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 MANUALSFORD1987ECONOLINE E150, VAN CARGO EXTENDED, 5.0 NREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMCARBURETOR - HOLLEY 4180-C 4-BBLADJUSTMENTCHOKE PULL-DOWN
1987 Ford Econoline E150, Van Cargo Extended, 5.0 N
Choke Pull-Down
1987 Ford Econoline E150, Van Cargo Extended, 5.0 NSECTION Choke Pull-Down
- Place carburetor on a stand which will allow access to pull-down diaphragm vacuum passage on underside of throttle body. See Fig 1. Mark choke cap and choke housing for adjustment reference.
- Using a hacksaw, carefully cut a slot in head of choke cap breakaway screws. Using a screwdriver, remove breakaway screws and conventional screw. Remove retainer, choke cap, and gasket.
- Temporarily install choke cap and gasket. Line up marks made prior to disassembly and rotate cap 90 degrees counterclockwise from this position. Secure choke cap with one screw.
- With choke plate fully closed, actuate choke pull-down diaphragm by applying at least 17 in. Hg of vacuum. Using a drill or gauge, check clearance between lower edge of choke plate and air horn wall.
- If adjustment is required, carefully remove diaphragm adjustment screw cap with a small punch or screwdriver. See Fig 1. Using a 5/46" Allen wrench, turn screw clockwise to decrease clearance and counterclockwise to increase clearance.
- Maintain vacuum applied to diaphragm during adjustment. Cycle vacuum from zero to 17 in. Hg to verify adjustment. When adjustment is correct, apply RTV sealant to adjustment screw cavity and check fast idle cam position.
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.