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
The ECM controls ported vacuum to the EGR valve with a solenoid valve. The ECM uses coolant temperature, throttle position and manifold pressure to control vacuum solenoid operation. During cold engine operation and idle, the solenoid valve is grounded by the ECM. This blocks vacuum to the EGR valve. During warm engine operation and off idle speeds, the solenoid is not grounded and vacuum opens the EGR 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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