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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Exhaust Gas Recirculation: Testing and Inspection

1. Run engine until it reaches operating temperature.
2. Check vacuum pipes and hoses for leaks.
3. Gradually increase engine speed and observe EGR valve diaphragm.
4. EGR valve should begin to open at approximately 1900 RPM.
5. If valve fails to open, disconnect vacuum hose from PVS valve at EGR valve.
6. Using a suitable hand held vacuum pump, apply vacuum directly to EGR valve.
7. If engine runs rough, EGR valve is operating properly.