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 MANUALSCHEVROLET1986STEP VAN P30, 6.2 J, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMCARBURETOR - ROCHESTER M4M SERIES 4-BBLADJUSTMENTFAST IDLE CAM POSITION
1986 Chevrolet Step Van P30, 6.2 J, Automatic, 400/M40
Fast Idle Cam Position
1986 Chevrolet Step Van P30, 6.2 J, Automatic, 400/M40SECTION Fast Idle Cam Position
- Attach a rubber band to tang of intermediate choke shaft. See Fig 1. Open throttle and allow choke valve to close. Install choke valve gauge and set to specification. See CHOKE VALVE GAUGE.
- Place fast idle cam follower on second step of fast idle cam against shoulder of highest step. If cam follower does not contact arm, turn fast idle speed screw until it does.
- Bubble in choke valve gauge should be centered. If not, bend tang on fast idle cam until bubble is centered.
NOTE:
Hold choke closed with a rubber band.
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.