Caution: Avoid breathing fumes and swallowing EGR exhaust deposits when removing
components for cleaning as bodily injury may result.
Whenever the EGR valve is removed, the EGR system should
be inspected and cleaned if necessary. This will ensure that the EGR system
will function properly during all operating conditions. Proper EGR system
service consists of the following 5 steps:
- EGR system diagnosis--Diagnosis of the EGR system should
be performed if PCM DTCs are set . Refer to
Diagnostic Trouble Code (DTC) List
.
- EGR valve pipe cleaning and checking for leaks--Clean and
check the EGR pipe from the exhaust manifold to the EGR valve and the EGR
pipe from the water pump crossover to the throttle body spacer. Refer
to
Exhaust Gas Recirculation Pipe Replacement
.
- EGR valve cleaning--If the EGR system is operating correctly,
the EGR valve can be removed, checked for deposits, cleaned, and re-installed.
Use the procedure below for this operation:
3.2. | While holding the EGR valve in your hand, use a pencil eraser
or other suitable soft instrument to depress the pintle several times. The
pintle should move in and out smoothly. Replace any valve that exhibits
tendencies to stick. |
3.3. | While holding the EGR valve base in your hand, try to rotate
the connector housing. Repeat this procedure for the coil housing. Replace
any valve that exhibits looseness. |
3.4. | Inspect the EGR valve pintle and the valve seat for deposits.
Use a cloth or other suitable soft device in order to remove the deposits.
Remove all loose particles. If the deposits are such that pintle/base
interface cannot be cleaned adequately to allow the pintle to seal against
the seat, replace the valve. Damage to the powdered metal EGR valve
base will occur if the valve base is cleaned with solvents, sharp tools,
a wire brush or wheel, or by sand blasting. Cleaning by these methods
is not recommended. |
3.5. | Inspect the passage in the water crossover assembly for deposits.
Remove all loose particles. |
- Cleaning the EGR passages
in the water crossover assembly.
4.2. | Remove the 2 plugs (2) and clean the passages with a wire
brush. Remove all loose particles. |
- Wash your hands with soap and water after any contact with deposits
from the EGR system.