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 needed. This will insure that the EGR system
will function properly under all operating conditions. Proper EGR system
service consists of the following five steps:
- EGR system diagnosis. Diagnosis of the EGR system should be performed
if PCM DTCs are set .
- EGR valve pipe cleaning and inspecting for leaks. Clean and inspect
the EGR pipe from the exhaust manifold to the EGR valve. Refer to
Exhaust Gas Recirculation Pipe Replacement
.
- EGR valve cleaning. If the EGR system is operating correctly,
the EGR valve can be removed, inspeccted for deposits, cleaned, and re-installed.
Use the procedure below for this operation.
| 3.2. | While holding the EGR valve base in your hand, try to rotate
the connector housing. Replace if the valve that exhibits looseness. |
| 3.3. | Inspect the EGR valve pintle and seat for deposits. Use a cloth
or other suitable soft device to remove deposits. Remove all loose particles.
If deposits are such that pintle/base interface can't be cleaned adequately
to allow the pintle to seal against the seat, replace the valve. Damage
to the EGR valve base will occur if cleaned with solvents, sharp tools,
wire brush/wheel or sand blasting. Cleaning by these methods is not recommended. |
