A8 ASE Quiz 1

A technician is performing a cranking compression test on a 4 cylinder engine, cylinders 1-3 have 130 psi of compression. Cylinder no.4 only has 60 psi of compression, so he injects oil into that cylinder and repeats the test. He now sees 125 psi of compression on cylinder 4, what is most likely wrong with this cylinder?

• Worn piston compression rings.

• Faulty intake valve

• Faulty exhaust valve

• Leaking intake manifold

Blue smoke is seen coming from a car's tailpipe, what is fluid is most likely being burning in the engine?

• Coolant

• Oil

• Washer fluid

• Excessive fuel

When testing an engine's intake manifold vacuum, a technician sees a steady reading of 21 in.hg. on the gauge. What does this mean?

• Faulty intake valve

• Faulty exhaust valve

• Restriction in the exhaust system

• Normal reading

Engine detonation can be caused by any of the following EXCEPT..

• a lean air/fuel mixture

• retarded ignition timing

• excess carbon in the combustion chamber

• a stuck-closed EGR valve

A regular customer brings his vehicle in for service. He describes the poor driveabilty and says the vehicle has been repaired here for the same problem in the past. What should you do first?

• connect the vehicle to an engine analyzer

• check for DTC's

• check the vehicle service history, TSB's, and recalls

• perform a cylinder power balance test

Two technicians are listening to a tapping noise coming from the top of a v8 engine. Tech A says it could be valves out of adjustment. Tech B says it could be a leaking exhaust manifold. Who is correct?

• Tech A

• Tech B

• Both

• Neither

A vehicle is towed in for a "crank no start" condition. What would be your first step in diagnosing this problem?

• Check for DTC's

• View the scan data

• Verify the concern

• Check the fluid levels

Technician A says that cylinder wear can be found using a cylinder leakage tester. Technician B says that a blown head gasket can be found using a cylinder leakage tester. Who is correct?

• Tech A

• Tech B

• Both

• Neither

When troubleshooting a slow drain on a battery, what tool should be used?

• ohmmeter

• ammeter

• voltmeter

• scan tool

A technician is performing a tune up on a coil on plug engine, and finds the coils have engine oil around the plug boot. What is most likely the cause?

• Leaking plug well seals

• Failed coils

• Worn piston rings

• Leaking spark plug gaskets