Does anyone know if an ecm from a 94 or 95 fullsize pickup with a tbi v8 will work with the wiring harness from a 94 sonoma that had a v6tbi and 4l60e trans?

 

It should but I don't know for sure. Go to a mechanic with electronic circuit software and have em look up the pin-outs on both ecms. They should be identical with only a memcal difference.

 

thanks jprevost,

i was asking because i wanted to use a ecm from a fullsize to mate with a goodwrench replacement engine or a vortec, but i did'nt know if the ecm(actually pcm) would work with an increase in horspower like these engines. i've been reading that the pcm can adapt but this is limited. the pcm that ihave now is only working with 165 horsepower and has to control the trans. i beleive the earlier ecm's only controled engine only and not trans. so this would definitly keep me be limited to what year pcm i could use. whatever the case i'll try the pin out or see if there is a wiring diagram out there somewhere,
later

 

Those ecm's are still speed density so any increase in horsepower will cause issues with WOT and just about every other condition other than "steady throttle cruising speed" which is obviously closed loop. Even stock calibration isn't very good with a stock system let alone one that's more VE from 1000rpm to redline . You can recalibrate those ecm's with Tunercat software and a pocket programmer. I'm about ready to head home to NJ where I'll be tuning my Dad's 95 suburban. It's getting an Lt1 cam for x-mas so while I'm at it I figured I'd remap the fuel and timing. If anything use the software to calibrate the tranny shifts and get rid of the stupid low rev limiter. My dad's calibration has a 4800rpm limit and fuel doesn't come back until 4200!!!! That's just wrong. It does explain why our old 87 burban with TBI was so much faster with the goodwrench replacement motor. Oh yeah, and when you tune it you don't have as many software limitations. You could control a very hot cam with it so long as the rest of your system (injectors, etc) is up to par. Talk about coolness factor!
You might not need to change the ecm, just burn the new calibration like the BJYA bin file (found at www.diy-efi.org ).