ENGINE PERFORMANCE
For every task in Engine Performance the following safety requirement must
be strictly enforced:
Comply with personal and environmental safety practices associated with clothing;
eye protection; hand tools; power equipment; proper ventilation; and the handling,
storage, and disposal of chemicals/materials in accordance with local, state,
and federal safety and environmental regulations.
VIII. ENGINE PERFORMANCE
A. General Engine Diagnosis
1. Identify and interpret engine performance concern; determine necessary action.
P-1
2. Research applicable vehicle and service information, such as engine management
system operation, vehicle service history, service precautions, and technical
service bulletins. P-1
3. Locate and interpret vehicle and major component identification numbers (VIN,
vehicle certification labels, and calibration decals). P-1
4. Inspect engine assembly for fuel, oil, coolant, and other leaks; determine
necessary action. P-2
5. Diagnose abnormal engine noise or vibration concerns; determine necessary
action. P-2
6. Diagnose abnormal exhaust color, odor, and sound; determine necessary action.
P-2
7. Perform engine absolute (vacuum/boost) manifold pressure tests; determine
necessary action. P-1
8. Perform cylinder power balance test; determine necessary action. P-1
9. Perform cylinder compression tests; determine necessary action. P-1
10. Perform cylinder leakage test; determine necessary action. P-1
11. Diagnose engine mechanical, electrical, electronic, fuel, and ignition
concerns with an oscilloscope and/or engine diagnostic equipment; determine
necessary action. P-1
12. Prepare 4 or 5 gas analyzer; inspect and prepare vehicle for test, and obtain
exhaust readings; interpret readings, and determine necessary action. P-1
13. Verify engine operating temperature; determine necessary action. P-1
14. Perform cooling system pressure tests; check coolant condition; inspect
and test radiator, pressure cap, coolant recovery tank, and hoses; perform necessary
action. P-1
15. Verify correct camshaft timing. P-2
VIII. ENGINE PERFORMANCE
B. Computerized Engine Controls Diagnosis and Repair
1. Retrieve and record stored OBD I diagnostic trouble codes; clear codes. P-2
2. Retrieve and record stored OBD II diagnostic trouble codes; clear codes.
P-1
3. Diagnose the causes of emissions or driveability concerns resulting from
malfunctions in the computerized engine control system with stored diagnostic
trouble codes. P-1
4. Diagnose emissions or driveability concerns resulting from malfunctions in
the computerized engine control system with no stored diagnostic trouble codes;
determine necessary action. P-1
5. Check for module communication errors using a scan tool. P-2
6. Inspect and test computerized engine control system sensors, powertrain control
module (PCM), actuators, and circuits using a graphing multimeter (GMM)/digital
storage oscilloscope (DSO); perform necessary action. P-1
7 Obtain and interpret scan tool data. P-1
8. Access and use service information to perform step-by-step diagnosis. P-1
9. 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. P-3
VIII. ENGINE PERFORMANCE
C. Ignition System Diagnosis and Repair
1. Diagnose ignition system related problems such as no-starting, hard starting,
engine misfire, poor driveability, spark knock, power loss, poor mileage, and
emissions concerns on vehicles with electronic ignition (distributorless) systems;
determine necessary action. P-1
2. Diagnose ignition system related problems such as no-starting, hard starting,
engine misfire, poor driveability, spark knock, power loss, poor mileage, and
emissions concerns on vehicles with distributor ignition (DI) systems; determine
necessary action. P-1
3. Inspect and test ignition primary circuit wiring and solid state components;
perform necessary action. P-2
4. Inspect, test and service distributor. P-3
5. Inspect and test ignition system secondary circuit wiring and components;
perform necessary action. P-2
6. Inspect and test ignition coil(s); perform necessary action. P-1
7. Check and adjust ignition system timing and timing advance/retard (where
applicable). P-3
8. Inspect and test ignition system pick-up sensor or triggering devices; perform
