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Having the same issue. I was throwing a solid CEL and 1531 code, meaning variance on Bank #1. I assumed it might be the IMS, since I got the car over a year ago with no maintenance documents. Had no idea if it was ever done. Just finished putting the new IMS bearing in and the old one looked fine. No wear apparent, but it was filled with engine oil, so just a matter of time. I feel better knowing what's in there now.
When I locked it at top dead and put the cam lock on, everything lined up perfect. Where might the deviation be? Wear pads?
Getting ready to button it back up, check cam timing again, and give it a go.
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