Okay, 1994 f150 Originally 5.0 AOD, now has 94 351 roller bored .040 over with XE264HR and procomp roller rockers, stock heads, stock internals. Has rebuilt 4x4 E4OD behind it, running stock MAF EFI (no knock sensor, K&N Cold air, No EGR, No Evap Solenoid, Solenoids by coil are plugged in but vacuum disconnected, Has check engine light, Park light, Abs light and Airbag light, Driver rear light has running but no brake light, all others work) Having transmission issues, shop replaced solenoid pack pigtail. Harsh engagement into drive, second gear shift is extremely harsh, third is smooth, at 37/40mph it feels as though the torque converter is rapidly unlocking and locking, the truck bucks very slightly while cruising and a notable tone difference in the engine exhaust can be heard, at around 45mph the truck shifts into OD and feels as though it cannot hold the gear, so it downshifts and upshifts. When the transmission is hot (2hr trip or longer) trans is not overheating to my knowledge but I do not have a gauge, it is not scalding hot to the touch of the pan, full of fluid, it will slip when passing someone, like it downshifts and will hit a neutral before letting out of the throttle and it grabs again. Truck has been to trans shop for warranty work multiple times with no difference, was told all sensors and lights need to be fixed before they can diagnose. The engine is running a computer from a 1994 bronco 302 e4od MAF, am I chasing electrical issues? Computer issues? Transmission not getting signal? Can those aforementioned issues with sensors, egr and solenoids be causing the computer to not know when to shift? Looking for some help to point me in the right direction, not necessarily a solution. Please and thank you all in advance, please lmk if you need any more information or if anything was unclear and Ill try my best to clear things up.

 

Ok. Let’s start at the beginning…. What do the computers say is wrong? Do you have the PCM, ABS and Airbag codes?

 

Did the original 5.0 have the E4OD. If yes, what was the number on the PCM you installed for the 5.8?

 

That was covered in his post. From what I understand the 5.0L computer should run the 5.8

I am questioning that you had an AOD and not a 4R70W. Do you have an OD cancel button on the end of the shifter?




I believe the two transmissions might be wired differently but I’m no expert on that.

 

I have not pulled codes/counted the flashes, I can do that right now. Update it flashed for a solid 3 minutes so im going to upload it as a youtube video and hopefully yall can help me decifer.
Yes the bronco had a e4od, I dont have the calibration number or the PCM number but if it is that necessary I can pull it to see. It was a 94 MAF 302 E4OD, I used the transmission harness from this truck aswell, the transmission did not come from this truck, only PCM and harness.
I may have had the 4R70w, I found the transmission harnesses plug into the same style plug near the PCM, there is a short harness that plugs directly into the main bulkhead connector then it terminates into a connector, I unplugged the 4R70w harness and simply plugged in the E4OD harness, transmission shop was the one that replaced pigtail, so I presume it was done correctly although I do have a spare pigtail. No wiring was done for transfercase light, it is a manual tcase. I have pictures of the old transmission, and the trans code from the door is U

 

Okay I went through and found the codes, looks to be
211 PIP signal
327 Electronic pressure transducer (EPT)/differential pressure feedback exhaust (DPFE) sensor/electronic vacuum regulator (EVR) KNOWN
628 MLUS Failure
565 Canister purge solenoid (CANP KNOWN
653 Transmission control switch not activated during self test
I do have O/D off on column shifter.
ALSO EDIT, I read that the MLP/TR can cause 628, the transmission, before being rebuilt, was under 4 ft of water for a solid 2 months, and when rebuilt it kept the same sensor(I think), I assume I should replace this as water intrusion is an issue as a first step? TQ definitely slips though, and its been 2 years since it was in any kind of water.
Video of flashes.

 

[QUOTE=My4Fordtrucks; From what I understand the 5.0L computer should run the 5.8

You might want to check that out. I show they are not necessarily compatible for the same PCM. Also shows it may work but with issues.???

 

I did alot of research on this topic before doing the swap, on the terms of engine EFI it will run fine on a 302 computer with MAF, engine runs great, transmission issues is what the main issue here is. Computer adapts to the information received from O2 sensor, it has a new sensor in a good spot. MAF sensor has been swapped out and is in functioning order, only issue associated is the 351 doesn't have the knock sensor boss, but with it being unplugged the computer just doesn't pull timing. Unless the shift points are drastically different between a 302 and 351. Lots of people seem to have no issues doing the same swap, with the same or similar cam, aswell. I do plan on purchasing a PimpXshift in the future, but thats not feasible now, just started college.

 

Trans Code U denotes a 4R70W transmission. That implies the truck was already MAF. Why did you do a transmission swap as well as engine?

 

302 was shot, I wanted 4x4, more power, stronger transmission. If I was going to build something it was going to be a roller 351... I also made my living off of parting out trucks so it was easy to find everything I wanted and sell of the rest. Highschool project done 3 times over + truck was MAF and I wanted to do a 351 with MAF and the truck having all the harness already made it almost plug and play. In the plans is AFR 185 heads and dana 60 swap with about 11 inch lift over ride height with 37s. Has 31.10.50r15 right now until all the issues are sorted. Super clean truck and wanted to build it into my dream truck.

 

I suppose that makes sense since you have access to parts. My code manual states Code 628 indicates a Converter clutch Lock-Up error. Not sure if a bad MLPS can trigger that code. Since you know it was under water before I would replace it or very least. test it.

As far as the ABS light on I would suggest to pull the RABS codes to see what is causing that.

 

I have a friend sending me the MLPS from the e4od from the ecu/harness bronco and the original 4r70w to test before buying a new sensor, ill search for a method to test them. I dont know how to pull RABS codes.

 

MLPS Testing

 

RABS Codes courtesy of Steve83

 

I checked for RABS codes and found that my float was stuck at the bottom of the reservoir, fixed the float and my park brake light went away, but ABS did not. Grounded the circuit after fixing the float and nothing was flashed. It was raining but I tried multiple times to ground it, before giving up, I don't think it was a ground issue but Ill try again soon.