Which condition can cause an engine's operating temperature to rise excessively only at high speeds?

• An inoperative electric cooling fan

• A partially obstructed radiator

• Low engine oil level

• A faulty radiator cap

Technician A says that a knock sensor is used to detect cylinder knocking and adjust ignition timing to prevent it. Technician B says that a knock sensor can adjust fuel pressure to prevent knocking. Who is correct?

• Neither Technician A nor Technician B

• Both Technician A and Technician B

• Technician B only

• Technician A only

When a turbocharged engine is producing less boost than expected, which of the following should be checked FIRST?

• Exhaust manifold pressure

• The wastegate actuator and control system

• Compression ratio of the engine

• The intake manifold gasket for leaks

In a diesel engine system, what is the main function of glow plugs?

• To increase exhaust gas temperature for emissions control

• To provide an additional fuel source for increased power

• To ignite the air/fuel mixture during the intake stroke

• To heat the combustion chamber to aid in cold starting

A technician finds oil in the coolant of an engine. What is the MOST likely cause?

• Faulty oil filter

• Damaged radiator hose

• A leaking head gasket

• Worn piston rings

A technician has determined that a vehicle's multiport fuel injection system is not delivering fuel to one of the cylinders. What should be checked FIRST to diagnose this problem?

• Fuel quality in the tank

• Injector pulse from the ECU

• Fuel pump operation

• Oxygen sensor readings

When a vehicle with an overhead cam engine has a timing belt failure, which of the following is MOST likely to occur?

• The oil pump will cease to function.

• The alternator will stop charging.

• The engine will experience reduced compression.

• The exhaust system will become clogged.

When an engine misfires, Technician A says it could be due to a faulty mass airflow sensor (MAF). Technician B says it could be because of a defective Variable Valve Timing (VVT) solenoid. Who is correct?

• Neither Technician A nor Technician B

• Technician A only

• Technician B only

• Both Technician A and Technician B

When checking for an intermittent stalling issue, which of the following is the LEAST likely to be checked first?

• Crankshaft position sensor signal

• Throttle body condition

• Fuel tank cap seal integrity

• Idle Air Control IAC valve operation

After rebuilding an automatic transmission, a technician notes that the transmission exhibits no forward movement, but reverse operates normally. What could be the cause of this condition?

• Misaligned torque converter

• Improperly seated forward clutch piston

• Clogged transmission fluid cooler

• Faulty reverse band