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Home › BMW › 1994 › 740i › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/O Codes - 4.0L V8 › Symptoms › Engine Backfires

Engine Backfires

Air leak into/from exhaust system.
Intake manifold vacuum leak.
Burned valve.
Lean air/fuel mixture.
Incorrect ignition timing.
Incorrect valve timing.