B) weak piston rings
What is compression test?
One of the basic engine-diagnostic procedures that can be run is an engine compression test. All of the cylinders must have the same compression for the engine to run smoothly. There are just three possible ways for air to leak out of an engine and cause compression loss.
- Exhaust or intake valve
- Engine rings (or piston, if there is a hole)
- An engine's head gasket
The procedures for conducting a compression test
The engine should be warmed to its typical operating temperature before testing in order to achieve the best results. The following procedures should be followed for an accurate compression test:
- STEP 1: Dispose of each spark plug. As a result, the engine can be turned up to the same speed. Label all spark plug wires accurately.
- STEP 2 is to block the throttle open. This enables the engine to pull in the most air possible. Additionally, this step guarantees reliable compression test results.
- STEP 3 After inserting a compression gauge into a spark plug hole, start the engine.
- Four compression strokes of engine cranking should be performed in total. A puffing sound is produced after each compression stroke.
- EXAMPLE-If the ultimate, maximum value is 150 PSI, for instance, the reading following the first puff should be greater than 75 PSI. Low first-puff readings could be a sign of weak piston rings.
- STEP 4 Keep track of the highest readings, then compare the outcomes.
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