I have a 1990 f250 460 with a e4od. Ever since i bought the thing, ive always had a hard/delayed 2nd to 3rd shift. I thought it might of been the mlps because the truck threw a code for that. Turned out it wasnt. Fluid is still clean. Any ideas on what it could be?

 

the MLPS doesn't control shifting. there is a solenoid pack on the other side of the trans that does that. They are not too hard to replace, just pricy. I have been told to only get one from the dealer if replacing.

https://www.ford-trucks.com/forums/1...l#post15938115

 

What was the code, by number, and during which test was it displayed?

 

The code that it threw was 67 for the koeo. Havent done the koer yet

 

Would a faulty solenoid pack throw a code for either a koeo or koer?

 

Code 67 is Neutral Safety Circuit failure. Could have been caused by a mis-adjusted MLPS.

Most transmission related codes are triggered during the KOEO tests. Some are KOEO and CM.

 

Yes i know, i replaced the mlps. Im now trying to figure out the harsh shift. What you mean by CM?

 

Do you know if the transmission has been replaced? Generally if it were an electronic issue (say limp mode), it would shift hard in all gears, not just the 2-3.

The early E4OD (especially the first model years, like your 1990) had a lot of design flaws and issues. If someone rebuilt it at some point (which is very likely for an early E4OD), they may have put in some kind of shift-kit to firm up the shifts.

 

Ya, when i bought the truck he said the previous owner before him had it rebuilt. No documentation to prove that. I was sorta thinking it might have a shift kit but it wouldnt explain the one harsh shift.

 

CM= Continuous Memory aka stored codes.

 

It could if the shift-kit/rebuild was done incorrectly, or it was a one of those "selectable" shift kits where you can drill different holes to different sizes for a different firmness in each gear.

Is the MLPS code gone now?

 

Oh i see. Yes the mlps code is now gone. Might see changing the selonoid pack helps

 

Anybody else have ideas?

 

Changing the solenoid pack won't really change anything. The shift-firmness is controlled by the valving inside the transmission, and the pressure control solenoid. If the EPC solenoid were faulty, all shifts would be harsh.

If you have no codes, your speedometer works fine, I'd suspect internal modifications were done to the transmission. I suppose it could be a faulty TPS, but I'd imagine that would once again affect all gears, not just the -23.

 

I guess cracking the pan open to see if i have a shift kit is my first order of business. Could a stuck valve in the valve body cause a rough shift?