hey, i have a vehicle with a 3/4 350 that i am trying to go multiport on. I have heard from edelbrock that they use the stock ecm and just splice the injector wires so i can run 6 injectors. Would this work, or should i figure a way to swap to another ecm? Thanx
Joel

 

Yes, it works. My preference would to to use an ECM that is designed for port injection.

RBob.

 

Such as what? Ive heard of the 7730 ecm, but i am completely lost on how i would repin that from my 8062 ecm. Any other help would be greatly appreciated. Joel

 

The '730 with the $8D mask is a decent choice. Over on diy-efi.org, gmecm, there are wiring diagrams of the '90-'92 TPI ('730 $8D) system along with the '747 system. The '747 should be very close to the '8062 wiring. May even be the '89-'92 TBI f-body diagrams there ('8746 ECM).

Just need to look at what pin does what and swap them around. Re-pinning really is easy. Just need to put together a pin-to-pin swap chart together first.

Read up on how to program the '730/$8D and go from there. Don't forget some data logging harware.

RBob.

 

As far as i know, the 7747 and 8062 ecm are very close. I had my truck running on a 7747 for a few days until i realized my AC wouldnt work with the 7747, but it did work with the 8062. Any ideas. Thanx so much for the help.
Joel

 

As far as the A/c not working you mean the compressor wouldn't kick on? If so my Jimmy won't run on a 747 because of that. The 747 lacks the control programming to turn the A/c compressor on and off.

 

ya, but does that mean i cant swap to a 7730 ecm?

 

The '7730 with the $8D code supports a bunch of stuff. The A/C conpressor being one of them. It also has control for two engine cooling fans, CCP, EGR, digital dash, shift light, TCC, oil temperature monitor, . . . Don't HAVE to use all of this, but it is there if you want to.

RBob.

 

So you can swap in a 7730 ecm, which will log faster than the slow baud TBI ecms.... just by re-pinning?

 

Only if swapping to a multi-port system at the same time.

RBob.

 

Gotcha!