Engine Backfires
Possible Cause
Weak spark from spark plugs
Incorrect spark plug gap or heat range
Old or non-recommended fuel
Incorrectly installed spark plug wires
Incorrect ignition timing
Mechanical failure
Speed limiter malfunction
Other mechanical failure
Possible Lean or Rich fuel mixture
Low or contaminated fuel
Low octane fuel
Clogged fuel filter
Fuel is very high octane
Vehicle Issue Diagnosis
Solution
Inspect and replace spark plugs as necessary
Set gap to specs or replace plugs
Replace with minimum 89 octane unleaded fuel
See your dealer
See your dealer
See your dealer
See your dealer
See your dealer
See your dealer
Add or change fuel, clean the fuel system
Replace with minimum 89 octane unleaded fuel
Replace filter
Replace with minimum 89 octane unleaded fuel
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