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.
1989 Ford Bronco II 4WD, Standard, M5OD-R1FACTORY OEM SERVICE PROCEDURE
Electronic EGR Valve
NOTE:
Electronic EGR valve system is controlled by the EEC system. This article covers testing of EGR valve only. See appropriate article in the COMPUTERIZED ENGINE CONTROL section for testing of EVP sensor and Electronic Vacuum Regulator.
- Check vacuum lines for correct routing. Disconnect vacuum hose at valve and connect vacuum gauge to hose. Disconnect connector at EVP on top of EGR valve.
- Start engine and apply 8 in. Hg (27.2 kPa) of vacuum with engine idling. Engine idle should become rough or stall. If idle did not drop, remove valve and check for plugged inlet or outlet ports. Clean ports if they are plugged. Replace valve if inlet or outlet ports are not plugged.
Factory Service Tools
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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.
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