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VVT ?????????? Is that new ?

And yes the engine is louder in cold weather.........like all engine by the way!
 

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I've noticed that louder engine noise when the weather is colder. My car sits outside overnight at work. I have a short freeway drive exiting from work, and I notice the louder engine noise at highway speeds. The vehicle probably isn't warmed up at that point. The rest of the drive home is on city streets, and I don't know that I hear the noise then. Not sure if it's speed related,or if the engine hasn't warmed up.
 

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Maybe pistol slap, but that usually goes away after the block heats up. I had that on a Mazda MPV, poor engineering, the piston was too small.
 
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