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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