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

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Computers and Control Systems

Idle Speed Specifications:





Engines w/DIS: Radiator fan (and all other electrical items) must not run while adjusting idle speed. Disconnect harness plugs from the idle stabilizer and connect them together.


Engines w/o DIS: disconnect PCV valve hose from valve cover and disconnect plug at green oxygen sensor wire. Start engine and check idle speed.