ASE identifies engine performance as an individual service area. The engine performance service area involves these systems. Ignition system:  components that ignite the fuel and air mixture at the proper time to create maximum power and minimum emissions. The fuel system: Components that transfer fuel from the fuel tank to the engine cylinders in the proper amounts so as to create maximum power and minimum emissions. The exhaust system: Components that remove combustion by-products from the engine. The emission control system: Components that reduces the amount of harmful gases emitted from... Show more

ASE identifies engine performance as an individual service area. The engine performance service area involves these systems. Ignition system:  components that ignite the fuel and air mixture at the proper time to create maximum power and minimum emissions. The fuel system: Components that transfer fuel from the fuel tank to the engine cylinders in the proper amounts so as to create maximum power and minimum emissions. The exhaust system: Components that remove combustion by-products from the engine. The emission control system: Components that reduces the amount of harmful gases emitted from the vehicle.

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ASE A8 Engine Performance Test

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20 Questions

1. What is being done in the illustration?
 

Adjusting electronic timingChecking Ignition Coil polarityChecking for spark with an ST125Adjusting ignition timing

2. Technician A says if the PCV valve is clogged, the engine could have a rough idle. Technician B says if the PCV valve rattles, then it does not need to be replaced. Who is right?

BothNeitherB onlyA only

3. Technician A says an engine could misfire under load if the ignition coil is tracked. Technician B says the pickup coil must dielectric grease under it. Who is right?

BothB onlyNeitherA only

4. This question has the word EXCEPT. For this question, look for the choice that could NOT meet the described situation. Read the entire question carefully before choosing your answer. Long-term fuel trim is a Self-Learned value. Disconnecting the MAF sensor or using a scan tool can clear a learned value. Many fuel system and emission components have a direct effect on the air/fuel mixture ratio. Self-Learning Control should be cleared each time any of these components have been replaced or repaired, EXCEPT:

PCV (positive crankcase ventilator) valveOxygen sensorFuel injectorsMAF (Mass Air Flow) sensor

5. Using a diagnostic strategy for a drivability concern, which of the following is generally the last step in that process?

Doing service checksChecking vehicle historyVerifying repairVerifying concern

6. Which of the following could cause a vehicle to run poorly after the battery was discharged or disconnected?

EPROM (erasable programmable read only memory) failedLearned value has been lost from RAMLearned value has been lost from ROMPROM (programmable read only memory) failed

7. A NO START condition is being diagnosed on a vehicle with electronic fuel injection (EFI) and distributorless ignition. Technician A says you should only use a DMM (Digital Multimeter) to check voltage values on PCM (Powertrain Control Module). Technician B says you should use a tool to check for spark at one of the spark plugs. Who is right?

A onlyB onlyBothNeither

8. Two technicians are discussing emission diagnosis. Technician A says an ignition misfire will increase CO and HC emissions and set a DTC (Diagnostic Trouble Code). Technician B says a misfire caused by a lean condition will increase HC and CO emissions without a DTC set. Who is right?

A onlyBothB onlyNeither

9. A scan tool is being used to check fuel injector balance. Based on service manual procedure, what is the expected result if the injector is functioning properly?

Engine RPM should decrease as each injector is turned offECT (Engine Coolant Temperature) Voltage should increaseECT (Engine Coolant Temperature) Voltage should decreaseEngine RPM should increase as each injector is turned off

10. Technician A says the on-board self-diagnostics test mode procedures should be conducted on a cold engine. Technician B says many diagnostic trouble codes (DTC) will monitor items only when the engine control system is in closed loop. Who is right?

NeitherB onlyBothA only

11. The OBD II (On Board Diagnostic Level 2) system on a vehicle interprets a disconnected spark plug as a misfire that could damage the three-way catalyst. On which trip will the ECM or PCM MOST likely turn on the Malfunction Indicator Lamp (MIL)?

3rd trip2nd trip4th trip1st trip

12. Technician A says paper service manuals are still used in today's service world. Technician B says to follow the recommended service procedures contained in the on-line service information. Who is right?

A onlyB onlyBothNeither

13. Which of the following should be the first step in diagnosing an engine performance concern?

Check for symptoms in the on-line service manualRoad test the vehicleRetrieve diagnostic trouble codesDiscussing concern with the vehicle owner

14. The plastic sensors on an electronically controlled EGR valve have melted. Technician A says excessive back pressure caused by a partially clogged exhaust system could be the cause. Technician B says to always check for a restricted exhaust whenever replacing a failed EGR valve sensor. Who is right?

BothB onlyA onlyNeither

15. A 12 volt test light is connected from the negative primary coil terminal to ground on an electronic distributor ignition (DI) system. The light flutters while cranking the engine. A spark tester does not fire when it is connected from the coil secondary wire to ground while cranking the engine. Which of the following is the MOST likely cause?

Defective ignition moduleDefective pickup coilDefective spark plugDefective ignition coil

16. Technician A says a crushed PCV hose affects idle on some engines and also can cause an oil leak. Technician B says when checking crankcase pressure at 2500 RPM, the PCV system should show a slight pressure in the crankcase at idle. Who is right?

A onlyBothNeitherB only

17. What component does the PCM or ECM monitor to determine the condition of the catalytic converter and will set a DTC (Diagnostic Trouble Code) if it fails?

Engine coolant temperature sensorFront and rear O2 (oxygen) sensorsThrottle position sensorFront and rear catalyst Temperature sensors

18. A technician suspects the EGR (Exhaust Gas Recirculation) valve is closed. Which of the following would indicate a closed EGR valve?

Rough idleStallingEngine surgeSpark knock

19. When looking for specific service information, what vehicle information is needed to locate the information?

Make, model and yearVehicle VINVehicle Build DateModel year

20. During an injector power balance test, a technician finds one injector has failed but is receiving a good power supply. What should be done next?

Voltage drop of the injector groundContinuity check between fuse and injectorsVoltage check at the ignition power feedContinuity check between PCM and injector