tonytheplumber
Jr. Member
So the check engine light gets 12v power from the ignition switch in run and start. As stated the ECU provides the ground.
So one of those wires in the painless harness for the check engine light should have power to it during the described times.
You running a VSS in the C4? Is there wiring for that?
Usually the EFI harness has a few wires that can be changed depending on whether you have a manual or Auto tranny. Are they in the correct position for your auto?
The Pro M folks are a good group, as are their products. So if it is calibrated for 24lbs injectors, you should be good there.
Any chance the MAF got dirty from sitting or from an over oiled air cleaner?
Again, as others have stated, not a Fan of the Alphabet cams in a Bronco. You may have to pull the timing cover to get the part numbers off the end of the cam to be sure what you have.
Most definitely need a tune, which will be a piggyback chip. Too many changes for the ECU to compensate for.
EFI Guy is the person you need to chat with... Garry will hook you up.
I suppose I can test each circuit for the CEL independently. I'll see what I can find out there.
There are VSS leads on the painless harness, but they are vacant since my C4 does not accommodate a VSS.
Very slim chance the MAF got dirty, but I'll check that out as well.
A custom piggyback chip or tune seems to be the consensus. I'll hit up EFIGuy after I gather some more mechanical info.