ASE-A8 Engine performance Latest 20023 Already Passed

ASE-A8 Engine performance Latest 20023 Already Passed If the compression is 5 psi and the oem spec is 140 psi, what most likely is the cause? A, worn piston ring. B, burnt valve. Both A and B What most likely is the cause if the compression doesn't go up during a wet compression test? A, burnt valve. B, worn piston ring. A What most likely is the cause if the compression goes up during a wet compression test? A, burnt valve. B, worn piston ring. B 2. Blue smoke is coming from the exhaust pipe of a vehicle, what most likely is the cause? A, worn piston ring. B, bad head gasket. A 3. A vacuum guage is connected to the intake manifold of an engine and the engine is run at 2000 rpm. During the test, the pointer on the guage fluctuates rapidly between readings of 10 and 20 inches of vacuum. These test results point to: A, a leaking intake manifold. B, worn piston rings. C, worn valve guides. D, a week or broken valve spring. D, a weak or broken valve spring would cause a vacuum guage to fluctuate or jump from high to low readings. 4. Engine detonation (knock) could be caused by any of the following Except: A. a lean air/fuel mixture B. retarded ignition timing C. excess carbon in the the combustion chambers D. a stuck-closed EGR valve B. Advanced ignition timing will cause a knock, but retarded timing will not. 5. A vehicle with electronic ignition hesitates and stumbles during acceleration. The problem goes away when the vacuum advance hose is disconnected and plugged. Technician A says that a stuck vacuum advance mechanism could be the cause. Technician B says that an intermittent open in the pickup coil leads could be the cause. Who is right? A. Technician A only B. Technician B only C. Both A and b D. Neither A or B B. If a vacuum advance mechanism were stuck, the problem would not change if the vacuum hose is connected or disconnected. When the vacuum changes to the vacuum advance mechanism and the distributor plate moves, this may move the wires to the pick-up causing a short or open which would cause the pick-up signal to be lost momentarily. 6. Technician A says that spark advance on and engine can be tested by listening to the way the engine sounds at higher rpms. Technician B says that spark advance on an engine can be tested with a timing light that incorporates an ignition advance meter. Who is right. A. Technician A only B. Technician B only C. Both A and B D. Nether A or B B. to accurately measure spark advance use a timing light. The spark advance cannon be determined by listening to the way the engine sounds. 7. A regular customer presents his vehicle for service. He describes symptoms of poor drive ability and says that the vehicle has been repaired for the same problem in the past. Which of the following you should do first? A. connect the vehicle to an engine analyzer B. check for diagnostic trouble codes. C. check the vehicle service history and check for TSBs, service campaigns and recalls D. perform a cylinder balance test C. Checking vehicle service history would point you in the right direction. 8. Two Technicians are listening to a tapping noise coming from the top end of a v8 engine. Technician A says the noise could be a valve needing adjustment. Technician B says the the noise could be an exhaust leak. who's is right? A. Technician A only. B. Technician B only C. Both A and B D. Neither A or B C. A tapping noise that doesn't go away after engine warm up could be caused by worn valvetrain components or excessive valvetrain clearance. A similar type of noise would be cause by and exhaust leaks the exhaust manifold/cylinder head junction. 9. Technician A says a high spike line on an oscilloscope indicates a disconnected or open plug wire. Technician B says a high spike line on an oscilloscope indicates a closed gap on a spark plug. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A. If a spark plug gap were closed, the oscilloscope would indicate a very low spike line. 10. A vehicle can be started with great difficulty, but lacks power, and will not idle. Technician A says says that there could be hole or a tear in the duct between the mass air flow sensor and the throttle body. Technician B says that a restricted fuel filter is the problem. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A. a fuel filter would not be the cause of the problem 11. A vehicle is towed in with a 'crank but won't start' condition. A 'noid' light test finds no injector pulses, and Technician A says a vehicle needs a computer. Technition B finds no spark, and says the vehicle needs an ignition module. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B D. Both Technicians are jumping to conclusions. Further diagnostics are required to located the defective component. 12. Technician A says that evidence of cylinder wear can be found using a cylinder leakage tester. Technician B says that a blown head gasket can be found using a cylinder leakage tester. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Nether A or B C. Air blowing into crankcase indicates worn rings, a piston, or a cylinder. a blown head gasket would cause air to come out of the radiator with would indicate a blown head gasket, or a cracked cylinder head or block. 