ASE A1 - Practice Test (Section A)
2025/2026 Exam Questions and Answers
100% Guaranteed Success | Already
Rated A+
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,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
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
, 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.
35. the customer complains that the engine cranks but does not start; the
first thing to check should be
valve train operation
battery voltage
compression
engine vacuum - 🧠 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.
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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
2025/2026 Exam Questions and Answers
100% Guaranteed Success | Already
Rated A+
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,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
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
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
, 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.
35. the customer complains that the engine cranks but does not start; the
first thing to check should be
valve train operation
battery voltage
compression
engine vacuum - 🧠 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.
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.
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
