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 MANUALSFORD1991TAURUS L, 4D SEDAN, 3.8 4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR FUNCTION TESTINGEGR VALVE TESTINGPORTED EGR VALVE
1991 Ford Taurus L, 4D Sedan, 3.8 4
Ported EGR Valve
1991 Ford Taurus L, 4D Sedan, 3.8 4SECTION Ported EGR Valve
- Check vacuum hoses for correct routing. Connect a vacuum gauge directly to EGR vacuum source. With engine running, open and close throttle quickly to at least 1/2 open position. If gauge reading indicates vacuum, EGR vacuum supply is okay and vacuum port is open.
- If gauge reading indicates no vacuum, EGR vacuum port is plugged or restricted and should be cleaned. Disconnect vacuum hose at EGR valve, and plug hose. Connect a hand-held vacuum pump to EGR valve.
- Start engine. Apply 6-10 in. Hg to EGR valve. Engine speed should drop at least 100 RPM or stall. Vacuum should not drop more than 1 in. Hg in 30 seconds. Reconnect EGR vacuum hose.
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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.