Emission Control Systems: Service and Repair

EGR Control Solenoid Filter Replacement:

ELECTRONIC VACUUM REGULATOR VALVE FILTER REPLACEMENT


The EVRV filter should be replaced every 30,000 miles.

1. Grasp and pull filter "OFF" with a rocking motion.
2. Push new filter "ON", making sure cut-out for wires is properly aligned.


EGR INTAKE PASSAGE CLEANING


When cleaning 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 from being ingested into the engine.

1. Disconnect the vacuum hose from EGR valve and remove the valve.
2. Remove deposits from EGR ports by hand using suitable tools.
3. Brush small deposits down EGR port into passages, then using compressed air, blow ports clean. Solvents should not be used to clean EGR valve or passages, since damage to the system may result.
4. Install EGR valve, using new gasket


EGR VALVE CLEANING


CAUTION: Do Not wash any EGR valve in solvents or degreasers, as permanent damage may result. Also, sand blasting of the valve is not recommended, since this can affect the operation of the valve. Wear approved eye protection for this cleaning procedure, to avoid possible injury to the eyes.



Use the following cleaning instructions for EGR valves.


1. With a wire wheel, buff the exhaust deposits from the mounting surface and around the valve.

2. Look for exhaust deposits in the valve outlet. Remove deposit buildup with a screwdriver.

3. Clean mounting surfaces of intake manifold and valve assembly.

4. Install valve assembly using new gasket.


EVAPORTIVE CANISTER FILTER REPLACEMENT


Every 24 months or 30,000 miles, the filter on an open bottom canister should be replaced.


1. Remove all hoses from the top of the canister and mark. Remove the canister.

2. Remove the filter element by squeezing it out from under the lip surface at bottom of canister and from under retainer bar, where used.

3. Squeeze the new element under retainer bar, where used, and position it evenly around the entire bottom of the canister. Tuck the edges under the lip of canister.

4. Reinstall the canister to its original position on the vehicle, following normal service procedures.

5. Reconnect the hoses to the top of the canister, according to the labeling on top of canister.


PCV VALVE & FILTER REPLACEMENT


The PCV system should be checked every 15,000 miles and also during regular engine tune-ups. If the PCV system includes a breather filter, located in the air cleaner housing, this filter should be replaced whenever the PCV valve or air cleaner element is replaced. When a periodic inspection indicates the PCV is not functioning properly, it should be serviced by replacement only.