The causes of why an engine makes a knock noise when it is idling.
Mechanical Knock or Detonation Knock
Mechanical Knock: A mechanical component is broken.
Rod Knock (Lower half of engine speeds up with engine RPM. Rod knocks are usually a "thud" dull sound.)
Valves (Top of engine more clacking sound than knocking.)
Lifter Tap Knocks (Top of engine Lifters are usually high pitched and a "clean" tap sound.
Possible Causes
Dirty or Low Oil
Bad oil pump
Wear and tear
Detonation Knock: Something causing the cylinder to fire early.
Engine Timing Off
Bad or slipped timing belt or chain
Bad Cam or Crank Position sensor
Bad Knock Sensor
Carbon Deposits
Engine often continues to run when shut off.
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