ASE Study Guide with Complete Solutions

ASE Study Guide with Complete Solutions An engine makes a knocking noise with the transmission in DRIVE. The knocking noise is not heard in PARK or NEUTRAL. Which of these could be the cause? A)Excessive main bearing clearance B)Low oil pressure C)A cracked flexplate D)A broken piston ring - Answer-C)A cracked flexplate An engine is overheating and has white smoke coming from the tail pipe. The cooling system is pressure tested and will not hold pressure. This could be caused by: A) a blown head gasket. B) a restricted piston oil nozzle. C) a stuck-open thermostat. D) an incorrect PCV valve. - Answer-A) a blown head gasket. EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER, 2024 Page 2/57 An engine compression test identifies that one cylinder has low compression. During a leak down test of the cylinder, excessive leakage is observed and air is heard coming out of the tail pipe. Which of these could be the cause? A) Broken piston rings B) A blown head gasket C) A leaking exhaust manifold gasket D) An exhaust valve not seating - Answer-D) An exhaust valve not seating A technician is reassembling a cylinder head. In the illustration shown, which of these is the technician measuring? A) Installed stem height B) Valve spring squareness C) Installed spring height D) Valve spring pressure - Answer-C) Installed spring height An engine produces blue smoke when accelerating from a stop. Technician A says that worn exhaust valve guides could be the cause. EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER, 2024 Page 3/57 Technician B says that worn exhaust valve seats could be the cause. Who is right? A) A only B) B only C) Both A and B D) Neither A nor B - Answer-D) Neither A nor B To determine piston-to-cylinder wall clearance, the diameter of the piston shown should be measured at: A)W B)X C)Y D)Z - Answer-C)Y Technician A says that the setup shown can be used to check cylinder taper. Technician B says that the setup shown can be used to check cylinder EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER, 2024 Page 4/57 out-of-round. Who is right? A) A only B) B only C) Both A and B D) Neither A nor B - Answer-C) Both A and B An engine overheats at higher rpms and returns to normal temperature at lower rpms. Which of these could be the cause? A) A stuck-on cooling fan relay B) A worn water pump belt tensioner C) A restricted heater core D) An incorrect coolant concentration - Answer-B) A worn water pump belt tensioner A fuel-injected engine has low fuel pressure at the fuel rail test port. This could be caused by a: A) restricted fuel filter. B) restricted fuel injector. C) stuck-closed fuel pressure regulator. EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER, 2024 Page 5/57 D) shorted fuel injector. - Answer-A) restricted fuel filter. An engine with a variable valve timing (VVT) system has stored a VVT performance DTC. Any of these could be the cause EXCEPT a: A) stuck-open oil filter bypass valve. B) restricted oil control solenoid screen. C) sticking camshaft actuator/phaser. D) restricted oil pump pickup screen. - Answer-A) stuck-open oil filter bypass valve. An automatic transmission does not hold in PARK. Technician A says that misadjusted shift linkage could be the cause. Technician B says that a roller clutch installed backwards could be the cause. Who is right? A) A only B) B only C) Both A and B D) Neither A nor B - Answer-A) A only A vehicle with an automatic transaxle and a properly tuned engine EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER, 2024 Page 6/57 accelerates poorly from a stop. Acceleration is normal above 35 mph. Which of these could be the cause? A) A worn front pump B) A failed torque converter C) A worn planetary gear set D) A low fluid level - Answer-B) A failed torque converter The transmission slips when cold. Which of these could be the cause? A) A shorted low/reverse pressure switch B) Line pressure is at maximum in 1st gear C) A disconnected line pressure sensor D) Low line pressure - Answer-D) Low line pressure The automatic transaxle upshifts harshly during normal acceleration. The cause could be a failed: A) oxygen sensor. B) idle air control valve. C) throttle position sensor. D) intake air temperature sensor. - Answer-C) throttle position sensor. EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER, 2024 Page 7/57 With the transmission pan removed, the best way to pin-point an oil pressure leak is to: A) check the filter pick-up tube seal. B) check the line pressure. C) remove and check the valve body. D) perform an air pressure test. - Answer-D) perform an air pressure test. The tool in the setup shown is being used to remove the: A) stator support bushing. B) stator support seal. C) pump body torque converter support bushing. D) pump body torque converter seal. - Answer-A) stato