necessary action P-1
VIII. ENGINE PERFORMANCE
D. Fuel, Air Induction, and Exhaust Systems Diagnosis and Repair
1. Diagnose 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 on vehicles
with carburetor-type fuel systems; determine necessary action. P-3
2. Diagnose 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 on vehicles
with injection-type fuel systems; determine necessary action. P-1
3. Check fuel for contaminants and quality; determine necessary action. P-3
4. Inspect and test mechanical and electrical fuel pumps and pump control systems
for pressure, regulation and volume; perform necessary action. P-1
5. Replace fuel filters. P-1
6. Inspect and test cold enrichment system and components; perform necessary
action. P-3
7. Inspect throttle body, air induction system, intake manifold and gaskets
for vacuum leaks and/or unmetered air. P-2
8. Inspect and test fuel injectors. P-2
9. Check idle speed and fuel mixture. P-2
10. Adjust idle speed and fuel mixture. P-3
11. Inspect the integrity of the exhaust manifold, exhaust pipes, muffler(s),
catalytic converter(s), resonator(s), tail pipe(s), and heat shield(s); perform
necessary action. P-2
12. Perform exhaust system back-pressure test; determine necessary action. P-1
13. Test the operation of turbocharger/supercharger systems; determine necessary
action P-3
VIII. ENGINE PERFORMANCE
E. Emissions Control Systems Diagnosis and Repair
1. Positive Crankcase Ventilation
1. Diagnose oil leaks, emissions, and driveability problems resulting from malfunctions
in the positive crankcase ventilation (PCV) system; determine necessary action.
P-2
2. Inspect, test and service positive crankcase ventilation (PCV) filter/breather
cap, valve, tubes, orifices, and hoses; perform necessary action. P-2
2. Exhaust Gas Recirculation
1. Diagnose emissions and driveability problems caused by malfunctions in the
exhaust gas recirculation (EGR) system; determine necessary action. P-1
2. Inspect, test, service and replace components of the EGR system, including
EGR tubing, exhaust passages, vacuum/pressure controls, filters and hoses; perform
necessary action. P-2
3. Inspect and test electrical/electronic sensors, controls, and wiring of exhaust
gas recirculation (EGR) systems; perform necessary action. P-2
3. Exhaust Gas Treatment
1. Diagnose emissions and driveability problems resulting from malfunctions
in the secondary air injection and catalytic converter systems; determine necessary
action. P-2
2. Inspect and test mechanical components of secondary air injection systems;
perform necessary action. P-3
3. Inspect and test electrical/electronically-operated components and circuits
of air injection systems; perform necessary action. P-3
4. Inspect and test catalytic converter performance. P-1
4. Intake Air Temperature Controls
1. Diagnose emissions and driveability problems resulting from malfunctions
in the intake air temperature control system; determine necessary action. P-3
2. Inspect and test components of intake air temperature control system; perform
necessary action. P-3
5. Early Fuel Evaporation (Intake Manifold Temperature) Controls
1. Diagnose emissions and driveability problems resulting from malfunctions
in the early fuel evaporation control system; determine necessary action. P-3
2. Inspect and test components of early fuel evaporation control system; perform
necessary action. P-3
6. Evaporative Emissions Controls
1. Diagnose emissions and driveability problems resulting from malfunctions
in the evaporative emissions control system; determine necessary action. P-1
2. Inspect and test components and hoses of evaporative emissions control system;
perform necessary action. P-2
3. Interpret evaporative emission related diagnostic trouble codes (DTCs); determine
necessary action. P-1
VIII. ENGINE PERFORMANCE
F. Engine Related Service
1. Adjust valves on engines with mechanical or hydraulic lifters. P-1
2. Remove and replace timing belt; verify correct camshaft timing. P-1
3. Remove and replace thermostat. P-2
4. Inspect and test mechanical/electrical fans, fan clutch, fan shroud/ducting,
air dams, and fan control devices; perform necessary action. P-1
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