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.
EGR System: Operation: Notes
On non-turbocharged engines, amount of exhaust gas recirculation is controlled by ported vacuum and exhaust gas pressure. The EGR valve should be closed when any one of the following conditions is met: sudden acceleration, sudden deceleration, closed throttle deceleration, idle, radiator coolant below 63°F (17°C), engine coolant below 158°F (70°C) or engine speed below 1500 RPM.
On turbocharged engines, amount of exhaust gas recirculation is controlled by engine conditions. The EGR valve will be half closed during sudden acceleration. The EGR valve will be fully closed when any one of the following conditions is met: throttle plate is closed, sudden deceleration, radiator coolant below 63°F (17°C) or engine coolant below 104°F (40°C).
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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