Final answer:
An increase in compression readings during a compression test can indicate carbon build-up on piston heads or could signify that a new or recently overhauled engine is breaking in. Consistent increases across cylinders or significant variances can aid in diagnosing potential issues. Seeking a qualified mechanic for proper diagnosis and service is recommended.
Step-by-step explanation:
If there is an increase in compression readings during a compression test on an engine, it could indicate a number of potential issues. A compression test measures the ability of the engine cylinders to hold pressure, and it's important for the efficient operation of the vehicle's engine. An increase in compression can sometimes be due to carbon build-up on the piston heads, which effectively reduces the cylinder volume and increases the pressure. This might appear favorable in terms of higher compression, but it can lead to pre-ignition problems and potentially damaging knocking or pinging sounds. In addition, too much carbon build-up can eventually result in engine inefficiency and possible engine damage. If the increases are slight and uniform across cylinders, it could simply mean the engine is breaking in, especially if it is a new engine or has been recently overhauled.
To accurately diagnose the problem, it should be considered whether the compression increase is consistent across all cylinders or if there is a significant variance. Regular maintenance and addressing issues promptly can help prevent long-term damage and ensure the vehicle runs smoothly. Consequently, if an increase in compression is observed, it's advisable to seek further diagnosis and potential servicing of the engine by a qualified mechanic to address the issue appropriately.