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WorksheetsASE Engine Performance
Total questions: 10
Worksheet time: 8mins
Name
Class
Date
1.
The MAP sensor's vacuum hose is loose and cracking. Technician A says this sensor measures air mass to establish the fuel injector's base pulse width. Technician B says this sensor measures changes in intake manifold pressure. Who is correct?
a)
Tech A
b)
Tech B
c)
Both
d)
Neither
2.
A misfire is detected at the #3 cylinder of a COP ignition system. There is no power at the Bat+ terminal of the coil. Which of the following is the MOST likely cause of this condition?
a)
Resistance in the primary circuit
b)
An open between the coil and power source
c)
A leak in secondary insualation
d)
Resistance in the secondary circuit
3.
After performing a wet compression test, the pressure in each of the cylinders increased but remained below specifications. Technician A says this is caused by incorrect camshaft timing. Technician B says this is caused by worn piston rings. Who is correct?
a)
Tech A
b)
Tech B
c)
Both A and B
d)
Neither A or B
4.
An EGR valve vacuum solenoid has 18 "hg. as its vacuum source. The resistance checks out OK. Vacuum pressure is manually applied to the EGR valve with a pump and a slight stumble is noticed. There is little drop in rpm. This is caused by:
a)
A faulty Vacuum solenoid
b)
A poor vacuum source
c)
A restriction in the EGR passage
d)
A faulty EGR position sensor
5.
A cylinder power balance test is being performed on a vehicle with sequential port fuel injection. Two adjacent cylinders are under performing. Technician A says this could be caused by a restriction in the fuel injectors. Technician B says this could be caused by leaking secondary insulation. Who is correct?
a)
Tech A
b)
Tech B
c)
Both A and B
d)
Neither A or B
6.
A COP ignition system has no spark at any of the coils. Which of these is MOST likely causing this loss of spark?
a)
A faulty PCM driver
b)
Excess resistance in the primary circuit
c)
Excess resistance in the secondary circuit
d)
No power to PCM BAT+
7.
Technician A says the MAP sensor is located on the intake manifold and informs the PCM of intake manifold pressure. Technician B says the MAF sensor senses air flow in the air tube. It's signal indicates engine load to the PCM. Who is correct?
a)
Tech A
b)
Tech B
c)
Both A and B
d)
Neither A or B
8.
Two technicians are discussing a turbocharged engine. Technician A says the wastegate is a component used to control boost pressure. Technician B says when opened, the wastegate diverts exhaust gas from the turbine wheel. Who is correct?
a)
Tech A
b)
Tech B
c)
Both
d)
Neither
9.
Technician A says a (TPI) throttle position sensor is a potentiometer that indicates throttle angle. Technician B says a throttle position sensor can be tested for resistance with an ohmmeter. Who is correct?
a)
Tech A
b)
Tech B
c)
Both
d)
Neither
10.
A vehicle has a check engine light with codes indicating a problem with the enhanced evaporative emission system and a rich fuel condition. Technician A says a defective evaporative purge valve will cause a rich air fuel ratio. Technician B says the tank pressure sensor will notify the PCM of excessive tank pressure. Who is correct?
a)
Tech A
b)
Tech B
c)
Both
d)
Neither
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