Lly no start after engine swap

Sethdavis09

New member
Nov 14, 2022
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Got a shit show of a lly, story goes as follows. Had blown hg for years and motor finally let go, they swapped motors to a used one, couldn’t get it running come to find out motor was apart and never reassembled completely. Then a different guy took it down to short block and half way assembled it back.

Well now it’s in my hands, got it back together enough to run. Seems to be slow cranking with no ecm and tcm communication with scanner, so I’m guessing I’m getting no fire from injectors.

Been digging into the wiring harness, seems I’m getting + voltage through the tcm ground wire (black and white pin 1). When plugged in the tcm will short out if touched to a ground.

I’ve had no luck on a diagram just a pinout for tcm. Any ideas?