Operation CHARM: Car repair manuals for everyone.
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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Checking the EGR System

Tests 1 - 4:




Tests 5 - 10:




Test 11:




SYMPTOM
CHECKING EGR SYSTEM

POSSIBLE CAUSES
- Vacuum line to EGR solenoid restriction or leak
- Vacuum nipple at throttle body plugged
- EGR valve assembly defective
- EGR valve assembly does not hold vacuum
- EGR valve assembly tone changed
- EGR valve assembly vacuum <= 3 inches
- Passages between EGR valve and intake closed