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Thank you all for the reply. But what I need more clarification is about the sounds related to spark knock.
@Evil-I, I agree most of your assessment regarding the PCV valve and oil consumption. But if you do a search regarding the causes of oil consumption, the pcv valve is very often mentioned as the cause of oil consumption.
I’m not worry about my engine burning oil. Because 1qrt / 3k miles it’s not a really a big deal. But It’s just weird that my car burns oil only in the hwy driving and I was also curious about how people come to conclusion that bad pcv valve can cause the increasing oil consumption. that’s all.
Thanks Rob781 for the advices.
The spark plugs are fine and the compression are good as well.
https://www.ericthecarguy.com/kunena/8-Service-and-Repair-Questions-Answered-Here/64024-what-do-you-think-about-these-plugsOk. It makes sense. And thanks again for your very thoughtful and detailed explanations.
The reason why I need to know how the PCV valve works because my car, a 2000 Honda civic, burns about 1qt/3k miles of oil if I drive almost exclusively in the hwy. But it burns almost nothing if it was uniquely city driving. This is why I suspect the PCV valve has to do with this odd oil consumption pattern.
Thank Evil-I for the explanation. I have pretty good idea how the PCV works. But what is still bugging me is I try to understand how a bad PCV valve can increase engine oil consumption.
Hey Hockeyclark. Really thank for your very detailed explanation. I however still need your explanation about little thing.
Actually, what I understand about the PCV valve is it “communicates” between the crankcase and the intake manifold. I also understand this is “one way” flow (air from the crankcase to the intake manifold). The spring inside of pcv valve blocks only the air back to the crankcase. So when the vacuum is high inside of intake manifold (idle, deceleration ) , I don’t see anything that block the air from crankcase to the intake manifold. Am I missing something ?