Vehicle emission control system Chevrolet Tahoe 1

Arrangement of units of system of decrease in toxicity of the fulfilled gases
1.1 a. The location of the units of the exhaust gas toxicity reduction system on the 7.4 liter V8 engine. 1. Manifold absolute pressure sensor (MAP sensor) 2....

On-Board Diagnostic (OBD) System at a Glance
1. Failure of sensors and devices of some emission control systems may affect engine performance. Reading diagnostic codes and pinpointing a specific faulty...

Processor unit (ECM) / PROM / CALPAK block — removal and installation
Attention! To avoid damage to the processor unit, before disconnecting the battery from the ground or disconnecting the wires from the unit, turn the ignition...

Information sensors — location, removal and installation
Coolant temperature sensor 1. With the engine cold, press the latch (see photo) and disconnect the connector. Then unscrew the sensor. 2. Before installing a...

Oxygen Sensor — Replacement
Attention! It is recommended to unscrew the sensor after warming up the engine for 1-2 minutes. 1. Disconnect the battery from the ground. 2. Raise the vehicle...

Ignition system with electronically controlled ignition timing (EST-system)
1. The EST ignition system works in conjunction with the ECM to improve engine performance, economy and emissions. 2. Diagnostics of the system is performed in...

Electronic spark generation control system (ESC system)
Brief information 1. The ESC system delays ignition timing by up to 20°, reducing knocking during fuel combustion. 2. The system uses a knock sensor, which is...

Exhaust gas recirculation system
Models up to 1995 General description 1. The recirculation system includes a recirculation valve (see photo), solenoid valve and ECM processing unit. 2. The...

Air control system
1. The system provides additional air supply to the engine cylinders before it warms up. This reduces the toxicity of exhaust gases and accelerates the heating...

Positive crankcase ventilation (PCV) system
1, The positive crankcase ventilation system consists of a spool, a filter and vacuum hoses (see photo). 2. Maintenance of the system is reduced to periodic...

Air filter thermostat — general information
1. The air filter thermostat stabilizes the temperature of the air supplied to the injection module at the throttle. The air supply is provided by a flap that...

Catalytic converter — care instructions
1. Caring for the converter comes down to periodic inspection and checking for clogging of the entire exhaust system. Exhaust system clogging is recommended to...