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Engine will not crank, no spark or fuel pump after engine swap?

Tiny
JOHN'S HEADACHE
  • MEMBER
  • 2003 GMC SIERRA
  • 5.3L
  • 100,000 MILES
Just removed blown up 6.0l ls and replaced with a 5.3l ls from a 2007 Chevrolet Tahoe now engine wont crank, no spark or fuel pump. Used the original harness and computer.
Tuesday, May 2nd, 2023 AT 6:01 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Please double check the main engine ground to the wiring harness, here is the location so you can see what I am talking about. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Wednesday, May 3rd, 2023 AT 10:16 AM

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