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 4RQ
Explain how the computer controls the air-fuel ratio on an EFI system.
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While 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? *
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a. Technician A
b. Technician B
c. Both A and B
d. Neither A nor B
explain briefly which input signals to the ECM control the turocharger ?
Explain the steps involved in disconnecting a multiport fuel injection
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_forwardECU collects and processes signals from O various engine sensors. controls the fuel level in the fuel tank. O O controls the engine lubrication. O controls the engine oil level. O controls the coolant in the engine.arrow_forwardWhen the engine is idling, the pressure regulator in a PFI system provides ____fuel pressure compared to the fuel pressure at wide-open throttle.arrow_forward
- asaparrow_forwardWhen the throttle plates are closed in a port injectionsystem, where does the air needed for idle speedscome from?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_forward
- Explain the steps involved in disconnecting a fuel line on a vehicle with: Multiport fuel injection (50 - 60 words) Gasoline Direct Iniection (30 - 40 words)arrow_forward4- Explain the operation of the Common-Rail fuel injection system?arrow_forwardList four service precautions for working on the fuel injection system.arrow_forward
- Describe the purpose of having both upstream and downstream oxygen sensors in an exhaust system.arrow_forwardWhile discussing electronic fuel injection principles: Technician A says that the PCM always adjusts the air-fuel ratio in response to the O2S signals. Technician B says that cold air is dense, which is why the PCM enriches the mixture when the engine is cold. Who is correct?arrow_forwardDifferentiate the two types of external combustion enginearrow_forward
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