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.
1992 GMC Suburban 1/2 Ton 2WD V8-350 5.7LFACTORY OEM SERVICE PROCEDURE
System Specifications
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
212°F or (100°C) 177 Ohms
158°F or (70°C) 467 Ohms
100°F or (38°C) 1800 Ohms
68°F or (20°C) 3520 Ohms
40°F or (4°C) 7500 Ohms
20°F or (-7°C) 13,500 Ohms
0°F or (-18°C) 25,000 Ohms
-40°F or (-40°C) 100,700 Ohms
IDLE AIR CONTROL (IAC) VALVE
Terminals "A" to "B" 40 to 80 Ohms
Terminals "C" to "D" 40 to 80 Ohms
Terminals "B" to "C" Infinite Ohms
Terminals "A" to "D" Infinite Ohms
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
1,000 to 2,000 Feet 3.6 to 5.2 Volts
2,000 to 3,000 Feet 3.5 to 5.1 Volts
3,000 to 4,000 Feet 3.3 to 5.0 Volts
4,000 to 5,000 Feet 3.2 to 4.8 Volts
5,000 to 6,000 Feet 3.0 to 4.6 Volts
6,000 to 7,000 Feet 2.9 to 4.5 Volts
7,000 to 8,000 Feet 2.8 to 4.3 Volts
8,000 to 9,000 Feet 2.6 to 4.2 Volts
9,000 to 10,000 Feet 2.5 to 4.0 Volts
OXYGEN (O2S) SENSOR
Closed Loop 100 mV (.1 volt) to .999 mV (1.0 volt)
THROTTLE POSITION SENSOR
Idle (normal) .45 to .95 volts.
(maximum) 1.25 volts.
Wide Open Throttle 4.0 to 4.5 volts.
The Throttle position Sensor is not adjustable on this engine but should read below 1.25 volts at closed throttle and about 4.5 volts at wide open throttle.
212°F or (100°C) 177 Ohms
158°F or (70°C) 467 Ohms
100°F or (38°C) 1800 Ohms
68°F or (20°C) 3520 Ohms
40°F or (4°C) 7500 Ohms
20°F or (-7°C) 13,500 Ohms
0°F or (-18°C) 25,000 Ohms
-40°F or (-40°C) 100,700 Ohms
IDLE AIR CONTROL (IAC) VALVE
Terminals "A" to "B" 40 to 80 Ohms
Terminals "C" to "D" 40 to 80 Ohms
Terminals "B" to "C" Infinite Ohms
Terminals "A" to "D" Infinite Ohms
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
1,000 to 2,000 Feet 3.6 to 5.2 Volts
2,000 to 3,000 Feet 3.5 to 5.1 Volts
3,000 to 4,000 Feet 3.3 to 5.0 Volts
4,000 to 5,000 Feet 3.2 to 4.8 Volts
5,000 to 6,000 Feet 3.0 to 4.6 Volts
6,000 to 7,000 Feet 2.9 to 4.5 Volts
7,000 to 8,000 Feet 2.8 to 4.3 Volts
8,000 to 9,000 Feet 2.6 to 4.2 Volts
9,000 to 10,000 Feet 2.5 to 4.0 Volts
OXYGEN (O2S) SENSOR
Closed Loop 100 mV (.1 volt) to .999 mV (1.0 volt)
THROTTLE POSITION SENSOR
Idle (normal) .45 to .95 volts.
(maximum) 1.25 volts.
Wide Open Throttle 4.0 to 4.5 volts.
The Throttle position Sensor is not adjustable on this engine but should read below 1.25 volts at closed throttle and about 4.5 volts at wide open throttle.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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