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 MANUALSCHEVROLET1987R 30 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESPOSITIONSEGR SIGNAL
1987 Chevrolet R 30 P/U 2WD V8-350 5.7L
EGR Signal
1987 Chevrolet R 30 P/U 2WD V8-350 5.7LSECTION EGR Signal
The SCAN tool monitors only the ECM drive command to the EGR solenoid. On models with Pulse Width Modulated EGR, reading is duty cycle of ECM signal from 0-100 percent. On models with EGR solenoid, "on" or "off" status of solenoid is indicated. Normal reading with engine running at idle should be 0 or off.
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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.