Vvt
Now that we know it's not the VVT unit itself that's malfunctioning – just being made to be noisy by an outside cause – checking the codes is indeed the next step. I'm not sure what you mean by 'pulleys'. I know what the word means of course, in a much older car (the ones I'm used to) that's what the fan belt runs around, but I can't see how that would make the VVT unit (nowhere near any pulleys or belt) go noisy. Although this Volvo is 20 years old, to me it's a modern car using technology beyond my knowledge!
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