I got a low mileage 5.3 from a 1999 silverado and installed it into my 03 yukon. I swapped the intake, manifolds, oil sender and the install went smooth. But it won't start, it cranks over fine, tested the crank sensor, has good fuel pressure but no spark, any ideas?
VATS needs to be turned off.
1951 3100
1984 C10
Wouldn't the security light be on?
This is true.. fuel lines backwards? I did that once
1951 3100
1984 C10
Has fuel pressure, just no spark.Originally Posted by ducky
i could be wrong but arent the 99-02 computers different than 03+ ??? i cant tell for sure from your post but it seems like all you did was swap the motor only.... if you changed the harness and pcm then nevermind.
but i also had the same problem when i first tried starting mine. it was a missing ground. yes one single ground wire prevented spark. the one apararantly a lot of people miss. its on the driver side of the block down low. check ALL your grounds as they are VERY important.
as soon as i connected it, she fired right up. good luck
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