Fuel Injected 351W ECM

[ledzilla]

I managed to get hold of a low mileage fuel injected 351W along with the engine wiring harness. It does not have the ECM, though. Is there a way to determine what the appropriate ECM would be? Does it even matter? Can't get anything from the donor vehicle, it was sent to scrap years ago.

[Mustang Eddie]

I'd imagine an 86-93 HO 302 ECM would work has the proper firing order just your preference for speed density vs mass air flow.

[gadget73]

what are you putting it in? If this came from a truck, is using the truck harness, and is going in a truck, you want a truck ECM. If you're putting it in a Panther, use the Panther harness and a tuned ECM. Trucks are batch fire and the stuff just isn't in the right spot, the car harness will actually fit properly. Can't use a truck harness with a car ECM though, sequential vs batch fire injection so the connector pinout is different.

Doubt any 5.0 ECM is going to feed a 351 exactly right but it would be in the neighborhood at least. Would want to be tuned for more fuel flow to go with the extra air flow.

[ledzilla]

Yeah, this thing came out of an Econoline. Pretty obvious from the oil filler. And thanks for the info. Supposing I ditched the OEM harness completely, would I be able to use a harness from one of the performance aftermarket fuel injection conversion kits?

[Arquemann]

Take a look at the Holley Terminator X Ford MPFI kit, supposedly plug and play.
What intake do you have? Is it the truck intake with the twin throttle bodies or does a van have something else?

[ledzilla]

Well, it doesn't have the plenum (forgot to grab it when hauling off the engine) and it's the twin barrel truck intake. But, I was starting to think I might go with an aftermarket intake and throttle body with 24# injectors (considering a Holley Hi-Ram kit with 95mm side throttle body) along with a mildly aggressive cam with roller lifters. I also took a look at the Holley Terminator X kits, and they look perfect, thanks for suggesting.

[ledzilla]

After further thought, maybe not that Holley Hi-Ram. A 95mm throttle body might be a little excessive for what I'm doing with the motor.

[gadget73]

There are aftermarket options but I'll be honest and tell you I don't know a ton about them. I'm sure someone makes a suitable harness that doesn't cost a fortune. There are some open source EFI systems out there now which cost a lot less and have more options than the big names.

[ledzilla]

Yeah, I've seen the DIY kits, but I'm absolute rubbish with soldering. I'd rather just spend the coin on a full kit with all the pieces ready to go.