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 MANUALSCHEVROLET1982S10,T10 P/U,BLAZER V6-173 2.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMIXTURE CONTROL SOLENOIDDESCRIPTION AND OPERATION
1982 Chevrolet S10,T10 P/U,Blazer V6-173 2.8L
Mixture Control Solenoid: Description and Operation
1982 Chevrolet S10,T10 P/U,Blazer V6-173 2.8LSECTION Description and Operation
The ECM controls the air/fuel mixture through the MC solenoid ground circuit--actuating the metering rods.
- When the MC solenoid is energized (down position), fuel flow is reduced providing leaner mixtures.
- When the solenoid circuit is open (up position), more fuel is allowed to flow, providing richer mixtures.
The ECM cycles the MC solenoid "ON and OFF" at a fixed rate of 10 times per second.
The air/fuel mixture is adjusted by varying the amount of time the solenoid is energized per cycle--solenoid dwell.
NOTE: Solenoid dwell can be read using most dwell meters. If engine operation changes when a dwell meter is connected to the mixture control solenoid use a different meter. Meters with three leads are more likely to be able to measure solenoid dwell correctly than those with two leads.
RENDER: 1.0x
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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.