I'm looking at Haynes wiring diagram right now, following the orange-purple.

Yesterday I replaced the connector at the right side. To do it, threw the harness over the transmission, disconnected the MLPS and thing holding the harness to the cross member. Got the harness to outside of the driver's door and two connectors are now clean. The wires were stuck together above the solenoid connector for about 7 inches. I carefully separated them and inspected each wire carefully. All looked good.

Today, going to clean the connectors under the master cylinder and to the PCM.

Finally, my question, how do I unplug the PCM big connector to clean it?

 

Write this down (no singing here) g_k50 and greystreak92 both diagnosed with different solutions and both worked.

Cleaned the PCM, ECU or your choice of names connector. 10mm bolt opens it up. Not bad looking except each pin looked a little different and not new. Cleaned it twice. Blew it out good and slowly.

Cleaned the larger of two connectors going in the direction of the transmission below the master cylinder again. My compressor was loaned out last time. One female connector pin did not look like the others so cleaned it four times.

Both got dielectric to each pin male and female. Test drive was better and not slamming between 3-4-4-3 etc. Just would not hold in OD. OD button had no effect again. Then suddenly after about 10 miles everything started working perfectly and still is after about 45 minutes of testing. OD button now works and get engine braking again when off.

Bottom line...corroded connectors...and something stuck in a shift valve.

Please pray that it stays fixed. Thanks everyone.

 

Even differing opinions can yield a positive outcome. Keeping my fingers crossed. (or was it my eyes).

 

It's my eyes that are crossed and rolling. Parked it for an hour after the perfect test drive.
Now won't start. Cranks but will not fire up. Codes KOEO 111 CM 111. Guess it is the bad gas and sitting for weeks. Poured in some Heet.

Good night. May try ether tomorrow night.

 

Now it's time to ...


That right rebuild or replace distributor.

your 622 was due to corroded connections.

Sudden working perfectly was due to PCM relearning.

 

It started normally this morning. Overhead console showed 31 degrees.

Who owns stock in a distributor rebuilding company? Ha! I couldn't resist...

 

Oh what the hell, rebuild it... it'll keep him happy and you can say you exhausted that option.

Any other symptoms? No click, no turn over... neither... both? Pump priming etc?

 

Everything seems to be fine now. Starts and shifts great. I greatly appreciate the help from everyone.

Now for next week's preview of a new thred then...airbag code 51, previously 34. No time this week....

 

I spoke too soon. Once warmed up and at 55mph or above it jumps back and forth between 3 and OD again. I ordered a Ford MLPS today even though Haynes shows the #2 shift solenoid connected directly to the PCM I am guessing the contacts or resistors in the MLPS may be giving erratic readings to the PCM.

Sunday project, just because it needs to be done...test vacuum lines and replace as needed or easily accessible.

When I get the time I will replace the MLPS. Interesting how this was one of the first suggestions...

 

Consider this hypothesis, the OD is slipping so that the computer senses that as overspeeding as if to accelerate so it down shifts the transmission. Now the transmission senses everything OK so shifts to OD. Cycle repeats.

http://www.supermotors.net/registry/media/81709

https://www.ford-trucks.com/forums/2...d-archive.html

 

Groan!!! Hoping is it not a $2,400 plus labor fix. The slamming between 3-4 4-3 happens at light throttle so there is hope still this is an electrical issue and not slipping OD.

Thanks for the links. I'll align the notches in neutral. The new MLPS will probably have a different connector than my 94 so I plan to be very careful doing one pin at a time.

 

FINALLY! Parts man convinced I got the wrong part. New MLPS would not adjust enough to align the Neutral marks. I asked the dealership service writer for Leon, shop foreman, who listened to my story.

Fast forward...

Transmission tech Roger said the the new one in my hand is for 4R70W (or something like that) and will not fit my E4OD.

Back to parts with Roger's statement and Ford parts computer. Said it will fit AODE, E4OD, 4R70. Then he went deeper and found 94 Bronco E4OD and a different part number and it will be here tomorrow. If it works I will post the part number.

----------------------------------------------------------------------------------
What I learned about diagnosing transmission hunting from them.
1. Start first with cleaning battery terminals. They replaced everything on one to no avail then cleaned the battery and fixed it.
2. VSS is a magnet and accumulates particles. Replace it, it is cheep.
3. MLPS replacement. There is an alignment tool but you can set the transmission shift shaft in Neutral and align the marks by eyeballing.

They think this will correct hunting about 70% of the time.

Naturally, I have been going at it backwards.

Waiting for the part.

 

What else could it be? Still getting 3-4 hunting. After a good warm up from a stop shifts gears 1,2,4 tack goes to about 950rpm, jumps to 1900, then back to 950. At 40mph runs fine in 3, let off to light throttle goes to 4 for 2 seconds then back to 3. When it goes to 4 hit if I hit 3/4 throttle it will hold 4 until 75mph. Back at normal driving throttle, it slams back and forth 3-4, 4-3 above 45mph.

KOEO 622, CM 111 now. Engine runs like a new vehicle...best ever.

Replaced

• MLPS
• VSS
• Solenoid pack...twice
• Solenoid connector and opened harness a foot to inspect
• All under hood vacuum hoses
• Stator in distributor.

Cleaned

• MLPS connector many times.
• Two connectors under master cylinder many times.
• Battery starter solenoid connections.

Not done yet...do you think I should try completely removing the transmission wiring harness and jumper the #2 shift solenoid wire? Would it be Purple/Orange?

Or...other expensive thoughts?
Thanks.

 

The good news is I have done all I can do and still get a code 622 KOEO.
I laid the transmission wiring harness on the kitchen counter. Every pin connected. Wife held the meter on the #2 Solenoid wire pins and I did a wiggle test. All passed.

KaChing!!!! to the transmission shop. May not be electrical.

 

I have chased it, replaced everything else, cornered it, solved it and I am now celebrating after fighting it five months. Today, I waited for Santa Claus and he delivered wearing brown.

I was surprised my repaired PCM, (computer) now has a one year warranty sticker on it. After installing it I decided not to be in a big hurry to reattach the fender liner to the fender until after several test drives.

The first test was tonight for almost an hour with varying conditions and it drives like I have a new transmission now.

I am excited!!!
The solution...ecmtogo.com
Ford GM ECU ECM PCM TCU Lexus Toyota Honda Acura repair used Mitsubishi