Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 25, Problem 3MC
A defective LAT sensor or circuit may cause the fol lowing problems, except.
- hard engine starting
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Technician 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?
Which is not a cause of detonation?
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Using a fuel grade higher than recommended
The Diesel Opacity (Smoke Meter) Emissions Inspection procedure requires that the Certified Inspector use an approved diesel opacity (smoke meter) tester to check emissions at the tailpipe and that the following must also be hooked up during the test:
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2. Oil temperature probe only.
3. RPM (tach) probe only.
4. Camshaft postion sensor.
Chapter 25 Solutions
Automotive Technology
Ch. 25 - OBD II systems use several modes of operation....Ch. 25 - List the four ways that individual components can...Ch. 25 - Prob. 3SACh. 25 - When an engine is running lean, the voltage signal...Ch. 25 - List six steps involved in performing a visual...Ch. 25 - Many control systems have operating modes that can...Ch. 25 - True or False? A bad ground can cause an increase...Ch. 25 - True or False? An A/F ratio sensor can be tested...Ch. 25 - Which of the following statements about zirconium...Ch. 25 - A system may fail the catalyst monitor test for...
Ch. 25 - A defective LAT sensor or circuit may cause the...Ch. 25 - Which of the following is the least likely cause...Ch. 25 - Technician A says that an oxygen sensor can be a...Ch. 25 - Prob. 2ASRQCh. 25 - While discussing ECT sensor diagnosis: Technician...Ch. 25 - While discussing Hall-effect vehicle speed sensor...Ch. 25 - While discussing TP sensor diagnosis: Technician A...Ch. 25 - While diagnosing the cause of a hard starting...Ch. 25 - While discussing testing OBD II system components:...Ch. 25 - When testing a frequency varying MAF: Technician A...Ch. 25 - Technician A says that a faulty MAF sensor can...Ch. 25 - While discussing the MIL on OBD 11 systems:...
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- Which of the following is the least likely cause of a no-start condition? Faulty CKP sensor Faulty KS Fuel or ignition system faults Faulty PCM wiringarrow_forwardTrue or False? Engine misfires can cause a catalytic converter to overheat.arrow_forwardLower compression ratios reduce NOx emissions. True Falsearrow_forward
- A restricted catalytic converter can cause all of the following except. a. stalling after the engine starts b. popping or backfiring through the intake manifold c. a drop in engine vacuum d. increased power at high speedsarrow_forwardTechnician A says that a faulty MAF sensor can cause the engine to run lean. Technician B says that a faulty MAP sensor can cause the engine to not start. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardA rich air-fuel ratio causes HC emissions to ________.arrow_forward
- Parts differences between a 2-stroke engine and 4-stroke enginearrow_forwardTechnician A says that the catalytic converter is used only to quiet the noise of the exhaust. Technician B says that the catalytic converter is used to alter the contents of the engines exhaust. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardWhile discussing the catalyst efficiency monitor: Technician A says that if the catalytic converter is not reducing emissions properly, the voltage frequency increases on the downstream HO2S. Technician B says that if a fault occurs in the catalyst monitor system on three drive cycles, the MIL will be illuminated. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
- Which of the following would not cause a hard-to-start problem on a PFI engine? a. A defective IAC valve b. A defective oxygen sensor c. A leaking fuel pressure regulator d. Dirty injectorsarrow_forwardTrue or False? On some engines, if the gap between the crankshaft sensor and its trigger wheel is outside specifications, the sensor should be replaced.arrow_forwardWhen should the ATF level be checked on most vehicles? a. When the engine is cool b. When the engine is at operating temperature and the engine is off c. When the engine is at operating temperature and the engine is on d. It does not matterarrow_forward
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