Exam 3: Diagnosing Engine Problems

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Technician A says an indication of preignition could be a hole burned in the center of a piston. Technician B says detonation is an explosion inside the cylinder. Which technician is correct?

(Multiple Choice)

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Question 41

When an engine runs for a long period with an excessively lean air-fuel mixture, what kind of engine damage can result?

(Short Answer)

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Question 42

A noise goes away when the spark plug wire for one cylinder is disabled. What could this noise be?

(Short Answer)

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Question 43

Technician A says if you remove the PCV valve from the valve cover and plug the end with your finger, the idle will increase if the valve is good. Technician B says that when you block the flow to the PCV valve, it will richen the air-fuel mixture. Which technician is correct?

(Multiple Choice)

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Question 44

Technician A says that with a vacuum leak, an engine with an oxygen sensor feedback fuel system can run fine when cold but rough when hot. Technician B says that advanced ignition timing will often cause an engine to run hot. Who is right?

(Multiple Choice)

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Question 45

Showing 41 - 45 of 45

Technician A says an indication of preignition could be a hole burned in the center of a piston. Technician B says detonation is an explosion inside the cylinder. Which technician is correct?

When an engine runs for a long period with an excessively lean air-fuel mixture, what kind of engine damage can result?

A noise goes away when the spark plug wire for one cylinder is disabled. What could this noise be?

Technician A says if you remove the PCV valve from the valve cover and plug the end with your finger, the idle will increase if the valve is good. Technician B says that when you block the flow to the PCV valve, it will richen the air-fuel mixture. Which technician is correct?

Technician A says that with a vacuum leak, an engine with an oxygen sensor feedback fuel system can run fine when cold but rough when hot. Technician B says that advanced ignition timing will often cause an engine to run hot. Who is right?

Engine Operation

Engine Shop Safety

Engine Removal, Disassembly, Inspection, and In-Chassis Repairs

Cleaning the Engine

Micrometer Practice

Cylinder Head: Parts and Service

Cylinder Head: Springs, Valves, and Valve Sets

Camshafts, Lifters, Timing Belts, and Chains

Cylinder Block: Inspection and Service

Crankshaft, Bearings, and Engine Balancing

Pistons, Rings, and Connecting Rods

Lubrication

Cooling System

Engine Hardware: Fasteners, Thread Repair, and Gaskets

Reassembly and Starting

Engine Breathing: Intake and Exhaust Systems

Turbochargers and Superchargers

Producing Power: Valve Timing, Power and Torque Measurement

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