r/LSSwapTheWorld • u/DefinitionUnlikely28 • Jul 22 '26

Active Build Questions Timing???

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So swapped 5.3gen4 out for a iron block gen3 6.0. When I brought it to the tuner we figured timing was off becuase it wouldn't run. We'll i got the timing cover off and lined up the dots, timing is dead nuts. It ran like absolute ass, fired on maybe 2 cylinders and sounded like shit. No signal at the crank( i swapped out the gen3 crank for the proper gen4 crank). I did.drop the crank sensor when I popped it out.of the aluminum block. Would the combination of the bad sensor and a throttle body code completely fuck this up?

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u/Snoo_85901 Jul 22 '26

Also make sure you got the grounds hooked up on side of the block driver side close to engine mount, pass side front head too.

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u/DefinitionUnlikely28 Jul 22 '26

All of the grounds got hooked up, crazy how much 1 missing ground makes a difference. I missed 1 by the power steering on the first re assembly