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.
1977 MG MidgetFACTORY OEM SERVICE PROCEDURE
Exhaust Gas RECIRCULATION: Testing
- Check condition of all lines and connections. Start and run engine until normal operating temperature is reached. While observing EGR valve, open and close throttle several times.
- The EGR valve should open and close with RPM change, and close immediately when throttle is closed. Using a hand-held vacuum pump, apply vacuum to EGR valve. Valve diaphragm must retain vacuum when open. If not, clean or replace EGR valve as necessary.
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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