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 Control Valves: Notes
Increased EGR flow, required to meet emission standards, adversely affects driveability. To overcome this problem, the valve is controlled by carburetor vacuum, which is governed by throttle openings. The EGR system increases EGR flow during high load operations and decreases EGR flow during low load operations. Vacuum level at idle and wide open throttle is low and no EGR operation occurs in these modes. Two EGR valve combinations are used to accomplish this:
NO RELATED
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.