91 idi e40d

[WallyS]

Pulled a code 26 (also code 23, 67). Something doesn't feel right about the way this truck is shifting (and has a small leak from what might be pump seal) so I started poking around. Feels like it's revving too high to get moving, and it shifts into 3rd too soon. Shifts a bit mushy. Fluid levels are good (needs a top up every couple weeks).

I have been reading about these transmissions overheating and puking atf from some kind of bypass? Would a faulty TOT sensor make the transmission think it was overheating and start leaking? Forgive my ignorance, still have not picked up a service manual.

It may be wishful thinking on my part that this tranny doesn't have to come out but the guy I bought it off said he had already replaced the pump seal and was surprised to hear it was leaking (big surprise eh).

Just pulled the inspection cover, looks like a regular old leak to me, behind the flywheel facing the trans...

 

[trackspeeder]

A bad converter hub or bad pump bushing will make a new seal leak. Your leak is a failed pump seal.

Code 26 is a failed TOT sensor. This will throw off the shift schedule.

A failed TOT requires replacement of the solenoid pack. Tranny needs to be pulled for inspection and replacement of the pump seal.

 

[WallyS]

A bad converter hub or bad pump bushing will make a new seal leak. Your leak is a failed pump seal.

Code 26 is a failed TOT sensor. This will throw off the shift schedule.

A failed TOT requires replacement of the solenoid pack. Tranny needs to be pulled for inspection and replacement of the pump seal.

Sounds like this trans is going to the scrap pile once I find a 5 speed. 450k on it, not worth it. Thank-you trackspeeder for your reply.

 

[Prototypemech]

If you try to read the codes while the transmission is cold, It'll throw a TOT sensor failure. The transmission needs to be warm before you read the codes. There is no valve that jettisons transmission fluid if it gets too hot. Its probably the input seal. As for the strange shifting, have you checked the throttle position sensor to make sure its set correctly? That will cause it to shift strange.

 

[WallyS]

If you try to read the codes while the transmission is cold, It'll throw a TOT sensor failure. The transmission needs to be warm before you read the codes. There is no valve that jettisons transmission fluid if it gets too hot. Its probably the input seal. As for the strange shifting, have you checked the throttle position sensor to make sure its set correctly? That will cause it to shift strange.

Ahh ok, I will try again after I get home. I will check the TPS adjustment, I hope it's easier to set than my 1989 GMC Tracker what a pita. It's pretty funny working on this truck, I have scaffolding setup outside my shop just to check the oil lol.

 

[OLDBULL8]

The TPS voltage is set between .96 VDC and 1.02 VDC with the engine warm. The higher the voltage setting, the firmer the shift. The trans. fluid level should always be checked when it is HOT, and vehicle level. Better to run a E4OD a little low, than right up to the full mark, anyplace on the hash mark when HOT is good. When retrieving codes, the throttle has to be held at WOT or else false codes will show up. Rarely does the TOT go bad, trans has to be warmed up before code reading, around 100*F is good.