Truck starts for a sec then dies evertime
I swapped the 4.3 in my 97 Chevy chenne with a 5.7 out of a 99 Chevy surburban 4x4 switched engine wiring harness too got it to start but dies in a sec or 2 what did I do wrong
Gotta swap everything, like computers, Body Control Module, immobilizer, keys, all those things at the same time (not everything is included in engine wiring harness). Even back in 1997, those things had over-current protection on pretty much every circuit, so will shut down after a brief start. Pretty much every model coming out at about that time, they changed things around, changed the spec's, etc. I don't think you killed anything, but you need to keep every box, every module with the engine when you swap... and they love to hide those things where nobody looks! Older vehicles didn't have such smarts and we could just swap engines and expect things to work with slight adjustments. Get hold of the full diagram and check every single thing was included in that harness, right down to injectors.
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