Just bought a 92 f150 for work. It has a tranny issue, when in drive it pulls very slowly at first but gets up to speed and doesn't sound like its reving very high but definitely has no overdrive. Right off I noticed the ecm has "91 f150" written on it like it came from a scrap yard or something. Could that be causing the issues? I'm going to swap it out with the right one regardlesly. Just wondering what else it could be besides an entire rebuild of course.

Thanks ahead for any advice.

 

Do you know what trans you have? If not count the pan bolts. AOD will have 14, C6 will have 17, E4OD will have 20.
If AOD or C6 then the computer has nothing to do with it and if C6 no overdrive anyway.

 

1992 F-150's use the E4OD auto tranny....

The 1991 ECM, is possibly a replacement.....IIRC, In 1991, the E4OD was introduced to be phased into production, for 1992...

So, if that's the case, I can see this all being plausible...


Question:
Does your gear selector have a Overdrive On/Off button on the end? If not, it's a AOD/c6.....If so, its a E4OD...

 

thanks for the info guys..

It is an e4od

I switched the ecu out with the correct one and it didnt change anything. I can put it in 1st or 2nd and it pulls like it should but in drive it pulls very slowly at fist like it is stuck in 3rd or 2nd, it doesnt shift at all that i can feel but will get up to about 55-60 without sounding like its reving too high. weird part is.. if it is stuck in 3rd it should be trying to kill the motor under the stress but it feels just fine. could it be vacum lines? or something else electronic? any advice would be helpfull.

supposedly had a recent rebuild on the tranny.. but no way to sure, has a pretty good transmission fluid leak as well. when going into reverse and drive it does shift pretty hard, no slipping or anything just lurches the truck a bit you know.

 

Pull the codes and post them.

 

will it give me a readout without a check engine light on?

 

Yes, you just scan it, 600 codes are usually trans codes

 

You most likely have a bad sensor or a wiring problem, those E4OD's are completely computer controlled.

Even a TPS (example) can cause them to go haywire.

 

ok thanks again guys. ill go see if i can get a code tmrw morning.

 

try manually shifting it thru the gears and see if that makes it better. ive changed an E40d in a 93 f150 and the only way the tranny would work rite is if i manually shifted it. i took it to the tranny shop and they reset the computer somehow and it worked great after that. i tried unplugging the battery to reset it and that didnt work.

 

Why not do it yourself a minute, least give it the ole collage try.

Fuel Injection Technical Library » How To Run a Self-Test

Only takes a few minutes, counting flashes is the hardest part by far.

If you can't get it, never come up with the same pattern twice then yea get it done with a reader.

I counted them until I bought a innova 3145, can buy one cheap these days. Its so much easier, I use mine to spot check both my trucks every now and then make sure everything is kosher. I do it when I get home for example, that way the engine already up to full running temp no need burn the fuel takes to get it there just to run the test.

 

ok got no codes at the auto parts store.. tried doing it manualy and i got a ton of codes..

637
654
621
622
629
662

maybe im doing something wrong, i dont know.. none of them show up on the list..

 

Yea those are listed see,

http://www.oldfuelinjection.com/index.php?p=52

I'd take a good look at the MLPS first and also at the harness itself between the trans and PCM.

This truck 4 wheel drive been in the mud/water? Might all be in the MLPS, 92 isn't the updated version yet IIRC? suffer from moisture issues, they get wet inside when off roading get submerged or even if just driven in flooded roads during heavy rain.

Check the harness connector at the solenoid pack, make sure its connection is also free of trans fluid, moisture/water etc. Check the PCM end to just to eliminate it but list of codes really suggest problem is elsewhere instead.

If 4x harness where travels along cross member passing under front drive shaft be suspect, harness can get grabbed by shaft tearing wires in it up/apart.

 

Those are all transmission codes, I would check the plug on the passenger side for corrosion or maybe not even plugged in, before I tried anything else.. Check the Multi function (neutral safety)(drivers side) switch too..


Dang Dan you're fast!!!! LOL

 

Dang Dan you're fast!!!! LOL

LOL I had to look them up a minute, knew they where all trans but don't recall all of them off top of my head.
Wanted to see if common thread among all of them, there is but there ain't, one more would have suggested no power to the pack whatsoever however missing one to call that unless Phillip Reeves just happens to have missed on in the count.

Definitely points to the harness and or its connector being highly suspect right off the bat. Tot might be correct, fluid is "hot" depending on if the truck had just been driven or not before running self test, if it was cold then nope its thrown in then mix as a participating issue/symptom.

Working on the assumption it was a self test result, Phillip didn't actually say. All to often posters leave out that little bit of information helpful when attempting to render aid.