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.
1985 Mazda GLC BaseFACTORY OEM SERVICE PROCEDURE
EGR THERMO Valve
- With engine idling at operating temperature, disconnect vacuum hose from EGR valve. Apply manifold vacuum to EGR valve. Engine should idle rough or stall.
- If engine does not respond as described, remove thermo valve and check operation of valve opening. Valve should start to open at 104°F (40°C) and open completely at 158° (70°C).
Factory Service Tools
Use the Manual With the Right Hardware
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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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