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A mod to get rid of vvt sprocket rattle or check if it's the sprocket making the noise
is ground the yellow wire going to the vvt solenoid, just 'T' into it and to ground will do
plenum support bolt is close and good earth/ground point
when grounded/earthed you will get full oil pressure to the sprocket constantly
you can run it like that to check if noise goes away but may notice loss of top end power after 5k revs
another thing is the oil feed drilling for the sprocket in the head is tiny
and it only needs a bit of engine crud to get in there and starve the pulley,
a good working sprocket can start to rattle after 100>500miles if
the oil feed is restricted
if oil spray bars for the rockers are blocked with engine crud
that's not a good sign regards the sprocket oil feed being clear and flowing oil
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