Engine Compression & Cooling System Tools

What does a steady, rapid needle vibration between 14 and 19 in-Hg on an Engine Vacuum Gauge indicate?

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 Correct IncorrectA worn valve guide or leaking/sticking valve that flickers open each time that specific cylinder fires.

What does a steady, rapid needle vibration between 14 and 19 in-Hg on an Engine Vacuum Gauge indicate?

• A clogged air filter element
• A loose alternator fan belt
• Normal engine operation with new oil
• A leaking, sticking, or burnt valve, or worn valve guides causing rapid oscillating vacuum leaks