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1. Start the engine and turn it to normal operating temperature, turn off the engine and remove all spark plugs after the engine stops running.
2. With the throttle fully open, press the connector of the pressure gauge onto the spark plug hole.
3. Use the motor to drive the engine to rotate at 100-150r/min for 3-5 seconds. At this time, the pointer on the instrument will gradually rise and stop at a certain value, and the indicated value is the compression pressure of the cylinder.
4. Repeat the above steps for 2-3 times to improve the measurement accuracy.
Angela
Reviewed in the United States on August 22, 2024
If you own a Duramax and work on it yourself, this is a must have tool.
Ryan Slater
Reviewed in the United States on February 29, 2024
Got this for testing the vacuum on a duramax 6.6l. Did the job.
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