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Slippage of the pulley will not change the cam and ignition timing in any way. It will only change what you read on the timing light because only the outer part of the pulley that has the timing mark on it will have moved. Even though the outer pulley slips the small cogged pulley behind it which drives the timing belt stays as it was.
I would not pursue O2 sensor or mixture at this time as that will not change the timing. Likewise coolant temp sensor and knock sensor as they will only initiate slight timing changes in the order a few degrees. Something is causing that apparent or real timing error of 23 degrees. Solve that first.
I would recheck the timing of the camshaft more carefully by removing the front timing belt cover (actually you do not even have to remove it just loosen and pull back at the top and you can line up the mark), line engine up to TDC according to timing mark on the crank pulley then check that cam is timed according to it's mark. I think that taking a visual on the cam lobes may not be accurate enough. Remember that a 23 degree error at the crank will only be a 12.5 degree error at the cam and thats not much to see when you are eyeballing those egg shaped cams.
Is it possible that mechanic did something weird such as slip the chopper disk that the hall sensor reads to get the timing he wanted? I am not sure how this could be done because I should think the engine would then ping like crazy.
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David Hunter
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