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 MANUALSFORD1985MUSTANG LX, 2D HATCHBACK, 5.0 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR FUNCTION TESTINGEGR VALVEPORTED EGR VALVE
1985 Ford Mustang LX, 2D Hatchback, 5.0 F
Ported EGR Valve
1985 Ford Mustang LX, 2D Hatchback, 5.0 FSECTION Ported EGR Valve
- Check vacuum lines for correct routing. Disconnect vacuum hose at EGR valve and plug hose. Disconnect idle air by-pass valve (EFI only).
- Connect vacuum pump to EGR valve. Start engine. Apply 6-10 in. Hg to valve and hold. Engine speed should drop at least 100 RPM or stall. Vacuum should not drop more than 1 in. Hg in 30 seconds.
- Reconnect idle air by-pass valve (EFI only). Reconnect EGR vacuum hose. If system does not respond as indicated, test EGR control system. If testing is required, see appropriate COMPONENT TESTING article in the EMISSION section.
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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.