11. Unfavorable rotation speed or flameout during acceleration Common trouble location: 1. Fuel with water; 2. Intake air pressure sensor and throttle position sensor; 3. Spark plug; 4. Throttle body and idle speed by-pass air way; 5. Intake air way; 6. Idle speed regulator; 7. Fuel injector; 8. Ignition timing; 9. Exhaust pipe. Diagnosis Flow Table 1-77 99 S/N Operation Test Results Actions 1 Check if the air filter is blocked. Yes Check and repair air intake system No Next step 2 Connect the fuel pressure gauge (the connection point is the front end of the intake pipe of the fuel distribution pipe assembly), and start the engine.
Check if the fuel pressure of the engine under full working condition is about 350kPa. Yes Next step No Check and repair fuel supply system 3 Check the spark plug for each cylinder. Check if its model and gap can meet with starndards. Yes Next step No Adjust or replace 4 Remove the idle speed regulator. Check the throttle body, idle speed regulator, and idle speed by-pass air way for carbon deposition. Yes Wash relevant parts No Next step 5 Check the intake air pressure sensor, throttle position sensor and the lines for normal operation. Yes Next step No Replace sensor 6 Remove the fuel injector. Check the fuel injector for leakage or blockage with a special fuel injector cleaner & analyzer.
Yes Remove the trouble No Next step 7 Check the fuel for normal operation. Yes Replace fuel No Next step 8 Check if the ignition sequence and timing of the engine can meet with the standards. Yes Next step No Check and repair ignition timing