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 DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMALFUNCTION INDICATOR LAMPDESCRIPTION AND OPERATION
1986 Chevrolet C 10 P/U 2WD V8-350 5.7L
Malfunction Indicator Lamp: Description and Operation
1986 Chevrolet C 10 P/U 2WD V8-350 5.7LSECTION Description and Operation
The instrument panel mounted ``Check Engine'' lamp is used to alert the operator of malfunctions within the C3 system. When the ignition is on with the engine stopped, the lamp is illuminated as a bulb check. When the engine is running, the lamp will be illuminated whenever the ECM senses a system malfunction. In addition, the lamp is used to access trouble codes stored in the ECM trouble code memory.
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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.