I have 95 hummer h1 and it won't shift 1 to 2
1-2 shift does not happen at WOT (Wide Open Throttle) until you let off the gas:Best case: try replacing the TPS. Middle case: leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). Double check by using the pressure gauge and watch for a big drop when the PCM commands 2nd gear. Worst case: poor line pressure rise (see below).
1-2 Shift shudder at WOT (Wide Open Throttle); delayed or abnormal 1-2 shift; There's a problem ONLY on the 1-2 shift: 1-2 accumulator piston cracked or stuck cocked in the bore. Check the yellow spring inside the accum housing for breakage. Also, if the accumulator housing walls are scored, the housing must be replaced.
1-2 shift is delayed and harsh, may not shift into OD: TPS needs to be checked for smooth and linear electrical response over the entire range of motion. If not, this must be replaced.
1-2 or 2-3 shift is slow/soft above part throttle:Transmission is on its way out. Transmission must be removed and rebuilt.
Hope this helps
Jan 30, 2016 |
Hummer Cars & Trucks