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To put it simply, the timing mark on your car refers to when your engine creates an ignition spark relative to the pistons’ movements. Generally, they are found on older vehicles with four-stroke engine; newer ones use crank sensors. Timing marks will need to be adjusted from time to time so that your engine’s sparks fire off at the optimal time, ensuring the best possible performance.
Incorrect ignition timing can affect everything from accurate acceleration to proper fuel consumption, but engine timing is not routinely checked during scheduled maintenance. If you are experiencing the symptoms above, have your car inspected and your timing mark adjuster replaced if it's found to be faulty.
When you consider how important spark plugs are to your car's operation—firing over and over to keep your car moving—the timing behind this ignition system is extremely important. Don't delay getting your timing mark adjuster replaced if it's deemed faulty following a professional diagnosis.