Azera(TG)3.3/poor acceleration and hesitation

Model: Azera (TG)	Year model: 2008	Mileage: 79689km
Displacement: 33000cc	Fuel: Gasoline	T/A Auto

Subject: Poor Acceleration and Hesitation

1) Condition:

• Poor Engine Acceleration and Hesitation.

2)Cause:

• Surge tank misassembled after the spark plug are replaced which cause air leaking

3) Diagnosis:

• Scan tool check
  = Diagnosis trouble code.

Code	Items
P0100	Air flow sensor malfunction

• Current data shows the injection time from injector which is longer than Spec. at Idling (4ms).
• AFS output signal is 1567 mV at ignition ON this data is higher than specification.
• After changing the AFS, poor accelerating is disappeared, but the engine is still unstable and air leaking noise at idling.
• Cleaning spray (W40) is sprayed  toward surge tank for leaking test.
  = Engine RPM is changed when spraying, which indicate air leakage.
• MORE STUDY

Airflow sensor                                                                Surge tank
4) Repair Guide:

• Reinstall the surge tank and replace the AFS.