spark plug

 

If your spark plugs are fouled and misfiring because you have been driving your vehicle infrequently, or you have only been driving short distances (only a few miles per trip), or you have been letting your engine idle for long periods of time (15 minutes or more), try this: Take your vehicle out on the highway, accelerate quickly and drive it at highway speeds for 15 to 20 minutes. This should clean the plugs if the cause of the fouling is nothing unusual.

If the spark plugs continue to misfire because of fouling, they may be dirty or worn. Remove and inspect the spark plugs, and either clean or replace them as needed. Auto Parts stores sell spark plug cleaner devices that sand blast the end of the spark plug to remove deposits. If you use one of these devices,make sure no sand remains trapped between the spark plug electrode and shell before they go back in your engine. Also, be sure to regap the spark plug electrode gap back to specifications (which requires a spark plug gapping tool or feeler gauge). The recommended gap is usually specified on an underhood emissions decal in the engine compartment

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