection. my real toy i mess with has a gen 1 sbc with a carb.

[gpse3400]

Ok oh so then I don't know you hehe but I know the car! I guess greg has moved on? Yeah at that time I had a red '90. wasnt in the best of shape but some wax would shine it right up

I dont think your link works

[GutlessSupreme]

Yeah I thnk we met a number of times! The first time I took some parts from a wrecked turbo GP that you had in storage! I Needed that hood because my atlernator busted a hole in mine LOL. And then there was that car meet at URI, and then I bought my buddy over and he started to takes some parts from that car!

OH! no that was Greg (no1kicker), I bought my TSTE from him. I was at that URI meet though, back in April '04 I think. But I left early for work, I know a couple of people showed up after I left. But yea, Greg had a parts TGP a couple of years ago, must've been him. I had a TGP for a little while, but I only had the Cutlass back then.

sorry for thread hijack

[gpse3400]

I think its the ignition modual..

[95dime]

alright, i replaced all 3 coilpacks and also put new bosche wires and ngk plugs. its still shaking. what else could it be? i have a plug that i cant find anything it goes to near the alt. its a 2 wire with a red plug. theres anotherone that looks just like one that i have plugged into a square black box behind the icm. could the icm board itself be going?

edit: info on the car- 1995 grand prix 3100 sfi auto. has 2000 malibu3100 heads and roller rockers. other then that its all factory. has 100k on it.