Injectors, Quick Check

F1 Audible Check
- Start engine.
- Listen to injectors.
A clicking sound should be heard if valves are operating properly.





- Hold a screwdriver against injector to amplify sound.

F2 If No Click Is Heard:
- Interchange connector with one that operates properly.

If fault is transferred to the "known-good" injector, this shows that fault lies with wiring.

If original injector still does not function, it is probably defective.





- Measure injector resistance.
Resistance should be 16 ohms at 20°C (68°F).
Resistance increases as temperature rises.

F3 If A Click Is Heard But Engine Is Rough:
- Let engine run at idle.





- Disconnect/connect wire from injectors one at a time.

If engine speed drops considerably when wire is disconnected, injector is probably in full working order.