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Summary: If a spark plug of the wrong size is installed, the car will misfire. Check spark plug sizes with auto repair tips in this free video on car maintenance.
John Clarkson is a jack of all trades and has worked as an electrician and mechanic.read more
"Hi, my name is John, from ExpertVillage.com, and we're replacing our spark plugs, in our Nissan Sentra here, and one thing you need to do, is get your new spark plug. Now, we have all the tools, in our new spark plug. Now this, it's very important that the distance from here to there, is exactly how you need it to be. It's got to be able to fire right. It's all just about how your car is made, so make sure it's the right one, so let's check it. This is supposed to be a Nite here, so that's exactly what we want. You don't want to be able to force it, but it needs to be snug, so when we take our spark plug out, let's compare it to see, because if we put in the wrong size, it will misfire. It won't fire right. You lose power. You lose gas mileage efficiency, so what we're going to do now, is remove the spark plug wire, make sure we have everything. Also, I use this if the spark plug doesn't come out, or I can't remove it. I just get this little thing, and pull it out."
eHow Article: Checking Spark Plug Sizes