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

Excessive Engine RPM


1. Stuck air bypass valve in fast idle mechanism.
2. Throttle valve stuck open.
3. Open or shorted manifold air pressure sensor circuit.
4. Broken or disconnected manifold air pressure sensor hose.
5. Defective manifold air pressure sensor.
6. Defective EGR control system.