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.
Chart C9C - Vacuum Actuated EFE System Check (5.0L)
1987 Pontiac SafariSECTION Chart C9C - Vacuum Actuated EFE System Check (5.0L)
NOTE:
The following step numbers refer to the numbers in the accompanying flow chart(s).
- Engine coolant temperature should be below 105°F (40°C).
- EFE valve should be open above 105°F(40°C).
- There should be at least 10 In. Hg vacuum available to EFE actuator diaphragm.
- Valve may be seized. It may be freed up using Heat Valve Lubricant (1052627). If valve does not free up, replace valve.
RENDER: 1.0x
NO RELATED
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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.