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

Fuel Injector Check


1. If engine can be operated, start engine. With engine running, disconnect and connect each injector wire connector. As each connector is disconnected, engine speed should drop.
2. If engine cannot be started, turn ignition On. Disconnect each injector wire harness connector. With suitable voltmeter connected to ground, check for battery voltage at one or both injector connector terminals.
3. Using suitable ohmmeter, check resistance across injector terminals. Resistance should be 2 - 3 ohms at 75° F.