Automatic Transmission - TCC lock up problem




View Full Version : TCC lock up problem


Jims-ZR2
07-09-2006, 01:33 PM
This doesn't exactly relate to F-bodies etc. But in my 96 S10 every now and then the converter won't lock up. It's a very weird problem, and I can't find a fix for it. Doesn't set off any codes.

When you first start it up and drive it, it'll lock up within a few minutes as expected. Once in a while it'll just unlock and won't go back in. Sometimes if i pull over let the truck idle for a minute or so it'll work again. Today it wouldn't. This only use to happen in the winter when it was really cold out, (we thought my aux. cooler i put on wasn't allowing the fluid to reach operating temp) but now it's occuring now in the heat. I have a tranny temp guage which is working as it should, I've hooked the tech 2 up to it before and the tranny and engine are both reaching operating temp. I've replaced the brake controler switch, TC solenoid, and 3 weeks ago I took the valve body out brought it to the tranny shop, they thought my valve was worn, even with 170,000 miles they said it showed really no wear. So they put a heavier spring on the valve to make lockup 100% instantly. This is really starting to piss me off, especially when it happenes when I'm going for a long drive, it kills my gas mileage. The only thing I could think of is the tranny temp sensor.

It acts like it's electrical related, being that it won't do it for 2 weeks then today it won't lock up at all. Also Before I took the valve body off, I checked the converters slip speed at lock up, and it was 0- -6 which is where it should be, so it almost makes me believe it's nothing in the converter. I need help guys, this is really annoying


Predator T/A
07-10-2006, 03:29 PM
could be a bad tcc solenoid nevermind i see where you replaced it temp sensor could be the problem if its not reading that the tranny is at operating temp it will not go into lockup

Predator T/A
07-10-2006, 04:05 PM
there could also be a problem in the pcm


Jims-ZR2
07-10-2006, 10:02 PM
i got a reprogrammed pcm from pcmforless.com, just to help with my bolt on's. Never thought about it before, but after I put it in i noticed it still did it

Predator T/A
07-11-2006, 11:50 AM
you need to put it on a scan tool and see what commands are being recognized by the pcm