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 MANUALSCHEVROLET1988STEP VAN P20, 6.2 J, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMCARBURETOR - ROCHESTER M4ME & M4MEF 4-BBLOVERHAULCLEANING & INSPECTION
1988 Chevrolet Step Van P20, 6.2 J, Standard
Cleaning & Inspection
1988 Chevrolet Step Van P20, 6.2 J, StandardSECTION Cleaning & Inspection
- Clean all metal carburetor parts in standard carburetor cleaning solvent. DO NOT soak any rubber or plastic parts, solenoids, pump plunger, pump stem seal, etc., in solvent as they will swell, harden or distort.
- Plastic cam on air valve shaft and bushing in fuel bowl may be cleaned in carburetor cleaner. Rinse thoroughly after cleaning.
- Thoroughly clean all metal parts and blow dry with shop air. Make sure all passages and metering parts are free of burrs and dirt.
- DO NOT use drills or wire to clean jets.
- Power valve piston bore in float bowl may be cleaned with a .375" soft-wire brush. Turn brush clockwise through full length of bore, plus several more turns to remove dirt and varnish.
- Inspect carburetor surfaces for damage. Inspect holes in levers for excessive wear or out-of-round condition. Replace levers, if worn. Inspect plastic parts for cracks, damage, etc.
NOTE:
The letters "MW" on float bowl, if present, indicate a Machined Pump Well. If replacement of float bowl is required, new float bowl must also display these letters.
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.