4 Plug MPFI to Turbo Conversions, Hands up!

Gannon · Post by **Gannon** » Mon Jun 11, 2007 2:45 pm

I have recently converted my Wagon to turbo using the MPFI wiring loom.
Currently i can only get the engine to run with the MPFI ECU, i also have a Turbo ECU that i got with the engine but i cant get it to start.

Who else has done this conversion using the 4 PLug/Hotwire AFM/1987.5-1994 wiring system?

There are no codes, only showing code 3, which means Aust Turbo Auto.

Help please cos i really wanna run the turbo ecu.

Gannon · Post by **Gannon** » Tue Jun 12, 2007 5:44 pm

Im starting to think that im gonna need a new ECU

subanator · Post by **subanator** » Wed Jun 13, 2007 12:22 am

Sorry cant help you with your prob, my was already converted.
Basic checks to wiring and power to dissy, injectors etc would help.
Does it crank?

discopotato03 · Post by **discopotato03** » Wed Jun 13, 2007 12:39 pm

I just had a thought , autos would have had an inhibitor switch so that they can't be started in gear . Did you look into that one because its a common trap with auto computer convers to all kinds of cars . My 87 workshop manual shows this as pin 4 at the ecu , ie (Inhibitor switch AT) and (Neutral switch MT) . Also pin 30 on the diagram shows Identification AT / MT mode .

Trying hard guys , need 4 plug ECU part numbers off the box so everyone including me can tell which is which .

Cheers Adrian .

LTurbo · Post by **LTurbo** » Wed Jun 13, 2007 1:41 pm

I just had a thought , autos would have had an inhibitor switch so that they can't be started in gear

Had to do this with my car when I changed it from auto to manual. I had to make the computer think it is in neutral all the time so i can start the car etc..
But my car (4-speed auto turbo) also has a whole separate computer under the passenger seat just for the auto box.

steptoe · Post by **steptoe** » Wed Jun 13, 2007 2:20 pm

Thomas, if I saw this first, i coulda saved a text msg eh!

I can start a ball rolling

3/87 GLTA efi turbo 3 spd 4WD auto flapper style 3 plug box (ecu) BROBF

22611 AA002 also A11-000 972 serial # ? 5902

Gannon · Post by **Gannon** » Wed Jun 13, 2007 5:47 pm

See it runs with just the EFi computer, but not with the turbo one.

Yes the engine cranks, but wont fire, (havent checked if it is fuel or spark)
I remidied the codes i was getting, knock sensor and WGDS

All it says now is code 3, which means Aust Turbo Auto

I will try the auto inhibitor thing

DP03, is your FSM for 3 plug or 4?

Is it in PDF form or is it on paper. If i could, would i be able to copy a few pages, do you have a scanner? PM me.

Numbers are as follows.... for my Australian Turbo Auto ECU
10
22611 AA280
A11-000 R04 7320

Go to the local subie dealer, they have a parts book with all the ECU numbers in it, i went there looking for the rally version 160HP ecu.

discopotato03 · Post by **discopotato03** » Wed Jun 13, 2007 8:03 pm

Suparoo its a genuine factory workshop manual and it unfortunately only covers the 4 plug hotwire type . I have a couple of images saved from I think here of the schematic and EFI wiring for the 3 plug Australian workshop manual . I'd REALLY like a copy of the flapper EFI section from the genuine Australian Subaru manual .

BTW my manuals EFI section is virtually the same as the American PDF one only it shows our local cars as not having the purge control solenoid valve and the A/T Inhibit Switch/neutral switch section of the interior loom is slightly different .

Also ATM I have been going through the PDF manuals section on single point FI because they used a 3 plug computer , CAS type dizzy (similar to our 4 plug dizzy) and a 4 pin/plug TPS . Suspect that 4 pin TPS may be same as Vortex spider TPS and possibly the throttlebody as well . Manufacturers love to reuse as much as they can in various configurations because its cheaper in the long run . Time will tell .

If BYB is reading this , do you remember selling someone in NSW A spider turbo computer and opened up tagged loom ?

Cheers adrian .

stamp_licker · Post by **stamp_licker** » Wed Jun 13, 2007 8:39 pm

The nuetral switch auto thing is actually in the igniton part of the loom.I've got the 4eat to work in L wired into my loom.Doesn't switch the computer on and off but the ign switch part.Even ej ecu from a auto will run a manual ej and they r a little more advanced than a L.

steptoe · Post by **steptoe** » Wed Jun 13, 2007 11:06 pm

Craigus was a handy person for electrical diagrams, wonder if you can find him??