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.
Exhaust Gas RECIRCULATION: Operation
The EGR valve, mounted on the exhaust manifold, controls the flow of exhaust gases from the exhaust manifold to the intake manifold. The vacuum signal which controls the EGR valve is taken from a throttle edge tapping which gives no recirculation at idle speed or at full throttle, but gives a varying amount of recirculation between these two extremes depending on vacuum signal and metering profile of the valve. A fuel trap is installed in the vacuum line to the EGR valve to prevent liquid fuel from entering the valve.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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