A Technician Is Testing a Fuel Injection System with a Scan

question 19

Multiple Choice

A technician is testing a fuel injection system with a scan tool. While the engine is running in closed loop, he loosens a vacuum hose to create a small vacuum leak. Initially the STFT rises and the LTFT remains unchanged. After a few minutes the STFT returns to near zero and the LTFT rises. This test proves that ______.

• A)the system is running rich
• B)the system is running lean
• C)the O₂S sensor is faulty
• D)the system is working normally

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Definitions:

Strengths and Weaknesses

An assessment or analysis of the positive attributes and limitations of an entity, such as an organization, individual, or system.

Critical

Inclined to find fault or judge with severity, often too readily, involving analysis and evaluation.

Talk Therapy

A form of psychotherapy that involves discussing one's feelings, thoughts, and behaviors with a therapist to gain insight, resolve problems, or improve mental health.

Listening Therapy

A therapeutic approach that uses the act of listening to sound, music, or spoken word to improve physical or psychological conditions, often related to auditory processing issues or emotional wellbeing.