A faulty fuel injector will cause the corresponding cylinder to not be able to fire. This means that while driving, the engine will vibrate or hiccup after it tries to finish each cycle without fuel.

The most obvious sign of a problem is when the “Check Engine” light illuminates on your dashboard. Although this could mean a lot of things, a bad fuel injector could be one of them.

If the fuel injector is spraying too much fuel into the engine cylinder, this will create a surge in the engine causing your acceleration to be much slower. When you drive, you’ll notice that the engine RPM will change noticeable under constant load rather than remaining at a constant RPM.