10 Auto Engine Performance and Driveability
Checking Ignition Modules 321
Checking the Radio Capacitor 332
Ignition System Service 332
Setting Ignition Timing; Replacing Secondary Wires;
Replacing the Distributor Cap; Replacing Ignition
Coils; Replacing Ignition Modules; Replacing
Distributor Pickups; Replacing a Distributor;
Replacing Diesel Engine Glow Plugs
Follow-up for Ignition System Repairs 338
Chapter 17
Fuel System Diagnosis and Repair. . . . . . . . 343
Diagnosing the Fuel System 344
Visual Inspection; Fuel Pump Tests; Basic Injector
Checks
Using Test Equipment to Diagnose
the Fuel System 350
Scan Tool Testing; Multimeter Testing; Using the
Exhaust Gas Analyzer
Testing Components
in the Fuel-Delivery System 352
Checking Fuel Filters; Checking Fuel Lines; Checking
the Fuel Tank; Checking Fuel Quality; Fuel Injector
and ECM Control System Diagnosis; Checking Idle-
Air-Control Motors; Checking Turbocharger Boost
Pressure
Adjusting Components in the Fuel System 360
Throttle Position Sensors; Fuel Injector Pressure
Regulator; Throttle Valve
Replacing Components in the Fuel System 361
Fuel Lines and the Fuel Tank; Replacing Fuel Pumps
Cleaning Components in the Fuel System 363
Cleaning Gasoline Fuel Injectors; Cleaning Diesel
Fuel Injectors; Cleaning the Throttle Body
Servicing Components in the Fuel System 365
Removal and Service of the Throttle Body; Pressure
Regulator Service in a Multiport Fuel Injection
System; Gasoline Fuel Injector Replacement in a
Multiport Fuel Injection System; Diesel Fuel Injector
Replacement; Diesel Injection Pump Replacement
Follow-Up for Repairs in the Fuel System 369
Chapter 18
Diagnosis and Repair of the Emission Control
and Exhaust Systems . . . . . . . . . . . . . . . . . . 373
State Emissions Tests 374
Types of Emissions Tests; Equipment Used to Perform
Emissions Tests; Emissions Test Procedures; Preparing
a Vehicle for Emissions Testing
Preparing to Diagnose the Emission
and Exhaust Systems 377
Visual Inspection 378
Checking for Excessive Backpressure 379
Vacuum Gauge; Exhaust Backpressure Gauge
Exhaust Gas Analysis 379
Using an Exhaust Gas Analyzer; Understanding
Emissions Readings; Comparing Exhaust Analyzer
Readings with State Inspection Readings
Other Test Equipment 381
Performing a Drive Cycle 381
Checking Emission Control Components 384
Checking the PCV System; Checking Evaporative
Emission Control Systems; Checking EGR Valves;
Checking the Air Pump and Valves; Checking the
Thermostatic Air Cleaner; Checking Early Fuel
Evaporation (EFE) Systems; Checking Emissions
Filters; Testing Catalytic Converter Temperature
Checking Exhaust System Parts 392
Replacing Emissions and Exhaust Components 393
Evaporative Emissions Canister; Thermostatic
Air Cleaner; EFE Valve; Thermal Vacuum Valve;
EGR Valve; Air Injection System; Exhaust System
Components; Catalytic Converters
Follow-up for Emissions and Exhaust Repairs 399
Chapter 19
Engine Mechanical Diagnosis . . . . . . . . . . . 403
Diagnosing Engine Problems 404
General Inspection; Checking for Vacuum Leaks;
Using a Vacuum Gauge; Using an Engine Analyzer
to Check Cylinder Vacuum; Checking Engine
Compression; Cylinder Leakage Test; Checking
the Cooling System; Checking Turbocharger Boost
Pressure; Checking Superchargers; Checking Engine
Oil Pressure
Preparing to Check Internal Engine
Components 416
Checking Valve Train Parts; Checking Valve
Clearance; Checking Valve Lifters; Checking
Camshaft Lobe Lift
Engine Service Procedures 420
Repair Threaded Fasteners; Valve Train Adjustment;
Fan Clutch Replacement; Electric Cooling Fan and
Motor Replacement; Cooling System Thermostat;
Removing and Installing Air Plenums and Intake/
Exhaust Manifolds; Replacing Turbochargers;
Replacing Superchargers; Replacing Camshaft Drive
Components
Follow-up for Engine Repairs 431