13. A poor running vehicle has low fuel volume. Technician A tests the electrical connector at the tank, and finding system voltage available, says the vehicle needs a pump. Technician B says high circuit resistance may prevent the pump from operating properly. Who's right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B B. High resistance would cause the pump from not working properly. 14. An engine with an electric fuel injection system has high fuel pressure at idle. This could be cause by a: A. low manifold vacuum B. leaking fuel pump check valve C. plugged fuel injection valve D. high manifold vacuum A. If the manifold vacuum is low, the fuel pressure regulator will restrict the fuel return and increase the fuel pressure. 15 With the engine off, vacuum is applied to a positive back pressure EGR valve using a hand held vacuum pump. Technician A says that the EGR valve should open. Technician B says that the valve will not open unless a restriction is created in the exhaust and the engine is started. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B B. A positive back pressure EGR valve needs exhaust pressure to open. 16. Technician A says that valves should be adjusted when when the piston is at TDC on the compression stroke and both valves are closed. Technician B says that hydrologic lifter should be adjusted to zero lash. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A. At TDC on the compression stroke will position the intake and exhaust valve lifters/cam followers onto the base circle of their respective cam lobes. With the engine in this position, the valves can be adjusted. Technician B is wrong because hydronic lifters must be adjusted further than zero lash. 17. While the engine is running, a technician pulls the PCV valve out of the valve opening and places his finger over the valve. No vacuum is left. Technician A says that the PCV valve could be stuck closed. Technician B says that the hose between the intake manifold and the PCV valve could be plugged. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B C. If the PCV valve is good, the hose from the PCV valve is most likely plugged. 19. A vehicle gets poor fuel mileage and has poor heater performance. Which of the following could be the cause? A. a bad ECT sensor B a defective fan clutch C. a clogged cooling system D. a stuck open thermostat D. A stuck open thermostat won't allow a engine to come to operating temperature. Heater performance will be poor because the engine coolant will not be hot enough. A rich air/fuel mixture will be caused when the ECT sensor tells the PCM that the engine isn't up to temp. 20. A vehicle with electronic fuel injection gets poor gas mileage. Engine tests show a rich mixture. Technician A says that a bad O2 sensor could be the cause. Technician B says that a bad IAT sensor could be the cause. Who is right? A. Technician A only. B. Technician B only C. Both A and B D. Neither A or B C 21. With a DMM connected, the O2 sensor reads above 550 millivotls constantly. Technician A says that thefuel mixture is probably too rich. Technician B says the fuel mixture may be too lean or there may be an exhaust leak near the sensor. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A. Too high of voltage indicates a rich mixture 22. There are 2 types of MAP sensors: the analog signal type, which is tested with a voltmeter, and the frequency type that that is tested with a Hertz meter or a digital tachometer. To determine which type the technician has, he performs a reference voltage and signal voltage check. the signal voltage doesn't change from 2.5 volts. It most likely is: A. frequency type B. an analog type C. could be either D. neither of the above A 23. A vehicle has sluggish performance and high fuel consumption. Testing reveals that the vehicle fails to enter closed loop operation. Technician A says the ECT sensor may be defective. Technician B says the TP (throttle position) sensor may be set incorrectly. Who is right? A 24. A vehicle is towed in for a no crank no start condition. Spark tests good, and an examination of the throttle body shows fuel pouring from the TBI injector when the engine is cranked. Technician A says the fuel injector is stuck open. Technician B says the PCM driver for the injector is shorted. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B B 25. A turbocharged vehicle performs poorly and lacks power. All of the following could be the cause EXCEPT: A. restricted intake duct B. a wastegate that is stuck open C. failed turbocharger shaft bearing D. a wastegate that is stuck closed D. 26. An oxygen sensor voltage is being monitored on a scope type analyzer. A pattern is observed to change from 0.25 volts to 0.8 volts in a regular, series of flattopped 'hills'. Technician A says that this is normal, closed loop operation. Technician B says that this indicates intermittent operation, and the sensor needs replacement. