2000 Chevy Express Engine stalls when slowing down, doesn't

ALEXBILTI

MEMBER
2000 CHEVROLET EXPRESS

Transmission problem
2000 Chevy Express V8 Automatic

I have a 2000 Chevy Express van 3500 5.7L engine. I just changed the computer, speed sensor, and both solenoid sensors. Flushed the transmission and changed the oil. Had a technician reset the computer as well. Now, van is slow at take off, and when slowing down, gears don't shift and engine almost stalls. Any ideas? I got codes P1336 and P0740. Car didn't start at first, after I changed the computer (or I should say I put in a new computer, since the original was stolen). After making a few phone calls, was told that the computer needed to be reset in order to "read" the "new" car. After it was reset, the van started. But it was not idling enough and would stall. Another code for the shift solenoids came up and I proceeded to change both shift solenoids (1-2 and 2-3). I then flushed the tranny and changed the oil. Does it sound that I need to program the solenoids? I am still getting both those codes, even now. Also, getting code: Torque Converter Clutch Open.

1 Reply

HMAC300

MECHANIC
48,601 POSTS

This really sounds like the computer has not been recalibrated. You may have to take it to a dealer and explain what happened to your truck and now they will have to redownload it all with the correct calibration. The only way to do this is with a tech 2000 which normally only dealers have. One other thing is that the computer has to "learn" when you drive so it can remember what to do. Make sure your battery is charged though as that effects the cmputer as well.