Im getting these pesky open circuit faults occasionally, and I can't seem to figure out the problem.
They occur usually on cyl 1,3,4,6 and are always sporadic. Mostly on startups and revving in neutral. I am able to hit full boost and drive with no issues, misfires, or codes.
I have the ECS coil conversion harness with ICM deletes. Plugs and harness were all new 3000-3500 miles ago.
Tried moving conversion harness ground from back of IM to cam cover, no change.
Tried swapping coil packs, no change.
Just installed both new primary o2s because I had an occasional code for one of them, no change, although car seems to idle and rev up better. But open circuit codes still come back.
I read through this thread but the symptoms just don't seem to be the same:
I figured I would see if anyone had any input before I start diving into the ECU harness.