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 Preheating Shutter





Checking Preheating Shutter
- Engine idling.
- Place a hand on the preheating hose where it is connected to the air cleaner (ACL) housing.
- The temperature of the hose should be the same as ambient temperature.

If reading is OK:
^ Proceed to: Checking Mass Air Flow Sensor.

If reading is incorrect:
^ Check preheating shutter in air cleaner housing for leakage.