ASE A1 - Practice Test (Section A)
comprehensive Questions and Answers
with Verified Solutions
Question 1:
1. an engine miss is being diagnosed using a cylinder leakage test.
Technician A says that any cylinder with over 20% leakage has excessive
leakage. Tech B says that air leaking from the tailpipe indicates a cracked
cylinder. A only B only Both A & B Neither A nor B
Answer:
A only If cylinder leakage exceeds 20%, check for air escaping the
tailpipe, the PCV valve opening in the rocker arm cover, and the top of
the throttle body or carburetor. Air leaking from the tailpipe usually
indicates an exhaust valve leak
Question 2:
23. during a compression test, a cylinder has 40% of the specified
compression reading. When the tech performs a wet test, the
compression reading on this cylinder has 75% of the specified reading.
The cause of the low compression reading could be worn piston rings a
burned exhaust valve a bent intake valve a worn camshaft lobe
Answer:
worn piston rings if compression increases during a wet test, this
indicates worn piston rings. Compression would not increase if an
exhaust valve is burned, intake valve is bent, or camshaft lobe is worn.
, Question 3:
35. the customer complains that the engine cranks but does not start; the
first thing to check should be valve train operation battery voltage
Answer:
valve train operation if the engine cranks properly, the battery is not the
problem. Compression would not be the FIRST test, and because engine
vacuum is low during a crank, a vacuum test would not be conclusive.
Question 4:
40. during a cylinder balance test on an engine with fuel injection, one
cylinder provides very little rpm drop. Tech A says the ignition system
may be misfiring on that cylinder. Tech B says the engine may have an
intake manifold vacuum leak. A only B only Both A & B Neither A nor B
Answer:
Both A&B Both a misfiring ignition system and an intake manifold leak
could cause a cylinder to contribute too little power
Question 5:
54. while discussing basic diagnostic procedures, Tech A says the most
complicated diagnostic tests should be performed first. Tech B says that
you should first question the customer to obtain as much info as possible
about the problem A B A & B Neither
Answer:
B Always attempt the more simple diagnosis first
comprehensive Questions and Answers
with Verified Solutions
Question 1:
1. an engine miss is being diagnosed using a cylinder leakage test.
Technician A says that any cylinder with over 20% leakage has excessive
leakage. Tech B says that air leaking from the tailpipe indicates a cracked
cylinder. A only B only Both A & B Neither A nor B
Answer:
A only If cylinder leakage exceeds 20%, check for air escaping the
tailpipe, the PCV valve opening in the rocker arm cover, and the top of
the throttle body or carburetor. Air leaking from the tailpipe usually
indicates an exhaust valve leak
Question 2:
23. during a compression test, a cylinder has 40% of the specified
compression reading. When the tech performs a wet test, the
compression reading on this cylinder has 75% of the specified reading.
The cause of the low compression reading could be worn piston rings a
burned exhaust valve a bent intake valve a worn camshaft lobe
Answer:
worn piston rings if compression increases during a wet test, this
indicates worn piston rings. Compression would not increase if an
exhaust valve is burned, intake valve is bent, or camshaft lobe is worn.
, Question 3:
35. the customer complains that the engine cranks but does not start; the
first thing to check should be valve train operation battery voltage
Answer:
valve train operation if the engine cranks properly, the battery is not the
problem. Compression would not be the FIRST test, and because engine
vacuum is low during a crank, a vacuum test would not be conclusive.
Question 4:
40. during a cylinder balance test on an engine with fuel injection, one
cylinder provides very little rpm drop. Tech A says the ignition system
may be misfiring on that cylinder. Tech B says the engine may have an
intake manifold vacuum leak. A only B only Both A & B Neither A nor B
Answer:
Both A&B Both a misfiring ignition system and an intake manifold leak
could cause a cylinder to contribute too little power
Question 5:
54. while discussing basic diagnostic procedures, Tech A says the most
complicated diagnostic tests should be performed first. Tech B says that
you should first question the customer to obtain as much info as possible
about the problem A B A & B Neither
Answer:
B Always attempt the more simple diagnosis first
