Q:

What are the signs of bad spark plugs?

A:

Quick Answer

There are a variety of signs of bad spark plugs including difficulty with starting an engine, a rough idle and an increased consumption of gas. Other signs include an engine that has a sudden surge when driving and difficulty with acceleration when applying the gas.

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Full Answer

Spark plugs work by igniting the gasoline in a car's engine to keep it moving. In order to avoid issues, spark plugs should be cleaned and checked regularly. If the plugs get bad enough, the car will fail to run and start at all. Fortunately, spark plugs can go for approximately 30,000 miles before they need to be replaced.

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Related Questions

  • Q:

    Why do spark plugs foul?

    A:

    Worn or damaged valve guides, worn or damaged piston rings, rich fuel mixture and a leaky head gasket can all be causes of spark plugs fouling. An improperly performing ignition system might also be a cause for spark plug fouling.

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  • Q:

    How do you clean spark plugs?

    A:

    To clean spark plugs, disconnect the cables, remove the spark plugs, scrub them with sandpaper and a wire brush, wipe them with solvent, reinsert them, and reattach the cables. This 45-minute process requires work gloves, a bench vise, sandpaper, a brush, a ratchet wrench, solvent and rags.

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  • Q:

    How do you gap spark plugs?

    A:

    Gap a sparkplug by cleaning the plug, selecting the correct wire gauge, testing the gap and adjusting the electrode. Check and adjust pregapped plugs from the factory due to potential changes that may occur in shipping.

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  • Q:

    How often should you change spark plugs?

    A:

    Spark plugs are replaced every 80,000 miles. Many vehicle manufactures claim their spark plugs can last up to 100,000 miles, but as the gap in the plugs widen, the chance of vehicle problems rises significantly. Some of these problems include bad gas mileage and reduced engine performance.

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