Engine Repair 1

A vehicle has white-colored exhaust emitting from its tailpipe at all engine speeds. Which of the following is causing this white-colored exhaust?

• Worn piston rings

• leaking head gasket

• worn valve guides

• leaking fuel injector

A vacuum gauge is connected to a port on the intake manifold of an engine with poor performance. The needle on the gauge fluctuates between 15 "hg and 20 "hg vacuum at idle. This vacuum gauge reading indicates:

• Late ignition or valve timing

• normal condition

• sticking valve or misfire

• exhaust gas restriction

New crankshaft bearings are installed after the main bore of an engine block has been line bored. Which of the following is correct?

• use oversized bearings

• align oil hole in bearing to oil passage in block

• worn bearings will increase oil pressure

• both a and b

A cylinder power balance test indicates two adjacent cylinders are underperforming. All of the following will cause this problem EXCEPT:

• a faulty fuel injector

• crossed ignition wire

• cracked cylinder heads

• a faulty head gasket

Technician A says that insufficient hydraulic lifter preload results in excessive valve train noise. Technician B says excessive hydraulic lifter preload results in a high intake manifold vacuum. Who is correct?

• tech a

• tech b

• both

• neither

A spark plug's electrode is covered with thick black carbon deposits. Which of the following is correct?

• the engine has a vacuum leak

• this is normal wear

• the piston rings are worn

• the fuel injector is leaking

One spark plug's ceramic insulator is longer than the others. Which of the following is correct?

• spark plugs have different heat ranges

• spark plugs are self cleaning

• spark plug resistance can be measured with a DMM

• all of the above

A vehicle with an eight-cylinder engine and a manual transmission has a knocking sound at the back of the engine whenever the engine is running. Which of the following is causing this noise?

• worn timing belt

• loose harmonic balancer

• loose flywheel bolts

• faulty power steering pump

The oil pressure switch on an engine may be faulty. All of the following are true about oil pressure switches EXCEPT:

• test switch with a DMM

• the warning lamp turns off as oil pressure rises

• the sensor is a variable resistor

• set the meter to ohms to measure continuity

During a cylinder leakage test, a hissing sound is heard coming from the throttle body. This sound indicates:

• A bad exhaust valve

• worn piston rings

• bad intake valve

• leaking head gasket