![]() ![]() Now start the engine.ĭoes the fuel pressure drop almost immediately? Does it go all the way to zero? If it drops all the way to 0 and doesn’t come back, it’s most likely the fuel pump relay. Take note of the fuel pressure as you turn the key to the on position. But, most engine’s have a port that will allow you to check the fuel pressure with a gauge that you can rent or buy from a store such as Autozone. The fuel pump may be providing enough fuel pressure when starting the engine, but not providing enough to keep it running. There are a few reasons that you may not have enough fuel pressure. When they don’t have the proper pressure, they can’t run properly. Modern fuel injected engines need a lot of fuel pressure to keep running. Here are some of the most common reasons that your Cobalt starts then stops running: We recommend looking to see if there are any OBD2 codes before proceeding with any manual diagnosis. Modern vehicles have complex computer systems that can tell you the reason that the vehicle is dying immediately after starting it. This is one of the most common reasons why a car starts and then dies. If there is not enough fuel pressure to meet the needs of the vehicle, the engine will shut down. As soon as the engine gets enough fuel, air, and spark it runs on its own.Īt this point the starter is disengaged and the vehicle will need a constant supply of gasoline. Once you hit the starter it turns the engine slowly. When you turn the key to the on position, all three of these system engage and are ready for you to start your Cobalt. If you vehicle starts up, but then immediately quits, it may be getting all three at first, but something is clearly keeping it from getting all three consistently. Your Cobalt’s engine needs 3 things constantly and in the proper proportion to keep running. It is most likely caused by some type of issue with the electrical or fuel system. It can be very disconcerting if your Chevy Cobalt is starting and then dies.
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