How can you tell if a diesel injector is bad?

Here are the 5 most common symptoms of faulty diesel fuel injectors.

1. Trouble starting the vehicle or uneven idling. The engine cranks but doesn’t start unless you crank it for a long time.
2. Misfire.
3. Smell of fuel.
4. Dirty emissions.
5. Increased fuel consumption and poor miles per gallon.

How do you diagnose a bad injector?

Here are a few signs there might be something wrong with your fuel injectors.

1. The Engine Misfires. Dirty fuel injectors may cause your vehicle’s engine to misfire.
2. Idling Gets Rough.
3. Your Gas Mileage Tanks.
4. The RPM Needle Starts to Dance.
5. Your Car Won’t Start.

Is it bad to run a diesel with a bad injector?

Left too long, a faulty fuel injector can cause serious engine damage that requires major repair. The first trouble will be difficult starting or long starting. Diesel engines are work horses of the industry and usually keep running till they abruptly stop and when this happens the repair costs are usually prohibitive.

How do I test an injector with a multimeter?

Fuel Injector Resistance Testing

1. Turn the multimeter to “Ohms.”
2. Place the multimeter leads into the fuel injector plug terminal.
3. Read the Ohms, or resistance, produced by the fuel injector.
4. Test all the fuel injector Ohm readings.
5. Replace the injector if the Ohm value is significantly different than other injectors.

Can you drive a diesel with a bad injector?

Yes. It’s not the best idea, but you can. It’s basically the same as driving a gasoline engine with a bad spark plug. That cylinder will be dead.

Can a fuel injector be stuck open?

An injector that is stuck open or partially closed will emit an unburnt fuel odor in the engine compartment. A dead injector will cause the engine start and operate when it is cold but not when it is warm.