2.9 EGR REmoval

[rusty ol ranger]

Whats the part number on the ECM?

 

[Kellogg]

Whats the part number on the ECM?

E8TF-12A650-U1A, that's for the one from my coworker. Here's a picture of the label. It came up as an 88 when I googled it.

 

[rusty ol ranger]

E8 is an 88 ECM.

Fords first 2 digits in part numbers is the year that part was designed. The first letter designates decaded (C-60s, D70s, E80s, so on) and the second number is the year within that decade.

So E8 would be...1988.

Why dont you start a new thread here in the 2.9 forum. and itll draw more attention. That way you can get all the smart dudes out to help.

 

[Paulos]

Rock Auto shows that the ECM is an '88 4x4, auto trans, with federal emissions (E8TF-UA). I don't know if the 4x4 will cause any issues in a 2wd. The EGR position sensor (EVP), the EGR solenoid, and the knock sensor should be disconnected when using the '88 or later ECM. It's possible that leaving those sensors/solenoid connected may not be an issue (if their respective pins aren't used on the '88 ECM), but I would disconnect them just to be sure. You should be getting a code 95, because the load side of the fuel pump circuit on an '86 does not go back to pin 8 on the ECM like '88 and later ECM's do. You can also disconnect the vacuum reservoir from the vacuum tree on the intake as it's also part of the EGR system.

 

[Kellogg]

I played around with the truck some more today and swapped my old ecm back in and the truck ran pretty good, idle was still a little floaty but power seemed there. then I plugged the 88 ecm back in drove around and it ran just as bad as the first time, idle would drift up by about 200 -300 rpm when shifting from drive to neutral or into park and then slowly come back down to around 850-900, and when I would crack the throttle it would hesitate real bad. But this time I was able to pull codes 95 and 86. code 95 had me checking grounds and checking fuel pressure and scouring everywhere for answers, so thank you Paulos for the info. I cleared the codes and did an KOER test and both codes came back, book says code 86 is adaptive fuel limit reached or 3-4 shift solenoid circuit failure. I will post an updated version of this to the 2.9 page.

 

[rusty ol ranger]

Im wondering if that ECM is any good.

You crack the case and peek inside?

 

[Paulos]

If you get a good working ECM, the code 95 is fairly simple to fix. You'll need to get an ECM connector pin (with wire attached) from a junk vehicle, pop it into your ECM connector at the pin 8 position, and connect the wire to the line/input side of the inertia switch.

 

[Kellogg]

I didn't open it up but my co-worker said he did before giving it to me, said all the circuits/boards were foam sealed up, couldn't see much. But who knows. Advanced Auto sells refurbished ecms for and 89 auto, but they didn't carry one specifically for a 88, only had a CA emissions 88... Wondering if it's worth trying the 89.

Also probably worth noting, I pulled the iac valve plug and the RPMs dropped down to the 550-600 range with both ecms, not sure if that qualifies as me having a potential air leak. Upper and lower intake was removed and cleaned last year along with new vacuum lines so I hope not.

Thanks for the fix Paulos, i was thinking of making a pin but your idea sounds easier. Do the 88+ ecms need that connection to operate correctly?

 

[rusty ol ranger]

An 89 ECM is the same as a 88 to my understanding.

Foam sealed up? I think hes feeding you a line o' shit lol. If you undo the screws the cover comes right off and you can see all the motherboard circuitry and stuff.