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

Controlled Idle Speed

CAUTION: Some models are equipped with a factory adjusted throttle plate position set screw. Never attempt to adjust idle speed using this screw, unless directed to do so in a service procedure. Idle speed is electronically controlled by the Powertrain Control Module (PCM) through the Idle Air Control (IAC) motor, and is not adjustable.