All of the following statements are true EXCEPT:

A. to quickly evaluate compression, listen during cranking for an even rhythm and then for a smooth idle.
B. an EGR valve is open at idle during normal operation.
C. when an EGR valve is opened by a vacuum pump, the engine should stumble and run roughly.
D. a vacuum gauge is easy to connect and can be used to qualify engine condition.


Answer: B

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