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

CURB IDLE SPEED
California 850 rpm
Federal, High Altitude 800 rpm

FAST IDLE SPEED
Federal 1300 rpm
California, High Altitude 950 rpm

Fig. 8 Fast idle speed adjustment tool installation. 4-156 engines:




NOTE: With tool C-4812 installed.