Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1989SUBURBAN 1/2 TON 2WD V8-454 7.4LREPAIR AND DIAGNOSISDIAGRAMSCOMPONENTSTEXT DESCRIPTION
1989 Chevrolet Suburban 1/2 Ton 2WD V8-454 7.4L
Text Description
1989 Chevrolet Suburban 1/2 Ton 2WD V8-454 7.4LSECTION Text Description
Air Cleaner Sensor (Six Cylinder): RH Side Of Air Cleaner
Air Cleaner Sensor (V8): LH Side Of Air Cleaner
AIR Diverter Module: RH Side Of Engine
AIR Diverter Valve (Inline Six Cylinder): LH Side Of Engine
AIR Diverter Valve (V6 & V8 RH Side Of Engine
AIR Pump: RH Side Of Engine
ALDL Diagnostic Connector: Under LH Side Of Instrument Panel
Auxiliary Cooling Fan Switch (TBI): RH Side Of Engine
Back-Up Lamp Switch (Automatic Trans.): At Steering Column Gear Selector
Back-Up Lamp Switch (Manual Trans.): LH Side Of Transmission
Bulkhead Connector: LH Rear Of Engine Compartment
Clutch Release Switch: Under LH Side Of Instrument Panel, On Pedal Bracket
Cooling Fan Relay: LH Rear of Engine Compartment
Coolant Temperature Sensor (TBI): Top Front Of Engine, Near Coolant Inlet
Downshift Relay: Rear Of Engine Compartment
Downshift Relay: RH Rear Of Engine Compartment
ECM Module: RH Rear Of Engine Compartment
EFE Valve: LH Side Of Engine
EGR Solenoid: Top Of Engine, Rear Of Carburetor
EGR Valve: Top Of Engine
Electric Air Control Solenoid: RH Side Of Engine
Electronic Control Module: Under RH Side Of Instrument Panel, Behind Glove Box
Engine Exhaust Sender (TBI): LH Rear Of Engine
Engine Function Diagnosis Connector: Under LH Side Of Instrument Panel
Engine Heater: LH Side Of Engine
Engine Temperature Switch: LH Side Of Engine
ESC Module: RH Top Of Engine
Fuel Filter (Inline): RH Frame Side Member
Fuel Injectors: Top Center Of Engine In Throttle Body
Fuel Module: Under LH Side Of Instrument Panel
Fuel Pump Relay: RH Side Of Engine Compartment
Fuel Pump Test Connector: RH Rear Of Engine Compartment
Fuse Panel: Under LH Side Of Instrument Panel
Horn Relay: Under LH Side Of Instrument Panel
Idle Air Control Actuator: RH Top Of Engine
Junction Block: Rear Of Engine Compartment
Knock Sensor (V6): LH Side Of Engine
Knock Sensor (V8): RH Side Of Engine
MAP Sensor: RH Center Of Engine
Neutral Switch (Manual Trans.): Under LH Side Of Instrument Panel
Oil Pressure Sender: LH Rear Of Engine
Oil Pressure Switch (TBI): LH Side Of Engine
Oil Pressure Switch/Sensor: LH Side Of Engine
Oxygen Sensor: RH Rear Of Engine
Oxygen Sensor: LH Rear Of Exhaust Manifold
Relay Assembly (4-Bbl.): RH Side Of Engine Compartment
Temperature Switch (4-Bbl.): RH Side Of Engine
Throttle Position Sensor: On Throttle Body
Throttle Return Valve: LH Side Of Engine
Throttle Valve Relay: LH Front Of Engine
Transmission Converter Clutch Connector: RH Rear Of Engine, Near Transmission
Transmission Downshift Relay: RH Side Of Dash Panel
Transmission Solenoid: LH Side Of Transmission
Transmission Switch: LH Side Of Transmission
Vacuum Release Valve: Under LH Side Of Instrument Panel, On Brake Pedal Bracket
Water Temperature Sensor: LH Side Of Engine
Water Temperature Switch: LH Side Of Engine
Windshield Wiper Motor: LH Rear Of Engine Compartment
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.