To replace the wires, ensure you have the correct wire size or length for the appropriate plug.If you're not replacing the spark plug wires, you'd simply push them into the relevant well until it clicks into place.Hand-tightening each plug is ideal, using a torque wrench for the last bit. Use the socket to install and tighten the new plugs - be careful of over-torquing.Check the plug gap on new spark plugs (see below) before installing them.It's a good idea to inspect the old plug and compare the new plugs to ensure they are the correct size. You should be able to screw the plug out by hand once it's broken loose and remove it.Using a spark plug socket (connected to an extension, where needed) and a ratchet, push down onto the plug and break it loose.Clear out the spark plug well with more compressed air once the boot has been pulled out. Avoid pulling on the wires, and make sure to lift from the boot. Remove the spark plug wires, being careful not to damage the rubber boot or the wires themselves.Clean any dirt from around the area you'll be working in - compressed air does a great job here.To be on the safe side, you could disconnect the battery by following these steps. Here are the steps to follow when you're changing out a spark plug: Some engines may require more specialized tools such as a universal joint extension.The tools needed to change spark plugs generally include: Once you've established what the problem is, you'll want to know how to change spark plugs and the wires associated with the system. Performing an emissions test will show that there is a lot more gasoline vapor than there should be. Since some of the fuel isn't being ignited in the engine, it makes its way into the exhaust system, where it evaporates and creates a strong odor. The latter part of this problem is eminently noticeable. Poor emissions test results and exhaust fumes smell like gas.You'd need to be the type of person that pays close attention to your driving and regassing, but you will notice a decrease in efficiency since at least some of the fuel isn't being ignited and burned properly. Fuel efficiency: A slightly less obvious sign that a spark plug is bad would be if your overall fuel economy takes a hit.When it's pumping but not actually getting anything done, it can rattle loudly. Rough idling and loud engine noises: When a spark plug isn't working, the corresponding cylinder on the engine fails to function properly, too.This is a telltale sign of spark plug failure. Weakening engine performance: A knock-on effect of misfires, acceleration and overall performance will suffer if any of the cylinders fail to ignite its fuel mixture.You may even hear a popping sound or notice that the engine suddenly loses power for a second before catching again. However, a faulty spark plug can certainly cause a misfire. The engine misfires: Since there are multiple possible causes for a misfire, this is a less clear-cut symptom.Sometimes the spark plugs themselves are the issue, being worn down or clogged and not able to produce that essential spark. Ignition coils provide the charge for the spark plugs, and when an ignition coil fails, the spark plug won't be able to start the combustion process. The car struggles to start: This is a very obvious sign.To help you avoid this, here are the symptoms of a bad spark plug to keep an eye out for: It can also negatively affect things like fuel economy or even damage your engine, leading to far more expensive repairs. A faulty spark plug can have a serious impact on the running of your vehicle, and it may even lead to decreased performance.
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