Engine Controls - Tests W/O Codes: Symptoms: Backfiring

Check listed items as follows:

• Check for vacuum leaks.
• Ensure ignition timing is correct.
• Ensure timing belt or chain has not jumped.
• Check distributor.
• Ensure fuel injectors are not leaking.
• Check spark plugs and plug wires.
• Check ignition and coil circuit.
• Check crank and cam sensors.
• Check TP sensor and connector.
• Check exhaust system.