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Engine Controls - Tests W/o Codes: Other Ford Aspire I

Testing & Diagnostics ~403 words

BACKFIRE THROUGH INDUCTION OR EXHAUST

  1. Check mass airflow meter.
  2. Check idle air control solenoid.

DIESELING (RUN-ON)

  1. Check idle air control solenoid.

LACK OF POWER

  1. Check mass airflow meter.
  2. Check throttle position switch.
  3. Check exhaust gas oxygen sensor.
  4. Check A/C switch.

SPARK KNOCK (PINGING)

  1. Verify ignition timing is correct.
  2. Check mass airflow meter.

STALLS/QUITS

  1. Check mass airflow meter.
  2. Check idle air control solenoid.
  3. Check pressure regulator control solenoid.
  4. Check exhaust gas oxygen sensor.
  5. Check engine coolant temperature sensor.

STUMBLE/HESITATION DURING ACCELERATION

  1. Check throttle position switch.
  2. Check mass airflow meter.
  3. Check canister purge control solenoid.
  4. Check heated exhaust gas oxygen sensor.
  5. Check A/C thermostatic switch.

MISSES/SURGES

  1. Check exhaust gas oxygen sensor.
  2. Check throttle position switch.
  3. Check mass airflow meter.
  4. Check engine coolant temperature sensor.

IDLE IS FAST/SLOW RETURN TO IDLE

  1. Check idle air control solenoid.
  2. Check by-pass air control valve.
  3. Check engine coolant temperature sensor.

IDLE IS ROUGH

  1. Check idle air control solenoid.
  2. Check by-pass air control valve.
  3. Check throttle position switch.
  4. Check mass airflow meter.
  5. Check intake air temperature sensor.
  6. Check canister purge control solenoid.
  7. Check engine cooling fan.
  8. Check headlight switch.
  9. Check blower control switch.
  10. Check A/C thermostatic switch.
  11. Check neutral safety switch (A/T).
  12. Check neutral gear switch or clutch engage switch (M/T).
  13. Check exhaust gas oxygen sensor.

ENGINE SPEEDS UP

  1. Check idle air control solenoid.
  2. Check exhaust gas oxygen sensor.
  3. Check by-pass air control valve.

CRANKS NORMALLY/NO START

  1. Ensure secondary ignition spark is present.
  2. Ensure fuel pressure is within specification.
  3. Check mass airflow meter.
  4. Check engine coolant temperature sensor.

CRANKS NORMALLY/SLOW TO START

  1. Check ignition module.
  2. Check engine coolant temperature sensor.
  3. Check mass airflow meter.
  4. Check evaporative emission control components.

POOR FUEL ECONOMY

  1. Ensure intake air is not restricted.
  2. Ensure fuel pressure is within specification.
  3. Check ignition module.
  4. Check canister purge control solenoid.
  5. Check intake air temperature sensor.
  6. Check mass airflow meter.
  7. Check exhaust gas oxygen sensor.

EXHAUST SMOKE/ODOR

  1. Check intake air temperature sensor.
  2. Check mass airflow meter.
  3. Check exhaust gas oxygen sensor.

FUEL ODOR/LEAKS

  1. Check evaporative emission control components.
  2. Check rollover vent valve.
  3. Check by-pass air control valve.

Intermittent Simulation

To reproduce conditions creating an intermittent fault, use following methods

  1. Lightly vibrate component.
  2. Heat component.
  3. Wiggle or bend wiring harness.
  4. Spray component with water mist.
  5. Remove/apply vacuum source.

Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for self-diagnostic codes. Use test results to identify a faulty component or circuit.

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