Automotive

If you're having difficulty starting your car or it's running rougher than it used to, it may be time to replace the spark plugs. Spark plugs are generally very reliable engine components-which is perhaps why we often neglect them. However, leaving spark plugs in too long or poor plug installation can cause lost fuel mileage, rough operation and engine damage.

Replace spark plugs according to the manufacturer's recommendations. There are now a number of high-quality, longer-lasting plugs available such as Autolite® Platinum, which last up to three years, and Autolite® Platinum Pro, which last up to five years. This means you can change your plugs less often while maintaining a high level of engine performance. The automotive experts at AlliedSignal provide the following tips for proper spark plug installation:

Before You Begin: First, always check the plug's "gap," or the clearance between the electrodes at the firing end of the plug. While the spark plug gap is set during manufacturing, it may need some adjustment after shipping and handling. Make sure the gap is properly set for your specific vehicle engine. It's a good idea to clean out the area first by blowing into it. That way, you'll prevent bits of dust and grit from falling into the cylinder.

Removing Spark Plugs: You'll need to use a spark plug wrench. Apply firm, steady pressure on the wrench until it starts to budge. Then, after each full turn of the wrench, actually screw the plug back in, just a touch, to loosen any debris that may be caught on the threads.

If You Can't Loosen the Plug: Try running the engine until it's warm, as this tends to expand the plug hole. Turn off the engine and try removing the plug. Or, you might want to try spraying penetrating oil at the base of the plug. However, make sure the engine is cold before spraying the oil. Allow the oil to soak in for a while to lubricate the threads before putting the wrench on the plug.

After removing the old plug, have a look to make sure that the threads in the engine are not damaged. For repairing minor thread damage, you can try using a thread chaser. But, make sure you follow the manufacturer's directions carefully.

Installing the New Plug: Start the new plug off by hand to make sure you don't thread it in crooked. And be sure you don't over-tighten the plug. Gasket-seat plugs shouldn't be screwed in more than 1/12th turn past where they contact the engine and tapered-seat plugs shouldn't be more than 1/16th of a turn.

If done properly, replacing your spark plugs won't be a difficult or time-consuming task. And, getting into the habit of replacing them regularly may help you avoid significant engine damage in the future.

Leaving your spark plugs in too long can cause lost fuel mileage, rough operation and engine damage.

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