Fuel injector cleaners remove dirt and residue to improve engine performance and efficiency. Learn how they work and choose the best one for your car.

Taking your car to a mechanic for fuel injector cleaning will involve removing the injectors from the engine and performing the service on a bench with special machinery.

We explain why all gasoline engines, especially direct-injected engines, benefit from routine intake manifold, valve, and injector cleaning.

Fuel injection requires virtually no maintenance regardless of all those TV commercials pushing cleaners; the rotating valve pistons are self-cleaning during the injection process.

This is noteworthy because some bottled fuel-injector cleaners may only be aimed at cleaning fuel-injector nozzles, while others may claim to also clean intake valves and combustion-chamber deposits.

Modern engines are more advanced and more demanding, which is why fuel chemistry is a critical factor when it comes to ...