An engine with poor compression in one or more cylinders can be quickly identified using the relative compression test. To perform the relative compression test, the fuel system must be disabled to …

With a relative compression test can easily be determined whether all cylinders of an engine have the same compression. This relative compression test uses the starter motor current to determine the …

Jun 21, 2022 · Having a hard time diagnosing misfires due to a compression issue? In this Diagnostic Quick Tip, National Field Trainer Jason Gabrenas shows you how to find the problem cylinder using …

Jul 30, 2025 · With a relative compression test, you can easily determine if all the cylinders in an engine have equal compression. This test is a quick compression check that you can do without removing …

Follow along as Master Trainer Mark Kenyon of Garage Gurus demonstrates how to set up an oscilloscope to perform a relative compression test.

Oct 23, 2024 · We test drive them in real‑world conditions. We give you honest, experience, based guidance, like we would for our own family. If you’re thinking about buying a used vehicle, bringing it …

May 30, 2024 · The relative compression test is a quick-and-dirty way to check compression in an engine. Unlike a traditional compression test, this test doesn’t actually measure the pressure within …

Apr 18, 2019 · We begin our review of Relative Compression with a thorough overview from Mike at NGK Technical Testing. Additional videos show how to do RC testing using Current, Voltage, the …

Oct 9, 2024 · Today I can sit in the driver’s seat and click a few icons on my laptop screen and have the car run a relative compression test. It will disable the fuel injection, engage the starter, look at battery …

The purpose of the Relative Compression test is to examine and compare engine cylinder condition by observing the electrical current being drawn by the starter motor during engine cranking.