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Q:Would a clogged pcv valve cause smoke at idle?
A:Happy to help you with your question Boo. The PVC valve vents crank case vapor so if it is backed up it the vapors can get into the combustion chamber and possibly cause smoke from the exhaust. You may also want to see what color the smoke is that can be an indication of what is being burn and will tell you where to look. This link would be a general guide. http://www.autoguide.com/auto-news/2013/01/what-does-the-smoke-from-my-exhaust-mean.html