ASE Engine Performance

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?

• Tech A
• Tech B
• Both
• Neither

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?

• Resistance in the primary circuit
• An open between the coil and power source
• A leak in secondary insualation
• Resistance in the secondary circuit

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?

• Tech A
• Tech B
• Both A and B
• Neither A or B

 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 faulty Vacuum solenoid
• A poor vacuum source
• A restriction in the EGR passage
• A faulty EGR position sensor

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?

• Tech A
• Tech B
• Both A and B
• Neither A or B

A COP ignition system has no spark at any of the coils. Which of these is MOST likely causing this loss of spark?

• A faulty PCM driver
• Excess resistance in the primary circuit
• Excess resistance in the secondary circuit
• No power to PCM BAT+

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?

• Tech A
• Tech B
• Both A and B
• Neither A or B

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?

• Tech A
• Tech B
• Both
• Neither

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?

• Tech A
• Tech B
• Both
• Neither

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?

• Tech A
• Tech B
• Both
• Neither