Backfire Diagnostics🔗
Note
- Backfire is when the fuel is igniting in the intake manifold, or in the exhaust system, making a loud popping noise.
| Checks | Action |
|---|---|
| Preliminary Checks | N/A |
| Ignition System Checks | - Check for proper ignition timing - Check the connection at the ignition coils - Check the resistance (ohms) of the spark plug wires. If any wires have a reading of over 29,000 ohms, replace those wires. Remove the plugs and inspect them for any of the below conditions: - Improper gap - Any and all deposits - Wet plugs - Cracks - Burned electrodes |
| Engine Mechanical Checks | Check the engine for any of the below conditions: - Sticking or leaking valves - Exhaust system leaks - Improper valve timing - Engine compression - Sticking or leaking valves - Manifold vacuum leaks |
| Fuel System Checks | - Perform a fuel system diagnostics check (Refer to the Fuel System Diagnostics section of the manual). |