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

Rough Idle


1. Cold start injector seal leak.
2. Auxiliary air regulator not closing.
3. Leak in air intake system.
4. Defective injectors.
5. Low fuel pressure.
6. Throttle plate not closing.
7. Open or short circuit in harness wiring.
8. Defective throttle position switch.
9. Defective control unit.