Exam 8: Engine and Misfire Diagnosis

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When should a wet compression test be performed?

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Which of the following is LEAST likely to create a rattle sound?

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Technician A says a low but steady idle vacuum reading indicates a sticking valve. Technician B says a fluctuating vacuum gauge reading indicates incorrect ignition timing. Which technician is correct?

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Which of the following is NOT likely to be an engine mechanical fault?

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Exhaust back pressure of an engine running at idle should be ________.

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When preparing for a compression test, technician A disables the ignition system. Technician B only removes the spark plug for the cylinder he is testing. Which technician is correct?

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How could a technician pinpoint a noise made by a defective rod bearing?

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A misfire is detected by what sensor(s)?

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Technician A says low oil pressure causes engine wear. Technician B says engine wear can cause low oil pressure. Which technician is correct?

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Engine oil pressure is being measured. A good engine should be able to produce how much oil pressure?

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A cylinder power balance test is performed. Cylinders 1, 2, and 3, all drop 175 RPM when disabled with a scan tool. Cylinder 4 drops 50 RPM when disabled. The following statements are all correct EXCEPT ________.

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Which noise is most noticeable at idle?

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What does blue exhaust smoke indicate?

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A good engine should produce how much compression during a running (dynamic) compression test?

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What does black exhaust smoke indicate?

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What does white smoke exhaust smoke indicate?

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A cylinder contribution test is performed using a ________.

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