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.
3) Ported Vacuum Advance with Exhaust Gas Recirculation (PVA/EGR)
Used on all 6 cylinder engines with automatic transmission.
Function of all three systems is to eliminate distributor vacuum advance when driving in low speeds. Although component usage varies between vehicles, their operation is basically the same. Distributor vacuum advance is governed by a distributor vacuum solenoid or CEC solenoid. On ported vacuum advance applications, a ported vacuum line directly from carburetor to vacuum advance unit allows retarded vacuum advance at idle or closed throttle.
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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.