So, my quarantine project has been swapping out my tired 195k motor for a refreshed longblock (all the accesories from my old motor with a fresh block, so all accessories were working prior to this swap) in my Spec E30 build. I am in the home stretch and was hoping to have it fired up and do my ring-seating break in drive, but alas I am unable to get it to fire. I believe I have narrowed down my current issue (cause I am sure I will have another once I solve this), but I am hoping to see if others have dug into this before I proceed....I will bold some of my highlight thoughts...
Here is where I am:
The new motor cranks and really wants to catch, but doesn't.
I have spark at all 6 plugs.
I have verified my fuel send and return lines are correct.
Only fuel injectors 2, 4, and 6 are firing. Injectors 1, 3, and 5 are not firing. Verified this during attempted starting as well as pinning out the harness (36 and 2 jumper, pin 17 to ground for 2, 4, and 6 and pin 16 for 1, 3, and 5 per the Bentley). Fuel injector rail is the later style.
Looking further into 1, 3, and 5 not firing I have dug into my C191 connector (which looks surprisingly clean, none of the typical corrosion or heavy oxidation)....
I have verified that I have continuity at the female/body side of the connector between Pin 16 of the harness and pin 6 on the C191
I exposed a millimeter of wire on the male/fuel harness side PAST the C191 and verified I still have continuity between Pin 16 and the harness....This is the one that surprised me, indicates the connection is solid inside the C191. But still no firing of Bank 1, 3, 5 injectors when pinning out the harness
The fact that none of those three injectors are firing leads me to think that there is a break somewhere between the male side of the C191 and the injectors. Has anybody fully dissected one of these harnesses to understand if there is another junction in there? I really want to do the least amount of hacking as possible when I pull this out in a bit...
Some of my other assumptions in this:
The hot lead is shared between all 6 injectors so if the other bank is firing that must be fine.
The injectors are all wired in parallel, so one being unseated or having poor contact would only disable that single injector
Open to any other thoughts or help!
Here is where I am:
The new motor cranks and really wants to catch, but doesn't.
I have spark at all 6 plugs.
I have verified my fuel send and return lines are correct.
Only fuel injectors 2, 4, and 6 are firing. Injectors 1, 3, and 5 are not firing. Verified this during attempted starting as well as pinning out the harness (36 and 2 jumper, pin 17 to ground for 2, 4, and 6 and pin 16 for 1, 3, and 5 per the Bentley). Fuel injector rail is the later style.
Looking further into 1, 3, and 5 not firing I have dug into my C191 connector (which looks surprisingly clean, none of the typical corrosion or heavy oxidation)....
I have verified that I have continuity at the female/body side of the connector between Pin 16 of the harness and pin 6 on the C191
I exposed a millimeter of wire on the male/fuel harness side PAST the C191 and verified I still have continuity between Pin 16 and the harness....This is the one that surprised me, indicates the connection is solid inside the C191. But still no firing of Bank 1, 3, 5 injectors when pinning out the harness
The fact that none of those three injectors are firing leads me to think that there is a break somewhere between the male side of the C191 and the injectors. Has anybody fully dissected one of these harnesses to understand if there is another junction in there? I really want to do the least amount of hacking as possible when I pull this out in a bit...
Some of my other assumptions in this:
The hot lead is shared between all 6 injectors so if the other bank is firing that must be fine.
The injectors are all wired in parallel, so one being unseated or having poor contact would only disable that single injector
Open to any other thoughts or help!
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