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.
1985 Buick Skylark Custom, 2.8 W, StandardFACTORY OEM SERVICE PROCEDURE
Deceleration Valve
- Remove air cleaner, plug air cleaner vacuum source and connect tachometer to engine. With engine running at idle, remove deceleration valve signal hose from intake manifold.
- Reconnect signal hose and listen for air flow through ventilation pipe and into deceleration valve. Engine speed should drop when hose is reconnected.
- If air flow lasts less than 1 second or engine speed does not drop, check for defective hoses or deceleration valve.
Factory Service Tools
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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