Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 34, Problem 10ASRQ
While discussing EVAP testing: Technician A says that most OEMs recommend that clean, high-pressure shop air be used to pressurize the system to test for leaks. Technician B says that nitrogen is typically used to drive the smoke through the system when checking the system with a smoke machine. Who is correct?
a. Technician A only
b. Technician B only
c. Both A and B
d. Neither A nor B
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Chapter 34 Solutions
Automotive Technology
Ch. 34 - A rich air-fuel ratio causes HC emissions to...Ch. 34 - What will result from too little EGR flow? And...Ch. 34 - What can result from a charcoal canister that is...Ch. 34 - What happens if a PCV valve is stuck in the open...Ch. 34 - Explain why the I/M 240 and similar tests are...Ch. 34 - How do you test the efficiency of a secondary AIR...Ch. 34 - List five common causes for high HC emissions.Ch. 34 - Describe carbon monoxide (CO) emissions in...Ch. 34 - An EGR valve that does not fully close can cause...Ch. 34 - A restricted catalytic converter can cause all of...
Ch. 34 - Which of the following statements about EVAP...Ch. 34 - As a catalytic converter begins to deteriorate,...Ch. 34 - How much pressure does a typical EVAP pressure...Ch. 34 - Which of the following exhaust gases is typically...Ch. 34 - Prob. 7MCCh. 34 - While discussing the proper way to test a...Ch. 34 - Prob. 2ASRQCh. 34 - While discussing catalytic converter diagnosis:...Ch. 34 - While discussing EGR valve diagnosis: Technician A...Ch. 34 - While discussing EGR valve diagnosis: Technician A...Ch. 34 - When discussing the diagnosis of a positive back...Ch. 34 - While diagnosing a PCV problem: Technician A says...Ch. 34 - Technician A says that the AIR system should pump...Ch. 34 - While discussing PCV system diagnosis: Technician...Ch. 34 - While discussing EVAP testing: Technician A says...
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- Explain how dye can be used to find leaks in the A/C system.arrow_forwardList at least five safety precautions that should be adhered to when working with fuel systems.arrow_forwardWhile discussing an inoperative blend air door: Technician A says that to check the proper functioning of the ductwork, a scan tool may be used to command the door to change position. Technician B says that in some cases you can reach under the dash to reconnect the cable or free a stuck flap. Who is right? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward
- Excluding lines, which of the following components are required to make simple hydrolic system? A) Reservoir, pump, filter & regulator. B) Reservoir, ACOV, pressure relief valve & actuator. C) Reservoir, pump, selector valve & actuator.arrow_forwardvapor lock is caused by fuel that does not vaporize easily in hot weather. T Farrow_forwardWhile discussing the future use of CO2 as a refrigerant: Technician A says that CO2 is nontoxic and presents little threat to the environment. Technician B says that only slight changes from conventional systems will be required because CO2 systems operate at low pressures and temperatures. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_forward
- Technician A says that some refrigerant leaks can also be traced to pinholes in the evaporator caused by acid, which forms when water and refrigerant mix. Technician B says that leaks are most often found at the compressor hose connections and at the various fittings and joints in the system. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_forwardWhich of the following statements about EVAP systems is not true? a. If the system is purging vapors from the charcoal canister when the engine is running at high speeds, rough engine operation will occur. b. Cracked hoses or a canister saturated with gasoline may allow gasoline vapors to escape to the atmosphere, resulting in gasoline odor in and around the vehicle. c. Rough idle, flooding, and other similar conditions can indicate a saturated canister. d. A vacuum leak in the system can cause starting and performance problems.arrow_forwardTechnician A says PVE refrigerant oil is com monly recommended for electric A/C compres sors. Technician B says PAG refrigerant oil can be used in many electric A / C compressors . Who is correct ?arrow_forward
- While diagnosing a PCV problem: Technician A says that a stuck open PCV valve will cause a richer than normal air-fuel mixture. Technician B says that oil in the air cleaner assembly can be caused by worn piston rings. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardDescribe flash gas, and tell how it affects systemcapacity.arrow_forwardDescribe the function of an electric evaporator pressure-regulating (EEPR) valve.arrow_forward
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