1.

  An EGR valves vacuum solenoid has 18 Hg as its vacuum source. The resistance checks out OK. Vacuum pressure is manually applied to the diaphragm with a pump and a slight stumble is noticed with little drop in RPM. The most-likely cause of this is:

A A faulty vacuum solenoid.

B Poor vacuum source.

C A restriction in the EGR passage.

D The EGR position sensor.

6.   

After performing a cylinder compression test the results shown in the image stay the same after oil has been injected into the cylinders. Which of these is most-likely the cause?

A Worn piston rings.

B Low Manifold vacuum

C Burned exhaust valves.

D Retarded camshaft timing.

2.   A cylinder power balance test is being performed on a vehicle with sequential fuel infection. Two adjacent cylinders are under performing. Technician A says this could be due to a restriction in the fuel injectors. Technician B says this could be due to leaking secondary insulation. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

7.   A vacuum gauge is connected to the intake manifold of an engine. The needle fluctuates between (15 and 20 in Hg) at idle. This reading indicates:

A A normal condition.

B Late ignition or valve timing.

C A burned exhaust valve.

D A restricted exhaust.

3.   A COP ignition system has no spark coming from any of the coils. Which of these is most likely the cause?

A A faulty PCM driver.

B Excess resistance in the primary circuit.

C Excess resistance in the secondary circuit.

D No power to PCM BAT+.

8.   Technician A says a stuck closed EGR (exhaust gas recirculating) valve will cause an engine to stumble or stall. Technician B says a stuck open EGR valve will cause detonation. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

4.   Technician A says the MAF sensor is located on the intake manifold and informs the ECM of intake manifold pressure. Technician B says the MAF sensor senses air volume in the air tube. It's signal indicates engine load to the ECM. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

9.   A vehicle is emitting black smoke from its tailpipe at idle. The most likely cause of this condition is:

A A leaking fuel injector.

B Worn piston rings.

C A blown head gasket.

D Leaking valve seals.

5.   Technician A says a throttle position sensor is considered a potentiometer. Technician B says this sensor can be tested with an ohmmeter. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

10.   A vehicle has a lack of power while accelerating. A vacuum gauge reads 10Hg at 2500 RPM. The most-likey cause of this reading is:

A Burned exhaust valve.

B Late valve timing.

C A faulty head gasket.

D A clogged catalytic converter.