Em Em

Engine backfires

EFI system problem Vacuum leak

• Intake manifold (Air intake chamber)

• Intake air control valve

• Throttle body

• Brake booster line

Pulling in air between air flow meter and throttle body Insufficient fuel flow Incorrect ignition timing Incorrect valve clearance Carbon deposits in combustion chambers

Repair as necessary Check hoses and repair as

Repair as necessary

Troubleshoot fuel system Reset timing Adjust valve clearance Inspect cylinder head

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