Diesel Intake Throttle Valve
A diesel intake throttle valve controls air flow into a diesel engine to support EGR, DPF regeneration and smooth shutdown.
What is Diesel Intake Throttle Valve?
Diesels do not need a throttle to control power, unlike petrol engines. Partly closing the valve creates the pressure difference needed for EGR flow. It closes fully when the engine is switched off to stop shaking and run-on. Cleaning can help, but heavily coked valves are usually replaced together with a check of the EGR system.
How it works
An electric motor positions the flap according to commands from the engine control unit, with a sensor reporting its angle.
Why it matters for your car
Carbon deposits from EGR and crankcase gases can make the flap stick. Faults can cause limp mode, failed regeneration or a rough shutdown.
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