AUT 101 Engine Repair 1 Midterm

All the following are used to fully assess the mechanical condition of an engine, EXCEPT:

• a. a compression tester.

• b. a strobe light type balancer.

• c. a scan tool.

• d. a vacuum gauge.

A visual inspection of the engine assembly for leaks will affirm the ability of the _______ to contain each of the engine's fluids.

• a. Seals

• b. Gaskets

• c. Both A and B

• d. Neither A nor B

A _______ pumps air into the engine's cylinder and measures the percentage of air that is leaking from that cylinder.

• a. Compression tester

• b. Pressure transducer

• c. Cylinder leakage tester

• d. Data link connector (DLC)

The noises that you could hear during a cranking sound diagnosis include all of the following EXCEPT:

• a. The clunk of a spun crankshaft bearing noise.

• b. The engine revving and starting up.

• c. An uneven cranking sound that a low-compression cylinder gives.

• d. A fast cranking sound from a no-compression condition that is due to bent valves caused by a broken timing belt.

Technician A says that low compression on a single cylinder will cause an engine not to start. Technician B says that low compression on a single cylinder will affect the engine's cranking sound. Who is correct?

• a. Technician A

• b. Technician B

• c. Both A and B

• d. Neither A nor B

When performing a cranking sound diagnosis, Technician A says that all engines may be prevented from starting by holding the throttle wide open while cranking. Technician B says that an engine may be disabled by removing the fuel pump fuse or relay (if equipped). Who is correct?

• a. Technician A

• b. Technician B

• c. Both A and B

• d. Neither A nor B

Technician A says vacuum traces should be taken at idle, 1,200 rpm, and 2,500 rpm when using a pressure transducer. Technician B says vacuum testing should only be performed at idle speed. Who is correct?

• a. Technician A

• b. Technician B

• c. Both A and B

• d. Neither A nor B

When testing intake manifold vacuum, the gauge reads normal at idle, but reads very low when the engine is held steady at 2,500 rpm. Technician A says this indicates worn valve guides. Technician B says this indicates a restricted exhaust system. Who is correct?

• a. Technician A

• b. Technician B

• c. Both A and B

• d. Neither A nor B

When testing intake manifold vacuum, a low steady reading at idle is likely to be caused by:

• a. a burned exhaust valve.

• b. a partially restricted exhaust.

• c. late ignition timing or valve timing.

• d. None of the answers listed

If the engine has port fuel injectors that are accessible, disconnecting the electrical connector from each injector one at a time will shut off the fuel to that cylinder.

• True

• False