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)

Or, hide this message: temporarily or permanently

Idle Speed

Fig. 404 IDLE SPEED SCREW:





1. Connect a photoelectric RPM-meter (or use VOLVO MONOTESTER and adapter #9950)
2. Warm up engine and idle additional five minutes after thermostat has opened
3. Turn off air conditioner
4. Adjust idle speed with idle screw Fig. 404. to 830 ± 50 RPM
5. Seal idle screw and lock nut with paint after adjustment