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A 27. When troubleshooting a slow drain on the battery, which diagnosis tool should be used? A. Ohmmeter B. Ammeter C. Voltmeter D. Test light B 28. While testing a starting circuit on a V8 engine, the technician finds that the engine cranks slowly, the starter current draw is 90 amps, and the battery voltage while cranking is 11 volts. What should the technician do next? A. check the voltage drop of the starter motor circuit B. test the battery capacity C. replace the starter motor, as a short is indicated D. determine the condition of the engine A 29. A V6 engine with distributorless ignition breaks up on acceleration, but gets smoother when reaching cruise. Technician A says a bad coil pack is the problem. Technician B says the cam sensor must be replaced. Who was right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A 30. Blue-gray smoke comes from the tailpipe of a vehicle during deceleration. Technician A says that this is most likely due to bad valve seals. Technician B says that the cause could be clogged oil return passages. Who was right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B C 31. Technician A says that an incorrect ignition pick-up coil gap can cause a misfire. Technician B says that when testing the pick-up coil with an ohmmeter, the meter should read infinity when the ohmmeter is connected to both pick-up coil leads. Who is right? A 32. Hall effect sensors normally produce a: A. Sine Waveform B. Triangle Waveform C. Saw Waveform D. Square Waveform D: Square waveform 33. Technician A says that excessive resistance in the voltage side of the charging circuit can cause a low charging rate. Technician B says that too much resistance in the circuit will cause higher than normal voltage drop. Who is right? C. 34. The initial timing and spark advance are being checked on an older vehicle with distributor ignition. Technician A says that the engine must be accelerated when checking how much the timing is being advanced by the distributor vacuum advanced unit. Technician B says that the vacuum line to the vacuum advance should be disconnected and plugged before checking the ignition timing. Who is right? 35. Which of the following would cause a spark miss? A. High engine temperature B. Low fuel pressure C. Dirty throttle body and IAC D. Distributor cap and carbon track 36. All of the following symptoms of insufficient exhaust gas recirculation EXCEPT A. Spark knock B. Stalling C. Surging at cruise D. Increase NOx emissions 37. When testing a catalytic converter with an exhaust pyrometer, the difference between the surface temperature of the converter inlet and outlet should be _____ with the engine at normal operating temperature. A. 50 F (10 C) B. 100 F (38 C) C. 150 F (66 C) D. 200 F (93 C) 38. The EVAP system is designed to: A. Keep fuel vapors from escaping fuel tank B. Capture fuel vapor and route them to the catalytic converter, where they are burned C. Purge fuel vapors from from the charcoal canister to atmosphere D. Capture fuel vapors and route them to eh engine where they become part of the air/fuel mixture and are burned during combustion 39. Which of the following sensors can be checked by measuring the pulse width of the of the fuel injector? A. TP (Throttle Position) sensor B. VSS (Vehicle Speed Sensor) C. MAF (Mass Air Flow) sensor D. CKP (Crankshaft Position) sensor 40. An IAT sensor is being tested. Technician A says that the resistance should be checked on and NTC. (Negative Temperature Coefficient) sensor. Technician B says that this voltage drop across the sensor should be checked on this type of sensor. Who is right? 41. The Map sensor voltage on a vehicle is measured with the engine running at idle and found to be almost 5 volts. Technician A says that this voltage is too high for idle speed. Technician B says that this voltage will cause the engine to run extremely rich. Who is right? 42. The engine is in a vehicle running at normal operating temperature has a rough idle and black smoke coming from the exhaust. All of the following could be the cause EXCEPT: A. EGR valve is stuck closed B. EVAP canister purge solenoid stuck open C. fuel pressure too high D. fuel injector(s) stuck open 43. A Vehicle is towed in with a 'no start' condition. The technician disconnects the coil wire from the distributor cap, connects a suitable spark tester and checks for a good spark while cranking the engine. If there is no spark, all of the fallowing could be the cause EXCEPT: A. A problem in the ignition primary circuit B. A problem in the ignition secondary circuit C. A bad coil D. A bad distributor pick-up coil 44. A technician suspects that a faulty CMP (Camshaft Position) sensor is the cause of a drivability complaint. In order to test the sensor, he must first know what type it is. Since the sensor is equipped with a 3-wire connector, the sensor: A. is a Hall effect type B. is a magnetic reluctant type C. creates a voltage D. is a permanent magnetic generator 45. An alternator output harness (pigtail) needs to be replaced. Technician A says that a pencil soldering iron should be used to ensure a good connection. Technician B says that a butt slice sleeve connector will be sufficient. Who is right? 46. Which of the diagnostic methods can be used to determine which cylinder is leaking combustion chamber gas into the cooling system? A. observing the radiator coolant for bubbles while the enginenis running B. placing a vial of a chemical that is sensitive to combustion gases over the radiator filler neck while the engine is running C. holding an exhaust analyzer probe over the radiator filler neck while checking for a reading on the exhaust analyzer D. observing the radiator coolant for bubbles while performing a cylinder leakage test 47. A vehicle's tailpipe 48 49 50 51 52 53 54