harsh shifting 1/2+2/3 on 95' 4x4 Explorer | Ford Explorer Forums - Serious Explorations

  • Register Today It's free!

harsh shifting 1/2+2/3 on 95' 4x4 Explorer

bikernzrh

New Member
Joined
July 17, 2007
Messages
4
Reaction score
0
hello everybody

just discovered this great forum and hope to find someone who has got an idea what might be wrong with my transmission (probably a 4r55e?). Symptoms, observations and checks so far:

- harsh shifting from 1/2 and 2/1 and even more so 2/3 but NOT 3/2. 4th gear seems totally unaffected. the feeling is a bit like in a manual, brutally banging in the gears without disengaging the clutch.
- car feels like engine "stalls" for a split second (which in reality it does not, engine runs fine) and then keeps going which causes rearend to rock back and forth thereby causing the springs to make a clunking noise
- problem seems to occur more on slow roll ons and is a lot less dominant under heavy acceleration.
- sometimes problem does not show up for 1 hour or half a day
- shifts seem positive, don't notice slippage
- taken it to a tranny shop in vancouver area but they didn't seem to find a reason for the behavior and suggested a compleate transmission rebuild which i cannot afford. told that guy i suspected electric/electronic problems but he just shrugged and said that if that was the case the computer would throw a code. he did a transmission flush/filter change and also checked the differential. problem persisted despite 450$ spent.
- had a ford dealer read the codes. one error of a faulty EGR valve. had it disconnected without causing any new problems but also without improvement.
- fiddled with the connectors of the fuel injection and to the computer hoping to clean bad contacts. don't know if it is safe to say this but -sometimes- this seemed to cure the problem for an hour up to a few and sometimes nothing improved.

reading in the forum i wonder if the epc solenoid might be the source of my problem. any other suggestions?

thanks a lot!
 



Join the Elite Explorers for $20 each year or try it out for $5 a month.

Elite Explorer members see no advertisements, no banner ads, no double underlined links,.
Add an avatar, upload photo attachments, and more!
.





Welcome to this forum! It's a good idea to add your vehicle, and location to your user profile. So no codes came up. Did you clean the main transmission harness connector? Intermittent problems are sometimes hard to find. Transmission shops always try to push for an entire rebuild. How many miles do you have? You might want to rebuild the valve body or at the very least check the valve body gaskets, and bolts.
 






Is this perhaps because the converter is locking up and not unlocking during upshift/downshift?

Don't know just throwing that out there.

Cheers.
 






thanks for your thoughts guys!

@brooklynbay: checking that connector sounds like a good idea. don't have access to a lift but i'm sure i will find some way get to that connector. the car has 215000 on the odometer. checking vb would be next step. but for that i'd have to take it to a transmission shop and i wonder whether it would make sense to rebuild the vb anyway, once the pan is down. btw. transmission fluid seems clear and ok.

@sumless: by monitoring engine speed i doubt the torque converter is locking up when it shouldn't. is it mechanically possible that the TC locks up in 2/3 at all?
 






i agree with sumless... my truck is doing that now and its been acting up like that for a little over year now and it finally threw the code the other day for the torque converter and got really really bad.. id keep that in mind but if thats the case ur better off rebuilding or replacing it anyway u might want to think about saving up or getting rid of it =( before you get into any serious problems and wind up getting stranded
 






thanks guys for all your ideas. have checked the transmission connector - no improvement. eventually had the epc-solenoid replaced at a transmission shop which seems to have fixed it. according to the shop owner, a faulty epc solenoid defaults to high line pressure, therefore causing harsh shifts under light load. under heavy load, high line pressure is essential which was why it would shift normally then.

haven't driven the car far since. would post update here in case the fix wasn't permanent.
 






One year later I can safely say, changing the EPC solenoid did the job. Thanks guys for your thoughts.
 












Back
Top