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

Poor Fuel Economy


1. Abnormal choke valve operation.
2. High engine idle speed.
3. Malfunctioning engine choke.
4. Enrichment valve stuck open.
5. Malfunctioning engine coolant temperature sensor.
6. Malfunctioning oxygen sensor.
7. Malfunctioning timing control system.
8. Malfunctioning feedback solenoid valve.
9. Malfunctioning slow cut solenoid valve.
10. Malfunctioning throttle position sensor.
11. Malfunctioning engine speed sensor.
12. Broken, short circuited or incorrectly connected harness connector.