air1jpg
Well-known member
I am hearing a little valve chatter when the engine is overnight cold on light acceloration. The chatter will go away when the engine reaches about 120 degrees. Could it be a small problem?
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The problem is very unlikely to be detonation.
The problem is also unlikely to be "valve clatter".
I suspect it's "cold piston knock" and, unless it's really loud or it does not go away once the engine reaches normal coolant temp, it's unlikely to be a problem.
Change from a 5W30 to a 10W30 synthetic oil then road test the car to see if the noise changes.