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 MANUALSCHEVROLET1989STEP VAN P30, 4.8 T, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER M4MEF 4BBLADJUSTMENTSACCELERATOR PUMP
1989 Chevrolet Step Van P30, 4.8 T, Standard
Accelerator Pump
1989 Chevrolet Step Van P30, 4.8 T, StandardSECTION Accelerator Pump
- With accelerator pump rod in specified hole of accelerator pump lever, make sure fast idle cam follower is off fast idle cam. Turn throttle stop screw out until it no longer contacts throttle lever.
- Using a "T" scale, measure distance from top of choke valve wall (next to vent stack) to top of pump stem. To adjust, support accelerator pump lever with screwdriver and bend at notch. See Fig 1.
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.