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A four-cylinder engine has four spark plugs. An important part of the power-generating process, each spark plug is responsible for igniting the fuel and air mixture inside of its cylinder. At the beginning of a stroke, a piston moves downward in its cylinder, drawing in a precise mixture of gas and air. After reaching the bottom, the piston moves back up, heavily compressing the mixture. Once it reaches the top, the spark plug ignites the mixture, and the explosion forces the piston down into the cylinder. This mechanical movement is harnessed and used to power the vehicle. Some large engines may have two spark plugs per cylinder to ensure that complete combustion is achieved and maximum power is generated.
try filling it and see how much it takes to fill. this should tell you if the guage is faulty or if it really is burning too much. didn't meat loaf have a song? 2 out of 3 an't bad?
Possibly piston rings. get a compression test or if it has a crank handle, crank it by hand to see if there are four compressions there. You should be able to feel the difference between the cylinders.
first of all you say you took out the plug you may have to replace the boot on the #2 spark plug and where you said it is fill with gas look at all of you injectors on that side and the fuel rail to make sure nothing is leaking at all use a flashlight when trying to find the leak cause its safer that way.
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