2006 Cobalt LT - Transmission Issue? NO CODES
My 2006 cobalt LT has roughly 167,000 miles on it. A few weeks back I was leaving work and experienced a loss in power when accelerating from stop in 1/2 gears. The RPM's did not jump nor did it sound like there was any slipping, but rather it sounded like the motor was bogging down. After a very short distance I parked the car to avoid causing any damage.
Put the car on the lift, checked fluid level and everything was in good condition. Clean red fluid, no burnt smell. Checked codes and for stored codes, but found nothing. After reading a few forums, i grounded the TCM as one guy did, and the vehicle seemed to run better. A couple days later, same symptoms; loss of power and sounded almost exactly like when someone is riding the release of the clutch on a manual. Stopped the car, put in park, then back to drive and it was ok. Still no codes.
Trying to avoid dropping the tranny, i removed the pan to check for any metal shavings, but found the fluid to be in excellent condition. Changed the fluid and filter anyways. Cleaned off the TCM connector, cleaned throttle body, checked all wiring, and found one ground that was corroded pretty bad and replaced that ground.
Replaced MAF and car seemed to work good for a day or two, and now it has the same sporadic loss of power issue, but now it has issues going from 3rd to 4th. No slipping, but just wont shift. I can let off the throttle or shift to neutral and back to drive and it works fine again.
I cannot seem to figure out what the issue is. Thoughts??