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 MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC TBI TESTS W/CODESDIAGNOSTIC CHARTSEGR SYSTEM CHECK (2.8/7.4/5.7L OVER 8500 GVW)TEST DESCRIPTION
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Test Description
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Test Description
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- With ignition on (engine off), the solenoid should not be energized and vacuum should not flow to EGR valve.
- Grounding the diagnostic terminal will energize the solenoid and allow vacuum to flow to the EGR valve.
- Checks for plugged EGR passages. If passages are plugged, the engine may have severe detonation upon acceleration.
- The EGR solenoid will not be energized in Park or Neutral. This test will determine if the P/N switch input is being received by the ECM.
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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.