Are you ready for a lesson on auto repair troubleshooting? Good. There are 3 things required to make an engine operate: air, fuel, and spark. These three things not only have to be present, but they have to be combined in just the right way at just the right time. If you have just 2 of them, you get to call a cab, hop on a bike, or take off walking.

Last Saturday the kids and I hopped into my car to go grab some PVC pipe from the hardware store, but my car wouldn’t start. It had given me some trouble the week before, but after a couple of attempts at starting it, it fired up. However, on Saturday, it was a different story.

While I knew the car was not out of fuel, my first thought was that fuel was not getting into the combustion chamber. The likely candidates would be the fuel filter, or the fuel pump. Since the fuel pump is located inside the gas tank on my car, replacing it would require removing the gas tank and mess of other things that are beyond my ability to do myself. So I decided to start with replacing the fuel filter. However, before I headed off to the auto parts store, I decided to give it one more chance to start. It didn’t start up, but I noticed something new.

Now as I tried to start it, I could smell fuel. This meant that I was wrong. Fuel was making it to the combustion chamber, so one of the other two ingredients must have been missing. It seemed very unlikely that it was an issue of getting air into the motor or that the motor was losing compression. It was more likely an issue of not getting spark.

Now it was about this time that my son had decided that he wanted to watch me work on the car. As is the case with most 9 year olds, he’s very inquisitive. He wanted to know what was wrong and how I was able to figure it out. I told him all the stuff I just told you. Since he was just in time to help me troubleshoot the electrical system, I let him help me out. Read More...

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