Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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EGR Valve: Testing and Inspection

1. Depress the diaphragm with finger to see that it operates smoothly through the full stroke.
2. Make a test with the engine running at idle to see that the engine idling becomes rough when the EGR valve is forced open.

NOTE:
- Leakage in the EGR valve causes rough engine idling. To check EGR valve for leakage, disconnect EGR valve piping at exhaust manifold side and see if engine idling becomes smooth.