CONTENTS
SHARP, METALLIC, RAPPING NOISE
MUFFLED, BELL-LIKE SOUNDCONTENTS
SOUNDS
UNDERHOOD
RHYTHMIC
ENGINE BACKFIRES
CONDITION(S)
- ENGINE BACKFIRES; LOUD BANG OR POP HEARD
- SOUND COMES FROM EXHAUST PIPE
POTENTIAL CAUSE(S)
CHECK THESE FIRST:
1. INCORRECT IGNITION TIMING
Have ignition timing professionally adjusted.2. SPARK PLUG WIRES CROSS-FIRING OR INCORRECTLY CONNECTED
Separate and correctly connect spark plug wires; do not run close and parallel.3. CRACKED DISTRIBUTOR CAP
Replace distributor cap.4. FAULTY CARBURETOR ACCELERATOR PUMP
Have carburetor accelerator pump professionally replaced.CHECK THESE NEXT:
5. EXHAUST SYSTEM LEAKAGE
Have exhaust system leak professionally repaired.6. FAULTY AIR INJECTION SYSTEM
Have air injection system professionally replaced.7. FAULTY INTAKE VALVE
Have intake valve professionally replaced.CHECK THESE LAST:
8. WEAK OR BROKEN VALVE SPRINGS
Have valve springs professionally replaced.9. LOOSE OR WORN TIMING GEAR OR CHAIN
Have timing gear or chain professionally serviced.10. LEAKING CARBURETOR GASKET
Have carburetor gasket professionally replaced.
CONTENTS SHARP, METALLIC, RAPPING NOISE MUFFLED, BELL-LIKE SOUND