So, the fox-bodiest guy in my area besides me is a buddy of mine. He's actually got a nice collection. Gen 1 and Gen 2 lightnings, a Harley Truck, and a built mod motor coupe in addition to this car.
He's putting together an SSP 1993 CHP coupe I haven't seen, and I was helping him look for an A9L. In fact, I've sent him several links that he missed out on. Anyways, this weekend he told me that he pulled a computer off of a '90 Grand Marquis and installed it. He was pretty happy about it and said it ran fine. I didn't think anything of it, but today it hit me that a G.M. should have the same firing order. I assume that means that the injector phasing is going to be out of whack on cylinders 3,7,5, & 4. I know sometimes computers are run in batch fire without issue. So, that's got me wondering if he's likely to have a lean condition. What other things should he be thinking about?
fire order should be the same, right?
batch fire vs sefi could cause some issues though, depends on setup and what he is willing to accept as 'ran fine'
Wire diagram is a great place to start when swapping ecus.
Meant to say *shouldn't*: non-HO firing order 15426378, I think.
Batch fire, hmm? I guess that would be not ideal. Thanks for the heads up on the the speed density vs. mass air issue, as well. I wonder if he just cranked it without driving it. If SD depends on a MAP sensor he doesn't have, then I would expect the car to run like dog dung.
I'm gonna take a look at the car this weekend. I don't really know what I can do other than check the firing order, which I assume must have been set up in the HO order, and pull the model # off of the computer.
I sent him a link to this thread and he responded that it came out of a GM with mass air. I looked it up and AFAIK the 90 Grand Marquis did not come with Mass Air. Perhaps that motor was a transplant.
If the car's running and driving, I'll report back with my impressions.