Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 31, Problem 5SA
How can you use a dual trace scope to make sure that the injectors are firing at the correct time?
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injector cleaning is being discussed. technician A uses a wire brush to clean the tips of the injectors. technician B soaks the injectors in cleaning solvent. who is correct?
An engine starts and runs briefly after a small quantity of fuel is put into the spark plug hole, but it doesn't not start when fuel is added to the carburetor throat. Tech a says that the problem may be that the exhaust valve is not closing completely due to carbon buildup. Tech b says it may be due to a defective carburetor mounting gasket. Who is correct?
A good injector makes a rhymic clicking sound as the injector is energized and de-energized several times each second.
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Chapter 31 Solutions
Automotive Technology
Ch. 31 - List four service precautions for working on the...Ch. 31 - What is indicated by a LTFT reading of 24 percent?Ch. 31 - Describe how testing GDI fuel systems differs from...Ch. 31 - What is the difference between the pulse width and...Ch. 31 - How can you use a dual trace scope to make sure...Ch. 31 - What are three possible problems that can allow...Ch. 31 - What is the purpose of having two accelerator...Ch. 31 - What is indicated by a negative LTFT value?Ch. 31 - What problem may result from dirt buildup on an...Ch. 31 - What is the difference between STFT and LTFT?
Ch. 31 - True or False? The signals from an air-fuel ratio...Ch. 31 - Prob. 2TFCh. 31 - Which of the following is the most likely cause of...Ch. 31 - The PCM checks for a closed throttle plate each...Ch. 31 - Which of the following would not cause a...Ch. 31 - While discussing the causes of...Ch. 31 - While discussing IAC valve diagnosis: Technician A...Ch. 31 - While discussing IAC motor removal, service, and...Ch. 31 - While discussing injector testing: Technician A...Ch. 31 - While discussing airflow sensors: Technician A...Ch. 31 - While discussing scan tool diagnosis of fuel...Ch. 31 - While discussing a high idle speed problem:...Ch. 31 - While discussing the causes of a rich air-fuel...Ch. 31 - While diagnosing an idle speed problem: Technician...Ch. 31 - While looking at fuel trim values: Technician A...
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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
- What is meant by sequential firing of fuel injectors?arrow_forwardWhich of the following ensures proper timing of the intake and exhaust valve events? The length of the tappets relative to the pushrods. Proper pairing of the gear set joining the crankshaft to the camshaft. The pulse timer mounted in series with the piston. The installation of the flywheel key.arrow_forwardWhile discussing central port injection systems: Technician A says that CPI systems use one injector and several injector nozzles. Technician B says that CPI systems open each injector sequentially. Who is correct? A.Technician A B.Technician B C.Both A and B D.Neither A nor Barrow_forward
- Technician A says that when using a flare-nut wrench, two wrenches must often be used. Technician B says to use an open-end wrench on fuel fittings. Who is right?arrow_forwardWhich of the following will cause one or more, but not all, firing lines to be higher than normal? a. High resistance in the spark plug wire b. Faulty fuel injector c. Defective spark plug d. All of the abovearrow_forwardTrue or False? The first step in removing an engine is usually the removal of the intake and exhaust manifolds.arrow_forward
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