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ASE A1 (ENGINE REPAIR) EXAM LATEST
2025/2026 COMPLETE EXAM| 200 ACTUAL
EXAM QUESTIONS WITH CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+
when using a compression tester, the readings on the cylinders are all
even, but lower than spec. this could indicate:
- blown head gasket
- carbon buildup
- cracked head
- worn rings and cylinders - Correct Answer - worn rings and
cylinders -a low reading on two adjacent cylinders may indicate a blown head gasket -carbon buildup would cause a high reading -a low reading on two adjacent cylinders may indicate a cracked head
an engine is idling at 750 rpm. the pointer on the vacuum gauge is floating between 11 and 16 in Hg. The most likely cause is
- retarded timing
- advanced timing
- stuch EGR valve
- too lean idle mixture - Correct Answer - too lean idle mixture
all others would not result in gauge fluctuation 1 / 4
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The first step a Tech should take for diagnosis is:
- think of possible causes of the problem
- question the customer
- road test the vehicle
- listen to the customer - Correct Answer - listen to the customer
The customer says that the engine requires excessive cranking to start.
the LEAST likely cause of this problem would be:
- cracked cylinder block
- jumped timing belt
- faulty fuel pump
- stuck-open EGR valve - Correct Answer - cracked cylinder block
Which of the following is LEAST likely to cause engine noise?
- loose pistons
- worn cylinders
- worn main bearings
- loose camshaft bearings - Correct Answer - loose cam bearings
-loose pistons may cause a rapping noise while accel -worn cylinders may cause a rapping noise while accel -worn main bearings may cause a thumping noise when starting
The least likely first step in a diagnosis would be to:
- question the customer for more info
- be sure that the customer complaint is eliminated
- start with the most difficult test 2 / 4
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- road test the vehicle - Correct Answer - start with the most difficult
test
A cylinder balance test on a carbureted engine has revealed one cylinder is contributing less power than the others. The LEAST likely cause of
this is:
- faulty ignition system
- burned exhaust valve
- faulty carburetor
- leaking intake manifold - Correct Answer - faulty carburetor
-faulty ignition system, burned exhaust valve, and leaking intake manifold are likely to cause one cylinder to provide less power than others. The carburetor would not cause one single cylinder to contribute less power.
An excessive sulfur smell in the exhaust with a cat can be an indication
of:
- lean fuel mixture
- coolant leaking into combustion chamber
- rich fuel mixture
- vacuum leak - Correct Answer - rich fuel mixture
-lean fuel mixture would not cause a sulfur smell -coolant leaking into the chamber would cause a gray exhaust color -a vacuum leak would cause a rough idle that would decrease as engine speed increases
A low, steady vacuum gauge reading from 11 to 15 indicates: 3 / 4
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- burned or leaking valves
- late ignition timing
- weak valve springs
- leaking head gasket - Correct Answer - late ignition timing
-burned or leaking valves cause a fluctuation between 12 and 18 -weak valve springs cause a fluctuation between 10 and 25 -leaking head gasket would cause a fluctuation between 7 and 20
During a cylinder leakage test using a cylinder leakage tester, the reading exceeds 20%. The least likely place the tech would for leaking
air would be:
- tool air hose
- vehicle tailpipe
- radiator filter neck
- PCV valve opening in the rocker arm cover - Correct Answer - tool
air hose -leaking exhaust valve would cause air to escape through the tailpipe -a leaking head gasket or cracked head would cause air to escape from the radiator filler neck -worn piston rings would cause air to escape from the opening in the rocker arm cover
During a cylinder leakage test, air comes out of the PCV valve opening
in the rocker arm cover. This is an indication of:
- worn intake valves
- worn exhaust valves
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