7730 ECM's

[x-thumpr-x]

We are currently doing a 3400 swap into a fiero (3rd one) did my first one 6 years ago when it wasn't very common at all in a Fiero, and today I'm still finding new ideas and issues with each swap I've done.

I've normally used a 7730 ECM from a 3.1L j-body, but the last car we found was an 89 Z24 5spd 2.8L. It had the 7730 ECM so didn't think there would be any difference with the ECM's between the years with same part number. Well I started to get into repinning the harness and found wires in locations unfamiliar to me. I went online and got a pin-out for the ECM from the 2.8L and was surprised. I never looked at the top end of the motor, so I didn't realized it doesn't use a digital EGR. It's computer controlled like a stock 3400 motor with pintle positioning.

My question is: are all the 7730 ECM's capable of controling an electronically controlled EGR? Would anybody have the base programming for this ECM if different from a normall 3.1L 7730 application?

This is really interesting to me to see if it can work. The current swap we doing, we've incorperated a digital EGR using the N/A series one 3800 digital EGR plate and spacer. I can't find anymore of these plates at any junkyard around me now. I's rather use the stock 3400 EGR is possible.


I figured GM would have made all the 7730 ECM's the same, the programming would be the difference between applications used for the ECM. I did find a site showing pin-outs for the f-body cars and it used pin locations that were not being used on the j-bodies.

If anyboday and any info or links for the 7730 ECM

[3400beretta]

All 7730 ecms are the same. The differences are in the codemasks. The 3.1 uses the $A1 mask, the 2.8 should be the $6D mask, which has a lot less support.

Now there is an option to select "digital egr" in the $A1 bin, but I'm not sure if this would accomplish what you want.

[robertisaar]

All 7730 ecms are the same. The differences are in the codemasks. The 3.1 uses the $A1 mask, the 2.8 should be the $6D mask, which has a lot less support.

WINNAR!

a 7730 is a 7730. the EVRV EGR stuff went out of favor for a few reasons and the digital setup replaced it. i'm not sure of the 3800 digi uses the same orifice size though... if it doesn't it can be tuned to correct it, but it's a possibly unnecessary step. and yes, selecting the digital EGR flag in A1 will use the EGR correctly if it's wired in correctly.

as for the f-bodies using different pins, that's normal since no F-body ever used the a1 mask from the factory and used a few different inputs to accomplish the same things as the FWD, just in a different method.

[x-thumpr-x]

thanks for the info, does anyone have the $6D mask? I want to try to play with the computer controlled EGR the 2.8L has.

[robertisaar]

thanks for the info, does anyone have the $6D mask? I want to try to play with the computer controlled EGR the 2.8L has.

i have a decent 6D XDF, but there were two 6D masks... most of them work with the one i have, but i believe A1 can control the EVRV as well...

[Guest]

The 2.8 uses a vacuum controled EGR. The wires on the Vavcuum EGR are or pintle position (3 wires), and a purge solenoid (2 wires).

You have to drill a gen3 TB to add the vacuum port for the EGR and/or EVAP canister. I have a drilling jig for this, since the ports need to be just behind the TB plate when closed.