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 15RQ
Which of the following statements about fuel trim is not true?
a. A positive fuel trim value means that the PCM detects a lean mixture and is decreasing the pulse width to add more fuel to the mixture.
b. Short-term fuel trim represents changes made immediately in response to HO2S signals.
c. Long-term fuel trim represents changes made to set a new base pulse width.
d. Long-term fuel trim responds to the trends of the short-term fuel trim.
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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
- Which of the following statements about fuel trim is not true? a. A positive fuel trim value means that the PCM detects a lean mixture and is decreasing the pulse width to add more fuel to the mixture. b. Short-term fuel trim represents changes made immediately in response to HO2S signals. c. Long-term fuel trim represents changes made to set a new base pulse width. d. Long-term fuel trim responds to the trends of the short-term fuel trim.arrow_forwardWhich of the following statements about a fuel volume test is not true? a. This test measures the flow rate of the pump and can help isolate fuel system restrictions or weak pumps. b. The test is conducted by collecting the fuel dispensed by the certain during a period of time, normally 5 seconds. c. The flow of fuel into the container should be smooth and continuous with no signs of air bubbles. d. Poor results may indicate a bad pump or restrictions in the delivery system.arrow_forwardWhich of the following statements about carbondioxide is not true?a. CO2 levels are highest when the air-fuel ratiois slightly leaner than stoichiometric.b. The production of CO2 is directly related tothe amount of fuel consumed; therefore,more fuel-efficient engines produce less CO2c. To reduce CO2 levels in the exhaust, engineers are working hard to decrease fuel consumption to keep CO2low.d. The concern for CO2 emissions is one of theprimary reasons for the delayed use of alternative fuels for automobiles.arrow_forward
- State the different ways of monitoring fuel oil quality and how to maintain an acceptable value during operation.arrow_forwardWhile discussing chemicals that are currently added to refined gasoline in order to boost its octane: Technician A says methylcyclopentienyl manganese tricarbonyl (MMT) is normally added to gasoline. Technician B says ethanol can be added to boost the octane rating of gasoline. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardWhat is the device found in some fuel tanks to prevent fuel gauge fluctuations due to rough road surfaces?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_forwardtechnician A says lean ratio of 15:1 to 16:1 provide the best fuel economy. technician B says rich mixture have a ratio below 14.7:1 and provide more power from the engine but greater fuel combustion. who is correct?arrow_forwardWhich of the following statements about vehicles that are subject to Diesel Opacity Emissions (Smoke Meter) Inspection is NOT true? Only diesel powered vehicles with a Gross Vehicle Weight Rating (GVWR) over 8,500 pounds, per New York State Department of Environmental Conservation (DEC) regulations. “DEMA” will appear on a vehicle's New York State registration to indicate that the vehicle is subject to an opacity smokemeter test (in addition to the safety inspection). The “DEMA” (Diesel Emissions Metropolitan Area) Counties include Suffolk, Nassau, Queens, Kings, Richmond, New York, Bronx, Westchester & Albany. Only diesel powerearrow_forward
- While discussing air-fuel ratios: Technician A says that a stoichiometric mixture is theoretically the best combination of fuel and air to provide for total combustion. Technician B says that a stoichiometric mixture always results in complete combustion. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward3)arrow_forwardfuel additive are being discussed. technician A says adding oxygenates to gasoline increases fuel economy. technician B says adding 10 percent ethanol to gasoline may boost the octane rating 2.5 to 3 points. who is correct?arrow_forward
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