Hard starts occur in your Chevrolet's motor when the fuel mixture in the vehicle is too high and the initial explosion generated by the firing of the engine is larger than it needs to be. In some extreme cases, hard starting can damage a vehicle's engine in the form of an explosion. Backfiring is commonly caused by hard starting.
Spark plugs are responsible for providing the actual spark that lights the fuel mixture in your vehicle and allows the engine to start and run efficiently. Spark plugs that are fouled by carbon or age can cause your Chevrolet to experience a hard start due to improper firing or multiple firing attempts.
Newer model vehicles are largely controlled by electronic systems and sensors. If a sensor is sending incorrect information to the powertrain control module, it can lead to a variety of starting problems, including hard starting caused by an improper fuel mixture or flawed delivery. This includes possible problems with your vehicle's fuel pump relay, which can cause fuel mixture and delivery issues, including too much fuel, to cause a hard start.
The ignition module controls the way the ignition coils fire following your turning the key. If the ignition module does not allow the vehicle to generate enough of a spark to ignite, then it will have to try again and a hard start will probably occur due to built up fuel-mixture and gases.
