A buddies car is acting really fucked and we can't figure out why. Hes in a different province so i'm not there with a multimeter checking it out. Here is the issue: the logs are showing that he gets a violent stutter, at idle and during regular driving. The car goes super lean then stutters like crazy, afrs in the 18s and higher ect as it stumbles. Things ive told him,
If ign was cutting it would probably go rich since it wasnt burning fuel. He has checked the following for me:
85 corolla, Megasquirt vs 1 with ms EDIS
Fuel pressure, it has it, hes tried 2 ,guages all show that he has constant FP not causing it to lean out.
replaced edis unit
replaced vr sensor
rewired harness 2x
tried 3 different MS ecus
checked grounds
Hes put a scope on int, and from what I recall the ecu is getting proper ign pw's with no noise or anything erratic.
Nothing has changed this issue yet, hes currently going to a external dsm ignitor while using the VR as a hall sensor or something.
Only thing I'm thinking of is that the ign drivers are over heating or something and cutting fuel