43K views · 369 reactions | How to Perform a Compression Test. 1.Remove one spark plug and make a note of which cylinder it is. 2.Install the adapter that matches the plug threads into the cylinder head. 3.The adapter needs to seal to the head. 4.Crank the engine using the starter. 5.Read the gauge and take note of the pressure #reels #mechanic #engine #compression #fypシ | Car Tips Tv | Facebook