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 MANUALSCHEVROLET1986C 10 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEFLUID PRESSURE SENSOR/SWITCHDESCRIPTION AND OPERATION
1986 Chevrolet C 10 P/U 2WD V8-350 5.7L
Fluid Pressure Sensor/Switch: Description and Operation
1986 Chevrolet C 10 P/U 2WD V8-350 5.7LSECTION Description and Operation
Description
A pressure sensitive switch is screwed through the rear face of the valve body assembly into the direct clutch oil passage. This switch is closed (grounded) in all but direct drive and reverse, since there is no oil pressure in this passage in Neutral, First or Second gear. The pressure switch is connected by a wire to a transmission connector and hence through an engine solenoid valve to the distributor and engine thermoswitch. When this circuit is grounded (switch closed), spark advance is retarded.
When the transmission shifts to high gear (or reverse), oil pressure in the direct clutch passage will open the switch and circuit so that the transmission will no longer affect the vacuum advance of the distributor.
Line Pressure Regulator
Regulates line pressure according to pump speed and engine torque.
A pressure sensitive switch is screwed through the rear face of the valve body assembly into the direct clutch oil passage. This switch is closed (grounded) in all but direct drive and reverse, since there is no oil pressure in this passage in Neutral, First or Second gear. The pressure switch is connected by a wire to a transmission connector and hence through an engine solenoid valve to the distributor and engine thermoswitch. When this circuit is grounded (switch closed), spark advance is retarded.
When the transmission shifts to high gear (or reverse), oil pressure in the direct clutch passage will open the switch and circuit so that the transmission will no longer affect the vacuum advance of the distributor.
Line Pressure Regulator
Regulates line pressure according to pump speed and engine torque.
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.