Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 30, Problem 11RQ
When the engine is idling, the pressure regulator in a PFI system provides ____fuel pressure compared to the fuel pressure at wide-open throttle.
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While discussing GDI systems: Technician A says that this type of system allows engines to run at very lean air-fuel ratios and at higher-than-normal compression ratios. Technician B says that GDI systems eliminate the need to have an EGR valve on the engine. Who is correct?
While discussing GDI systems: Technician A says this type of system allows engines to run at very lean air fuel ratios and at higher than normal compression ratios. Texhnician B says that GDI systems eliminate the need to have an EGR valve on the engine. Who is correct?
Technician A says that only offshore engines are permitted to use port-helix metering fuel systems on
EPA MY 2010 compliant and later engines. Technician B says that port-helix metering injection
pumps can be used on current diesel engines when the peak power rating is less than 70 BHP (52 kW).
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Chapter 30 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 30 - Explain the major differences between port fuel...Ch. 30 - What is meant by sequential firing of fuel...Ch. 30 - Prob. 3RQCh. 30 - Explain how the computer controls the air-fuel...Ch. 30 - True or False? Diesel engines require higher fuel...Ch. 30 - Describe the purpose of a manifold absolute...Ch. 30 - Explain the basic operation of a CSFI system.Ch. 30 - True or False? In GDI systems, the PCM controls...Ch. 30 - When the throttle plates are closed in a port...Ch. 30 - If the injector pulse width is increased, the...
Ch. 30 - When the engine is idling, the pressure regulator...Ch. 30 - Why are special fuel injectors needed for GDI...Ch. 30 - How does a GDI system provide for a stratified...Ch. 30 - How does a piezoelectric injector work?Ch. 30 - Which of the following statements about fuel trim...Ch. 30 - While discussing EFI systems: Technician A says...Ch. 30 - While discussing electronic fuel injection...Ch. 30 - While discussing returnless fuel systems:...Ch. 30 - While discussing central port injection systems:...Ch. 30 - While discussing throttle-by-wire systems:...Ch. 30 - While discussing the compression ratios used with...Ch. 30 - While discussing air-fuel ratios: Technician A...Ch. 30 - Technician A says that air-fuel ratios can be...Ch. 30 - While discussing GDI systems: Technician A says...Ch. 30 - While discussing SFI systems: Technician A says...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- When the throttle plates are closed in a port injection system, where does the air needed for idle speeds come from?arrow_forwardExplain why a small PCV valve opening is adequate at idle speed.arrow_forwardWhile discussing the compression ratios used with engines equipped with a GDI system: Technician A says that higher ratios can be used because ignition timing is normally very advanced. Technician B says that higher ratios are possible because the small droplets of fuel injected directly into the cylinder tend to cool the mixture in the cylinder. Who is correct?a.tech a b.tech b c. Both a and b d. Neither a nor barrow_forward
- If the injector pulse width is increased on TBI, MFI, or SFI systems, the air-fuel ratio becomes _____.arrow_forwardTechnician A says there is less heat energy in high octane gasoline and, therefore less power is genorated during combustion. Technician B says usung a higher octane gasoline than required will not produce more power inless the engine has a knock sensor that allows the system to adjust ignition timing to take advantage of the higher octane. who is correct?arrow_forwardTechnician A says that a turbocharger has its own self-contained lubrication system. Technician B says that a turbocharger should not be operated when the engines oil pressure is lower than 30 psi. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward
- Technician A says that air-fuel ratios can be regulated by controlling the “on time” of the injectors. Technician B says that the air-fuel ratio can be regulated by controlling the pressure applied to the individual injectors. Who is correct?arrow_forwardWhile discussing EFI systems: Technician A says that the PCM provides the proper air-fuel ratio by controlling the fuel pressure. Technician B says that the PCM provides the proper air-fuel ratio by controlling injector pulse width. Who is correct? * 1 point a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardThe gas/oil mixture used in a two stroke engine has been properly mixed. The carburetor high speed & cruise circuit is adjusted to lean. Tech a says that the lean adjustment may cause the engine to fail due to improper lubrication: tech b says that it may cause the engine to fail because of overheating. Who is correct?arrow_forward
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