Title: Perform cylinder cranking and running compression tests; determine needed action.
Course: Automotive Technology III (20104-III) > Section: ENGINE PERFORMANCE: General

Performance should include

- installing the compression gauge with the Schrader valve removed
- using specialized tools
- analyzing data to determine the necessary action
- referring to service materials and following manufacturer guidelines.

Process/Skill Questions:

- What is the percentage of cylinder variation on a cranking test?
- What is the purpose of performing a running compression test?
- Why should the throttle be open while performing a cranking compression test?
- What is the purpose of performing a wet compression test?