Hey guys, I’ve just finished up the 5.3 swap in my ‘97 c1500. (The LS harness is integrated into the factory one. 0411 pcm) After the usual amount of complications and challenges the build finished up well. Everything is new, from the radiator to the differential cover. Nothing came off a donor vehicle. The only small issue I’m having is that 6 out of 10 times when I go to start it, it doesn’t immediately fire on the FIRST key turn. It will crank as long as I hold the key engaged but not fire. (Not a fuel pressure issue) If it doesn’t fire in the first 2 seconds or so I can turn the key back one position then immediately re-engage the starter and it pops right off. It’s very strange. The other 4 out of 10 times, it busts right off. Anyone ever run across this? It’s not a huge problem, it’s just not right. Any thoughts?
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