1.1 a. Location of exhaust gas toxicity reduction system units on the 7.4 liter V8 engine.
1. Manifold Absolute Pressure Sensor (MAP sensor)
2. Oxygen sensor
3. Throttle angle sensor (TPS sensor)
4. Coolant temperature sensor (1987-1992), or engine coolant temperature sensor (EST sensor) (since 1993)
5. Electronic ignition control knock sensor (ESC sensor) (except KS sensor) (on 1993 models with automatic transmission)
6. Knock sensor (KS sensor)
7. Crankcase ventilation sensor (RSU-sensor)
8. Air Pump (1987-1993)
9. Tank with gasoline vapor absorber
10. Fuel injectors
11. Idle air valve (1AC valve)
12. Fuel pump relay
13. Exhaust gas recirculation valve (since 1993)
14. Transmission Converter Control Connector (1987-1992). Transmission Wiring Connector (since 1993)
15. Ignition distributor with electronic spark control (EST module) (1987—1992). Ignition distributor with ignition timing control unit (1C-module) (since 1993)
16. Ignition coil
17. Oil pressure alarm sensor
18. Electro-pneumatic distributor (EAD) (1987-1992), air bypass valve (since 1993)
19. Solenoid of the electro-pneumatic valve of the exhaust gas recirculation system
20. Air conditioner pressure drop sensor/switch
21. Fuel pump fuse
1.1 b. Location of exhaust gas toxicity reduction system units on 5.0/5.7 liter V8 engines.
1. Fuel injectors (look at the arrows)
2. Bypass hose
3. Oxygen sensor
4. Coolant temperature switch/sensor
5. Ground connection of the processor unit wires (ECM/PCM)
6. Processor unit coolant temperature sensors (ECM/PCM)
7. Crankcase Ventilation Spool (PCV)
8. Throttle Position Sensor (TPS)
9. Idle air valve (IAC valve)
10. Exhaust gas recirculation valve (look at the arrow)
11. Manifold Absolute Pressure Sensor (MAP sensor)
12. SERVICE ENGINE SOON diagnostic indicator lamp
13. VECI information plate
14. Tank with gasoline vapor absorber
[The text of the article was obtained from the website: chevyman.ru]