Sandys Regal (2.0 Turbo Ecotec) broke a chain guide. So, I replaced all guides, chain and tensioner. Then it started throwing P0016 and P0017 codes. Basically a disagreement between cams and crank. So, tore it down again and it appears I was off by two teeth somehow. When I attempted to realign, I can’t get the chain to line up properly. If I am on the Intake timing mark, then I am two teeth off on the crank pulley and vice versa. Procedure is to put motor at TDC on Exhaust stroke. Which means the cams are still under load. Could I have inadvertently allowed the Intake cam to roll forward by two teeth? Thoughts?