Technician A is preparing to recover the refrigerant from a customer’s vehicle. What are the steps he should take when performing this service?

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Technician A is preparing to recover the refrigerant from a customer’s vehicle. What are the steps he should take when performing this service?
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Technician A completed a compression test, noting high readings suggest an exhaust restriction, while Technician B says the test checks volumetric efficiency.
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All four cylinders are below specification by about the same amount. After performing a wet compression test, values remained unchanged. What could cause this condition?
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And the most misdiagnosed.
Technician A and Technician B are discussing ways to use fuel trim as a troubleshooting aid. Technician A says that fuel trims that are correcting for a lean condition at high RPM and load conditions indicates a problem in fuel delivery. Technician B says that this condition is caused by a vacuum leak.
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Technician A is diagnosing a misfire. He states that a misfire is caused by a fault in the ignition system and that new plugs and coils will repair the problem. Technician B says that a misfire is detected when the ECM detects a variation in crankshaft speed.
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