Noise randomly appeared after taking the valve cover off to replace the VTC spring and check valve clearances. Nothing has been dropped into the engine, runs perfectly fine and and shows no codes.
It's interminnent, seems to come and go on it's own regardless of engine temperature. Frequency raises with RPMs, persists even when when ran without accessory belt. Chain and guides aren't worn, haven't checked the tensioner yet. Seems to be coming from driver's side behind the engine. There's slight scoring on one of the exhaust lobes but using the old screwdriver trick showed it's not coming from the valvetrain as I could only hear the usual cam/valve noise.
It's interminnent, seems to come and go on it's own regardless of engine temperature. Frequency raises with RPMs, persists even when when ran without accessory belt. Chain and guides aren't worn, haven't checked the tensioner yet. Seems to be coming from driver's side behind the engine. There's slight scoring on one of the exhaust lobes but using the old screwdriver trick showed it's not coming from the valvetrain as I could only hear the usual cam/valve noise.
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