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 MANUALSPONTIAC1987GRAND PRIX BROUGHAM, 5.0 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER E4MC/E4MEADJUSTMENTSFLOAT LEVEL (DRY SETTING)
1987 Pontiac Grand Prix Brougham, 5.0 H
Float Level (Dry Setting)
1987 Pontiac Grand Prix Brougham, 5.0 HSECTION Float Level (Dry Setting)
- Remove air horn, feedback solenoid plunger, and air horn gasket. Remove plastic float bowl insert. Hold float bowl retainer firmly in place.
- Push float down lightly against needle. Measure float height from top of casting to top of float at a point 3/16" from end of float. Float level should be within 1/16" of specifications.
- If float level is too high, hold retainer in place and push down on center of float pontoon to obtain correct setting.
- If float level is too low, remove metering rods and feedback solenoid connector screw. Count and record for reassembly the number of turns needed to lightly bottom lean mixture screw.
- Remove feedback solenoid assembly. Bend float upward to adjust. Recheck float level. Reassemble float bowl components. Lightly bottom lean mixture screw, then back out screw to number of turns previously recorded. Reinstall air horn.
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.