Valve adjustments are critical to the performance of your Toyota Corolla. The valves in your engine open and close to allow air and fuel mixture into the cylinders and exhaust gases out. Over time, these valves can become worn or damaged, affecting how well they seal. This can lead to a loss of power and efficiency.
A qualified mechanic will be able to tell you if your Corolla needs a valve adjustment. They will usually do this by looking at the engine's compression ratio. If it's low, it may indicate that the valves aren't sealing properly.
It's important to get any necessary valve adjustments done as soon as possible. Ignoring the problem could lead to more serious issues, like bent valves or damaged pistons.