ASEP 208W - Engine Performance Level 3

1. Complete general Engine Performance related Level 3 NATEF tasks as listed below.
   1. Identify and interpret engine performance concerns; determine necessary action.
   2. Research applicable vehicle and service information, vehicle service history, service precautions, and technical service bulletins.
   3. Diagnose abnormal engine noises or vibration concerns; determine necessary action.
   4. Diagnose abnormal exhaust color, odor, and sound; determine necessary action
   5. Perform engine absolute (vacuum/boost) manifold pressure tests; determine necessary action.
   6. Perform cylinder power balance test; determine necessary action.
   7. Perform cylinder cranking and running compression tests; determine necessary action.
   8. Perform cylinder leakage test; determine necessary action.
   9. Diagnose engine mechanical, electrical, electronic, fuel, and ignition concerns; determine necessary action.
   10. Verify engine operating temperature; determine necessary action.
   11. Verify correct camshaft timing.
2. Complete Level 3 NATEF tasks related to Computerized Engine Controls as listed below.
   1. Retrieve and record diagnostic trouble codes, OBD monitor status, and freeze frame data; clear codes when applicable.
   2. Access and use service information to perform step-by-step (troubleshooting) diagnosis.
   3. Perform active tests of actuators using a scan tool; determine necessary action.
   4. Describe the importance of running all OBDII monitors for repair verification.
   5. Diagnose the causes of emissions or driveability concerns with stored or active diagnostic trouble codes; obtain, graph, and interpret scan tool data.
   6. Diagnose emissions or driveability concerns without stored diagnostic trouble codes; determine necessary action.
   7. Inspect and test computerized engine control system sensors, powertrain/engine control module (PCM/ECM), actuators, and circuits using a graphing multimeter (GMM)/digital storage oscilloscope (DSO); perform necessary action.
   8. Diagnose driveability and emissions problems resulting from malfunctions of interrelated systems (cruise control, security alarms, suspension controls, traction controls, A/C, automatic transmissions, non-OEM installed accessories, or similar systems); determine necessary action.
3. Complete Level 3 NATEF tasks related to Ignition System Diagnosis and Repair as listed below.
   1. Diagnose (troubleshoot) ignition system related problems such as no-starting, hard starting, engine misfire, poor driveability, spark knock, power loss, poor mileage, and emissions concerns; determine necessary action.
   2. Inspect and test crankshaft and camshaft position sensor(s); perform necessary action.
   3. Inspect, test, and/or replace ignition control module, powertrain/engine control module; reprogram as necessary.
   4. Remove and replace spark plugs; inspect secondary ignition components for wear and damage.
4. Complete Level 3 NATEF tasks related to Fuel, Air Induction, and Exhaust Systems as listed below.
   1. Diagnose (troubleshoot) hot or cold no-starting, hard starting, poor driveability, incorrect idle speed, poor idle, flooding, hesitation, surging, engine misfire, power loss, stalling, poor mileage, dieseling, and emissions problems; determine necessary action.
   2. Check fuel for contaminants; determine necessary action.
   3. Inspect and test fuel pumps and pump control systems for pressure, regulation, and volume; perform necessary action.
   4. Replace fuel filter(s).
   5. Inspect, service, or replace air filters, filter housings, and intake duct work.
   6. Inspect throttle body, air induction system, intake manifold and gaskets for vacuum leaks and/or unmetered air.
   7. Inspect and test fuel injectors.
   8. Verify idle control operation.
   9. Inspect integrity of the exhaust manifold, exhaust pipes, muffler(s), catalytic converter(s), resonator(s), tail pipe(s), and heat shields; perform necessary action.
   10. Inspect condition of exhaust system hangers, brackets, clamps, and heat shields