93 tranny in 96 problems

Eli

New member
I have looked for this elsewhere and have not come up with anything yet. I installed a 93 tranny into my 96, and it works great with one problem: Once the car reaches 85mph, it acts as if it has hit the speed limiter (which has been removed via chip). When the tranny was first installed, it had the original speedo gear, and we switched it to the 23 tooth last night (car has 4.10 gears). The problem remains with the vehicles actual speed and not indicated speed. After it has this problem, the OD light will flash until the car is shut off and restarted, and after that the light will not return until the problem is repeated. The 93 tranny worked great until it was installed in this car.
 

Frankie X

New member
If the O/D light flashes, the PCM has put the transmission into FMEM (failure management effects mode) and will set codes to indicate why it made that decision.

Scan the car.

....or guess...
 

Eli

New member
Well, when it is restarted the light no longer blinks...Is the code still stored? I figured it would do something like that, but I wasn't sure if it would reset after I shut the car off.
 

Frankie X

New member
Yes, most malfunction codes in EECIV or OBDII systems will be stored for ~60 "warmup cycles"-- one cycle: from the PCM seeing ECT and IAT signals being equal (coolant temperature is the same as ambient air temp) up to full operating temperature, and back down to equality again. (There are certain exceptions to this rule, but never mind...)

If the PCM didn't have memory, I'd be beat for most of my intermittant problem diagnosis. What would I tell my customers? "The light's not on, get lost and don't come back until it is!"
 
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