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 MANUALSFORD1987BRONCO II 4WD V6-177 2.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSAIR INJECTIONSERVICE AND REPAIR
1987 Ford Bronco II 4WD V6-177 2.9L
Air Injection: Service and Repair
1987 Ford Bronco II 4WD V6-177 2.9LSECTION Service and Repair
AIR INJECTION PUMP, REPLACE
1. Disconnect air inlet and outlet hoses from air pump.
2. Remove drive belt and mounting bolts from pump and remove the pump.
3. Reverse procedure to install.
CHECK VALVE, REPLACE
1. Disconnect air supply valve from hose and, using a 1.25 inch crow-foot wrench, remove check valve.
2. Clean threads on air manifold adapter using a wire brush, then install new check valve.
AIR BYPASS VALVE, REPLACE
1. Disconnect air and vacuum hoses from valve, then remove the valve.
2. Reverse procedure to install.
AIR MANIFOLD, REPLACE
1. Disconnect air supply hose from check valve and position hose aside.
2. Unscrew air manifold to cylinder head coupling nuts until free of the cylinder head, then remove air manifold.
3. Reverse procedure to install.
AIR SUPPLY TUBES, REPLACE
The air supply tubes, or air nozzles, will normally be replaced during cylinder head overhaul, however, they may be replaced without removing the cylinder head by removing the air manifolds and using a hooked tool to pull the tube.
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.