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)
Or, hide this message:
temporarily or
permanently
High Temperature Vacuum Signal Modulator
This unit is located at the rear of the engine compartment and is connected to the
EGR vacuum signal hose. The modulator opens when the underhood air temperature reaches 115° F and causes a weakened vacuum signal to the
EGR valve. As a result, the amount of exhaust gas being recirculated is decreased.