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)BODY & FRAMEVACUUM PUMPS/VACUUM OPERATED ACCESSORIESOVERHAULELECTRIC PUMPSPISTON ASSEMBLY (DISASSEMBLY)
1987 Pontiac Fiero Base, Standard, MG3
Piston Assembly (Disassembly)
1987 Pontiac Fiero Base, Standard, MG3SECTION Piston Assembly (Disassembly)
Uncrimp tabs on bonnet. Pump housing and bonnet must be held together during disassembly due to spring load on bonnet. Remove bonnet and spring. Lift piston assembly out of pump housing. Remove and replace umbrella valve assembly.
RENDER: 1.0x
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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.