Replacing Components in the Computer Control System . . . . . . . . . . . . . . . . 303 Oxygen Sensor Replacement | MAF and MAP Sensor Replacement | MAF Sensor Cleaning | Th rottle Position Sensor Replacement | Temperature Sensor Replacement | Knock Sensor Replacement | Crankshaft / Camshaft Position Sensor Replacement ECM Replacement. . . . . . . . . . . . . . . . . . . . . . 306 ECM Removal | ECM Installation | ECM Programming | OBD II Drive Cycle Follow-Up for Computer Control System Repairs . . . . . . . . . . . . . . . . . . . . . . . . 311 Chapter 16 Ignition System Diagnosis and Repair . . . . . . . . . . . . . . 315 Preparing to Diagnose the Ignition System. . . . 316 Visual Inspection. . . . . . . . . . . . . . . . . . . . . . . 316 Corona Discharge | Tests Performed During the Visual Inspection | Scan Tool Testing | OBD II Misfi re Monitor Checking the Ignition System Using Test Equipment . . . . . . . . . . . . . . . . . . . 319 Using a Scope | Using a Timing-Checking Device | Using an Ohmmeter Checking Ignition Coils . . . . . . . . . . . . . . . . . . 327 Checking Spark Plugs . . . . . . . . . . . . . . . . . . . 328 Checking the Distributor, Cap, and Rotor . . . . . 329 Testing Ignition Pickup Devices . . . . . . . . . . . . 329 Testing a Magnetic Pickup Coil for a Sine Wave Signal | Testing a Hall-Eff ect Switch for a Square Wave Signal | Testing Pickup Coils and Hall-Eff ect Switches with an Ohmmeter | Adjusting Pickup Coil Air Gap Checking Ignition Modules . . . . . . . . . . . . . . . 331 Checking the Radio Capacitor . . . . . . . . . . . . . 332 Ignition System Service . . . . . . . . . . . . . . . . . . 332 Setting Ignition Timing | Adjusting CMP Retard | 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 Th rottle-by-Wire Systems | Checking Turbocharger Boost Pressure Adjusting Components in the Fuel System . . . . 360 Th rottle Position Sensors | Fuel Injector Pressure Regulator | Th rottle 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 Th rottle Body Servicing Components in the Fuel System . . . . 365 Removal and Service of the Th rottle 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 | Air Cleaner Service 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 10 Auto Engine Performance and Driveability