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 MANUALSCHEVROLET1986CHEVY VAN G20, 5.0 H, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMCARBURETOR - ROCHESTER E4ME & E4MED 4-BBLTESTINGELECTRIC CHOKE
1986 Chevrolet Chevy Van G20, 5.0 H, Standard
Electric Choke
1986 Chevrolet Chevy Van G20, 5.0 H, StandardSECTION Electric Choke
NOTE:
Preferred air temperature for this test procedure is 60-80°F (15-27°C).
- Engine must be cool so that choke plate is closed when throttle is partially opened. Start engine and time the interval required for choke plate to reach full open position. If choke plate does not fully open within 3-1/2 minutes, proceed with test.
- With engine running, check voltage at choke heater connection. If voltage is over 12 volts, replace electric choke unit. If voltage is low or zero, check wiring harness and repair as necessary.
- Choke unit power supply is through the oil pressure switch. Ensure switch circuitry is good. If procedure in step 2 does not correct the problem, replace oil pressure switch.
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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.