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 MANUALSPONTIAC1987FIERO BASE, STANDARD, MG3REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISV6/V8 PFI COMPONENT TESTCHART C7 - EGR VALVE CHECK (2.8L)DIAGNOSTIC AIDS

1987 Pontiac Fiero Base, Standard, MG3

Diagnostic Aids

1987 Pontiac Fiero Base, Standard, MG3SECTION Diagnostic Aids

The EGR position voltage can be used to determine that the pintle is moving. When no EGR is commanded (0% duty cycle), the position sensor should read between .5-1.5 volts and increase with the commanded EGR duty cycle.

Fig 1: Flow Chart C7, EGR Valve Check (2.8L)

RENDER: 1.0x

NO RELATED

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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.