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81cutlass

Royal Smart Person
Feb 16, 2009
1,741
2,710
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Western MN
I don't see a ignition module ground? Pin D is ref low ground but it goes to the ECM, not to the block.
1559827741631-png.115230

1559827798316-png.115231
 
fleming442

fleming442

Geezer
Dec 26, 2013
6,159
7,054
113
I see; it's a little different than the Series 2 I was dealing with. In the interest of basic troubleshooting, check: resistance between a known good ground and the ECM input (7th pin from right-can't read the #), pin B3 on the ECM, pins G & L on the ICM. To me, any variations on the latter 3 would point to a bad driver in the ECM or faulty wiring in between. You can temporarily ground the sensors for testing. When I was reading up on references, I found that they're basically (and allegedly) cleaned up signals only to be seen with an O-scope.
Those diagrams make it seem like the ICM gets grounded through the body of the module, so make sure that's clean, too.
 
8

81cutlass

Royal Smart Person
Feb 16, 2009
1,741
2,710
113
Western MN
Well I got an answer from the Dynamic EFI guy that that resistance wire in the diagram must be wrong and not to worry about it.

I ended up changing injectors again on #4 to another one off the shelf and it seemed to fix it. I had changed that one a month ago so its odd I put a bad one in but I guess thats the luck of the draw.

Put a new battery in it, had to fix a pinched injector wire that was causing the short and popped fuse from me being dumb and using an impact to tighten the fuel rails down instead of a hand wrench.

Overall its back to 100% I think.

Next thing is fixed the blown up muffler from when it was backfiring. Its factory 2" exhaust and I have a 2.5" ultra flow knockoff sitting on the floor, I might get a pair of 2 to 2.5" adapters and make it fit. Factory muffler is center inlet and offset outlet, and my muffler is offset inlet and outlet so making it fit might be a little odd, but I have a welder and saw so that solves a lot of problems.
 

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