PCM/ECU Options?
Posted: March 24th, 2022, 6:53 pm
First post on the forum. I've been a lurker here without an account reading up on small things here and there but looks like its finally time to dive in.
So first off, I have a 1983 Jeep CJ7 that I swapped a 4.0 into from a manual trans 94 Cherokee. I even kept the fuel rail on it for MPI. I gutted the factory engine harness down to the bare bones basics (the Cherokee harness has a lot of "fat" on it) and spliced it into the Painless harness on the CJ7 (I redid the entire electrical system on the Jeep previously). After some tinkering I got it to fire up.
So here's the kicker. I intend to turn this thing into a 4.7 stroker. Step one was getting the 4.0 into the CJ to make sure the wiring was good to go and that it would actually run (when parked lol). I did this knowing I would eventually end up pulling it back out anyway. While the 4.0 was on the stand, I did a couple bolt on upgrades to the engine since I am planning on stroking it in the future. 24 lb injectors, after market aluminum fuel rail, bigger throttle body, and Banks Headers (which go to the custom 2.5 in exhaust). The CJ also has an in the tank fuel pump with 3/8 line going to the fuel rail.
Currently I have the stock 94 manual trans Cherokee PCM running the engine. I have zero knowledge when it comes to tuning (I am made of pure big chimp energy. I hit thing with hammer), but I have a buddy who cant help but tune everything to 1000 HP. So you could say I have someone who can handle the tuning side of things.
Now for the actual questions?
Will the stock PCM run the 4.0 in its current modified configuration?
Will the stock PCM run the 4.0 when its stroked to 4.7?
What are my options as far as after market ECUs/PCMs and what would I need to do to the engine/wire harness to use them (again, I have someone who can tune it to hell and back so that wont be a problem.)
So first off, I have a 1983 Jeep CJ7 that I swapped a 4.0 into from a manual trans 94 Cherokee. I even kept the fuel rail on it for MPI. I gutted the factory engine harness down to the bare bones basics (the Cherokee harness has a lot of "fat" on it) and spliced it into the Painless harness on the CJ7 (I redid the entire electrical system on the Jeep previously). After some tinkering I got it to fire up.
So here's the kicker. I intend to turn this thing into a 4.7 stroker. Step one was getting the 4.0 into the CJ to make sure the wiring was good to go and that it would actually run (when parked lol). I did this knowing I would eventually end up pulling it back out anyway. While the 4.0 was on the stand, I did a couple bolt on upgrades to the engine since I am planning on stroking it in the future. 24 lb injectors, after market aluminum fuel rail, bigger throttle body, and Banks Headers (which go to the custom 2.5 in exhaust). The CJ also has an in the tank fuel pump with 3/8 line going to the fuel rail.
Currently I have the stock 94 manual trans Cherokee PCM running the engine. I have zero knowledge when it comes to tuning (I am made of pure big chimp energy. I hit thing with hammer), but I have a buddy who cant help but tune everything to 1000 HP. So you could say I have someone who can handle the tuning side of things.
Now for the actual questions?
Will the stock PCM run the 4.0 in its current modified configuration?
Will the stock PCM run the 4.0 when its stroked to 4.7?
What are my options as far as after market ECUs/PCMs and what would I need to do to the engine/wire harness to use them (again, I have someone who can tune it to hell and back so that wont be a problem.)