After a cool weekend, you have an early start on Monday. You get ready and head to your car but see that the engine has turned over. These are the symptoms associated with fuel injectors. To identify the symptom you need a diagnostic scanner but once you have identified that it is necessary to find the solution. The cause is usually a dirty fuel injector. So, what should be your next step? An injector cleaner is an electronically controlled valve which either opens or closes completely.