How to Diagnose Car Problems When It’s Not Starting

Why a vehicle won’t start can be a complicated question, but in many cases, we have to start our diagnosis with some of the basics. There are basically two things that we look for first and that is, does the vehicle have spark and does it have fuel? Those are the two most common reasons why of the vehicle doesn’t start. In this vehicle here, we’re going to do our preliminary checks to determine if that’s one of the reasons why it doesn’t start. The first thing we’re gonna do is we’re going to hook up a fuel pressure gauge to the Schrader valve, a test port on the fuel rail. That way when we turn the ignition on, we’ll be able to tell if the vehicle actually has fuel pop operation. Of course, that’s always very important when dealing with gasoline (be careful not to spill the gasoline).

Keep a fire extinguisher close at hand for safety purposes. The next thing we’re going to do is we need to determine whether or not the computer is sending signals for the vehicle to inject. I’ve disconnected one of the wires from one of the six fuel injectors on this car. I’m inserting a little test light so this way when we crank it over, we should get some indication as to whether or not that signal is being sent. Lastly, we need to know if the vehicle has spark. What we’re going to do is disconnect one of the spark plug wires from a spark plug and install a spark tester and see whether or not it has sparked. Now what we’re going to do is we’re going to crank the tester over and see which one of these things that we have. We’ll just turn the key on and see what happens.

We turned the key on and it came up to 40 PSI, which indicates that the fuel pump works. The next thing we’re gonna do is we’re going to check and see whether or not the Lloyd light blanks and that’ll give us some indication of whether we have signal coming from the computer to turn the injectors on and off. That indicates that we’re good in a good signal from our computer.

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