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 MANUALSCHEVROLET1987CAVALIER BASE, 4D SEDAN, STANDARD, MR3REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR SYSTEM - GASOLINECOMPONENT TESTINGPULSE WIDTH MODULATED EGR VALVE
1987 Chevrolet Cavalier Base, 4D Sedan, Standard, MR3
Pulse Width Modulated EGR Valve
1987 Chevrolet Cavalier Base, 4D Sedan, Standard, MR3SECTION Pulse Width Modulated EGR Valve
For testing of Pulse Width Modulated EGR system and valve, see appropriate diagnostic chart in COMPUTER COMMAND CONTROL article.
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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.