When you open the hood or bonnet of your car, you should see a bundle of 4-8 wires leading to different points on the engine compartment. The spark plugs are located at the engine end of these wires, under the plug covers that attach them.  On a 4-cylinder engine, spark plugs will be located on the top or side of the engine in a row. On an inline 6-cylinder, they are located on the top or side of the engine head. On V6 and V8-cylinder engines, plugs should be separated evenly on each side of the engine. Some cars have engine covers you'll have to remove to see the spark plug wires, tracing them back to find the plugs themselves. You should always check your owner's manual and look up where your spark plugs are, how many you have, the correct "gap" and the size socket needed to remove them. You should also number the corresponding leads to the cylinder so as not to confuse which lead goes where when replacing with new plugs.  At this point, it is good practice to inspect the leads for any damage or cracks as replacement leads may also be required. If you've been running the car for a while, the plugs and the entire engine and exhaust system manifold can get extremely hot. Only remove them when the engine is cool enough to touch. In the mean time, assemble your tools while you wait for your engine to cool. To change your spark plugs, you'll need:  A ratchet socket drive wrench An extension bar Spark plug socket, usually included in most ratchet socket sets A spark gap gauge or feeler gauge, available at any auto parts store This number should be a specific measurement anywhere between .028-.060 inch, with a bit of wiggle room depending on your particular set of plugs and your car. These days, most plugs come preset according to the model number of the plug and their application, but it is wise to double check. Refer to your owner's manual to find out the optimum distance for your spark plug gap and use a gap checker or feeler gauge to check the distance.  If the distance of the spark plug gap is higher than it should be, but the plug is still of a relatively high quality and is an adjustable-gap plug, you can either try to change the gap by gently tapping the plug on a wooden surface with the gauge in between the plug gap until the desired measure is set at the correct measurement, or you can simply buy new plugs. It's usually recommended that you replace the plugs after every 20,000 Km or 12,000 miles or as indicated in your vehicle owners manual. Spark plugs are not overly expensive, and it's a good idea to replace them at regular intervals for trouble free motoring and a proper spark.  If you're going to start changing your own plugs, invest in proper tools and equipment, such as a fine gap checker. It's basically a metal ring you can use to see if the electrodes are close enough to fire properly. Feeler gauges are even more precise and give a wider range of applications. The same goes for parts: aways buy quality and or genuine parts, it is worth a few dollars more for peace of mind and reliability.
حدد مكان شمعات الاحتراق في سيارتك (راجع دليل المستخدم). دع المحرك يبرد قبل نزع الشمعات. قم بقياس الخلوص الخاص بشمعة الاحتراق.