ENGINE BACKFIRES
POSSIBLE CAUSE
SOLUTION
Out of fuel
Refuel
Weak spark from spark plug
Inspect, clean and/or replace spark
plugs
Incorrect spark plug gap or heat
range
Set gap to specs or replace plugs
Old or non-recommended fuel
Replace with fresh recommended
fuel
Incorrectly installed spark plug wires
See your dealer
Incorrect ignition timing
See your dealer
Loose ignition connections
Check all connections and tighten
Water present in fuel
Replace with fresh recommended
fuel
Exhaust leak
Check all connections
Mechanical failure
See your dealer
ENGINE PINGS OR KNOCKS
POSSIBLE CAUSE
SOLUTION
Poor quality or low octane fuel
Replace with recommended fuel
Incorrect ignition timing
See your dealer
Incorrect spark plug gap or heat
range
Set gap to specs or replace plugs
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