Ive been doing some foot work for a while on a underhood ECM found in quad for PFI 90-93 oldsmobile cars. the part numbe is 1228708

As odd as it sounds its actually a fully loaded 1227730 but its also got the output side of the 1227749. so it can run p/h injectors.

Ive been tracing the schematic from the 1227727 and the 1227730 on this bad boy for a while and tommorow im gonna shove one under the hood of my 4 bange and see if itll actually run. If it does there is now and easy to find underhood p/h capable ECM. i dont know how many of you actually cae but to guys like me who hot rod off brand cars with GM runnign gear this is a humoungus deal.
Anyways just thought id share.

this board has every p4 feature installed on it including exta RAM and all the features that were normally spread out across several ECM versions.

I have checked all the IC numbers and done a circut trace for each i/o line and everything looks thumbs up.

Keep those fingers crossed things just got interesting. good part is it also has the extra ram installed.

 

So, it'll run the $58 code for boost? This could get interesting!

 

in thoery it should pose no problem. the code simply wont make use of the exta i/o much like running $58 in 730 this is akin to running $8d in a 749 but with all the proper i/o setup. ill be giving it a go tommorow. still havent found tiem to unpack and setup the ecm testing gorrila

 

Only downside I see is the few years that it was used. 1228708 was 90-91 with a Quad 4, and the 1228707 (same thing, under dash box) was 89-91. Still, there should be a bunch out there, but not as plentiful as the 730, but most likely more plentiful then the 749.

This looks like a job for learning source code. Combine some of the $8d stuff into $58 code that is needed (or wanted).

I'm anxious to read the results.

 

Would it be able to run 8 p/h injectors?

 

No GM ECM's in stock form will handle 8 TPI P/H's. Cross reference the FET's, I'm sure they are the same as a 730/ or 749. Bob

 

with different FET's and a change of the sense resistors should pose no problem. but as delivered no it wont. but the good part is that if your swapping a GM engine into something different or your putting GM efi on some other brand of engine you dont have to punch a large hole in your firewall to run the wiring

 

ok put the ecm in the car. everything seemed ok but i think the fact that im running an external injector drive was cuasing some injector fet control issues. ill rewire it tommorow and see what happens. first test look very promising. if anybody out there has a vette with a 1227727 please get one of these ECM's test it out and let me know how it goes.

1228708 is the part number

 

OK I have to order a new ecm in the next couple days and this caught my attention. I was going to buy another 730 and then when I run boost later wire it 749 style and use the $60.

Your're saying that this ecm appears to have all of the features of all other ecms of that era and wires up like a 749 will run the $60.

So I buy this 1228708 ecm, re-pin my harness connectors for a 749, plug it in and run the $60 bin??? If so I'll be the first test pig I guess you could say. I'll order it up tomorrow and then ask Grumpy for a copy of the $60 and try it.

I noticed on GMPartsDirect it's the EXACT same cost as a 730 (well $0.01 less!) however it has NO core so I even get to keep my old 730, that's why I'm interested...

 

Funstick mentioned the '8708 as being an underhood ECM. So, it'd be more like a '727, and use different connectors than what your '730 does. IOW, no easy repinning, like the '730 -'749 conversion....

FWIW, junkyard '730s are really easy to find, and shouldn't cost much. So if you've got a pick-n-pull nearby, you can probably save yourself a bunch of money vs. buying a new or reman ECM.

If you want to be a test pig, try a 1228707 instead. That's the "indoor" version, similar to your 730. (FWIW, about a year ago, Grumpy mentioned having once tried an 8707 in place of a 749, and it not working, although he'd only just swapped the ECMs for a quick test. I don't know if he ever investigated that any further, or if the current $60 would fare better than the code he had at the time)

 

Is the 8707 pin-for-pin identical to the 7749? Or, are there pin changes that have to be performed? It would be great if it's as simple as it sounds!!

 

Sounds very interesting, keep us updated.
Does that unit have 8192 baud like the 730?
I'm not familiar with that one.

 

What's the current GM P/N for the 1228707?

 

Found it! I think the current GM P/N is 16198267 and GMPartsDirect lists it for $111.66 (again just $0.01 less than the 730) however it also has a $75 core charge. So unless the 730 and the 707 look 100% identical on the outside connector colors and all, then I won't be ordering one because I have no core

 

If the label was missing or illegible, they'd look 100% identical.

I brought a 707 home once by accident, when I was fishing for 730s. PM me if you'd like to borrow it for testing.

 

Has any progress been made using the 8707?