EGR System Cleaning

EGR Control Valve Cleaning

CAUTION: Do not wash EGR valve in solvent or degreaser, as permanent damage may result, also, sand blasting of the valve is not recommended, since this can affect the operation of the valve.

WARNING: To avoid possible injury to the eyes, wear approved eye protection for this cleaning procedure.

Clean the control valve and passages as follows:

1. Disconnect vacuum hose from EGR valve, then remove EGR valve-to-manifold retaining bolts, and the control valve.
2. With a wire wheel, remove any deposits from the mounting surface and around the valve.
3. Open the control valve, with an external vacuum source, and check for excessive carbon deposits, (anything more than a thin film is excessive).
4. Scrape the carbon deposits from the control valve poppet, being careful not to scratch the valve seat, or dislodge the poppet from its stem.
5. Check the poppet valve and stem for wear, if it is worn the control valve must be replaced.

Note: When cleaning EGR valve and intake manifold EGR passages, care should be taken to ensure that all loose particles are completely removed to prevent them from clogging the EGR valve or being ingested into the engine.

6. Using a wire wheel remove all deposits from valve mounting surfaces.
7. Blow deposits from EGR ports and control passages using compressed air.

Caution: Do not use drills or wires to clean control passages as calibration may be altered and result in poor engine performance.

8. Install the EGR control valve with a new gasket.
9. Connect EGR vacuum hose