Incomplete Combustion

DOES NOT START / INCOMPLETE COMBUSTION

Check in the order shown

1. Volume Air Flow Meter circuit.
2. Idle Speed Control Motor.
3. Fuel Pressure Regulator.
4. Engine Coolant Temperature Sensor circuit.
5. Compression.
6. Piston Ring.
7. Ignition timing.
8. timing Belt.
9. Injectors.
10. Engine Control Module.