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 9RQ
When the throttle plates are closed in a port injection system, where does the air needed for idle speeds come from?
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When the throttle plates are closed in a port injectionsystem, where does the air needed for idle speedscome from?
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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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- When the engine is idling, the pressure regulator in a PFI system provides ____fuel pressure compared to the fuel pressure at wide-open throttle.arrow_forwardList four service precautions for working on the fuel injection system.arrow_forward4- Explain the operation of the Common-Rail fuel injection system?arrow_forward
- While 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_forwardWhile discussing SFI systems: Technician A says that when the injection system fires according to crankshaft position and speed, it is operating in the synchronous mode. Technician B says that one of the advantages of SFI systems is that they are always in the synchronous mode. Who is correct?arrow_forwardWhat is the definition of actual air-fuel ratio?arrow_forward
- If the injector pulse width is increased on TBI, MFI, or SFI systems, the air-fuel ratio becomes _____.arrow_forwardTechnician 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 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?arrow_forward
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