I'm working on a 2001 chevy express van with a V8 5.7 L engine. The original engine had problems with cylinder # 3 and I found another '98 model V8 5.7 L engine that was running, low mileage and in great shape so I put it into the van. Now I'm having an issue with the a check engine light code "P1345"; it is a crank sensor / cam sensor correlation code. I purchased and installed a new distributor and the issue remained, so I installed a new crank sensor...to no avail, the problem is still there. Prior to installing the new crank sensor, the check engine light would go off periodically. Since I installed the crank sensor, it has remained on constant...for about 3 weeks now. Any suggestions?

You need to get access to a scantool or laptop that can read live data or take it to the dealer and they can fix it.
Here is a good video on the explanation of this and how its actually done.

You need a scan tool. The computer is very picky. Your distributor is out of spec. It needs to be moved a little. I had the issue after my engine rebuild.

its called cam retard offset and you can find someone with a mid grade scanner to set it you dont need to pay dealership price. i got mine done for 25 bucks

Thank you gentlemen, you were right on the money. My buddy and I set the cam retard to 0 deg and that did resolve the issue. Now on to the next challenge... my suburban and the airbag code...apparently the little black box is out.

What is the air bag code and what year suburban is it?

Please start a new thread about the suburban'* airbag issue. It will prevent confusion. Thank you.

@carfixer007 @CathedralCub @Mike