Well timing on a volvo can some times a pain I would say start with ( with out looking at my self ) checking the timing belt or chain is not broken, by looking in side the oil fill cap at the cam shaft to see if it is moving. If the cam is moving it may have jumped time. you would need to reset the timing, also check your harmonic balencer for proper alingment to the crank shaft, and timing marks line up . look for timing mark alingment in your owner's manul.
hope this helps you if it dosen't please give me more information on your problem with the timing in detail.
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