An engine in good condition should have about ________ in. Hg. vacuum at idle.

Question

Quizplus · Accepted Answer

A vacuum gauge reading between 17 to 21 in. Hg. at idle indicates that the engine is running smoothly and efficiently. A reading below 15 may indicate a problem with the engine, while a reading above 21 may indicate a problem with the vacuum system or a possible vacuum leak. A reading of 10 to 12 in. Hg. may indicate worn rings, valves, or a clogged exhaust system. At least 29 in. Hg. vacuum reading may indicate a problem with the gauge or a problematic throttle body.

An Engine in Good Condition Should Have About ________ In Hg