Exam 24: Fuel-Injection System Diagnosis and Service

What should be done if the fuel pressure regulator will NOT hold vacuum?

Fuel injectors can be tested using ________.

Technician A says that if fuel pump pressure is correct, fuel pump volume will be correct as well. Technician B says that a fuel pump may produce specified pressure but below specified volume. Which technician is correct?

Which of the following could be a reason for poor cold engine performance?

On a vehicle with a mass airflow injection system, which of the following is likely to occur with a vacuum leak at idle?

An injection cleaning machine is being discussed. Technician A says that the applied pressure should be between 75-90 PSI before starting the engine. Technician B says to pressure clean the fuel system using a 2:1 mixture of solvent to gasoline. Which technician is correct?

All of these are types of injector circuits EXCEPT ________.

Which of these tools is best to check whether the PCM is pulsing an injector?

Technician A says that a noid light can help when checking the fuel system in a no-start condition. Technician B says that the ignition system trigger device is used to synchronize fuel injection. Which technician is correct?

Which term describes the electrical current flow in the opposite direction when an injector coil is energized?

When looking at an injector voltage with an oscilloscope, what event often follows removing power from the coil windings?

During a fuel pressure test the technician notices that the system does not hold pressure for more than 10 minutes with the engine off. What could be the cause?

What could be the problem if a noid light remains on (does not flash) with the engine cranking?

How much voltage is generally available to fuel injectors?

Technician A always uses a special service tool to pulse fuel injectors. Technician B says that the injector for each cylinder should only be flow tested four times without starting the engine. Which technician is correct?

During a fuel injector pressure drop test, the difference between any two fuel injectors should not exceed?

The following statements are all correct EXCEPT ________.

Technician A says that all the fuel injectors on an engine should have the same electrical resistance. Technician B says that the difference between any two injectors should be less than 2 ohms. Which technician is correct?