cylinders 1,4,6 and 7 not firing. gen 3.

04 silverado SS. new build . engine will start and idle only. Cylinders 1,4,6 and 7 are not firing. Non DOD Engine. No signal to coil to fire. I have double checked coil grounds, ecm supplied ground and coil voltage supply. no herz signal to fire coil being delivered to these 4 cylinders. verified CKP sensor voltage. RPM is reading on tach and scan tool. Looking to see if anyone has ever encountered this issue?

new crank? seen this before with crankshaft reluctor wheel being installed backwards or bent.

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Originally Posted by dangrebel

new crank? seen this before with crankshaft reluctor wheel being installed backwards or bent.

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that is what i am afraid of. when you had seen this before did it cause the coils not to see a signal to fire?

you nailed it. reluctor wheel was on backwards. K1 technologies Crankshaft out of the box.