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Hi There, I'm Clayso a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
From your description sounds like you have the Camshaft Position (CMP) sensor out of time and sync. The link below is the correct way to install the oil pump drive.
Camshaft Position Sensor Service and RepairIf this service procedure doesn't match you application let me know your VIN.
With the oil pump drive removed the cam has no way to operate the oil pump. With the number 1 cylinder set at top dead center on the compression stroke install the oil pump drive with a toothpick through the shutter ring. Looking down into the engine with the oil pump drive removed you can see the oil pump. You will have to turn the oil pump with a long flat screwdriver to get it to line up with the oil pump drive. A professional level scan tool is required to set the sync for the CMP sensor, but with the CMP connector parallelled with the side of the block it should start and run without backfiring.
I hope this information is helpful. If you have any questions let me know. You can reply back to me through this thread at any time.
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