5.3 Swap Ground Help
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5.3 Swap Ground Help
I have a 2003 5.3 that I have built a standalone harness for and installed in a 1971 International pickup. I am having trouble getting it running and need some help. The motor cranks and has fire to the injectors, and good fuel pressure. When I was testing the coils yesterday I accidently hit the ground wire on the harness for one of the coil packs and the engine sputtered and ran for about a two seconds. I have added some extra grounds and cleaned the existing ones and I still have the same problem. Does anyone have any ideas what to check next? It is entirely possible that I messed up when I was wiring the engine so I think that I am going to review my notes tonight. The computer was reprogrammed by LT1swaps.com and the VATs and other non needed things were removed. Thanks for any help.
Hudson
Hudson
#2
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Noid the injs when cranking. This will confirm that the crank side of the key sw is powering the system.
You could also check a plug when cranking. This will verify the coils are firing.
What do you mean: "hit 1 of the grnd wires"??
If I understand that, and the engine started, then the PCM is not pulling the neg side of the coils to ground.
You could also check a plug when cranking. This will verify the coils are firing.
What do you mean: "hit 1 of the grnd wires"??
If I understand that, and the engine started, then the PCM is not pulling the neg side of the coils to ground.