They run the engine until it reaches normal working temperature. After this, they remove all sparkplug leads. They label every lead to avoid confusion.
The team worker presses the accelerator pedal down to open the throttle completely and turns the ignition switch to crank the starter.
The worker either removes a cylinder sparkplug and screw or pushes the connector of the compression tester within the hole of sparkplug. They hold it firmly and with care to prevent leaks.
In case your vehicle is running roughly, there are chances that the one or more cylinders are lack in pressure. If you want to determine that pressure is leaking from the engine, you have to check the compression in the cylinders using compression gauge. A compression gauge is a professional tool used to measure the amount of pressure exerted by piston on the fuel/air mixture prior the spark plug fires the mixture.
You can easily afford these gauges and use them. The next question comes – how to use gauges? Here are the steps to use compression gauge-
- Make someone sit in the driver’s seat with the engine off, the parking brake on, and gearshift in neutral.
- If you have on vehicles with distributors- you need to pull the big wire that leads to the coil through the distributor cap’s center. Lean the metal connector against uncounted surface away from spark plugs.
- If you have on vehicles with distributor-less ignitions – disconnect the electric connector at ignition control module. In case you are unsure how to disconnect or what to disconnect, talk to expert.
- Disable fuel injection system.
- Label and remove the boots connecting each spark plug wire and plug.
- Remove all the spark plugs.
- Connect starter switch to battery.
- Insert compression gauge.
- Crank the engine.
- Take reading of the gauge and reset it.
You can repeat these steps for each of other cylinders.
For any clarity or query for compression testing machine, you can any time reach to the experts.