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Intake Valve

A valve that opens to admit the air/fuel mixture.

Person threading the guide of STP intake valve cleaner hose into the air intake duct

How to Use STP Pro-Series Intake Valve Cleaner

Clean out your intake path with STPs powerful intake valve cleaners. Learn step-by-step how it's done.

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Close up image of an engine with four fuel injectors running along the fuel rail

The Evolution Of Fuel Injection

Ever wonder about the history of fuel injection? Us too. Check out how cars moved from carburetors to electronic fuel injection.

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