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.
Idle Speed & Mixture: Buick
Disconnect vacuum hose at distributor and plug hose (to prevent vacuum switch operation and resultant distributor advance). Adjust throttle stopscrew for correct hot engine idle (see Specifications ), adjust both idle mixture screws for highest engine RPM, then readjust throttle stopscrew for 20 RPM higher than the specified idle speed, finally turn each idle mixture screw in (to lean mixture) until engine speed drops off 10 RPM (total of 20 RPM for both screws) so that engine speed is at specified RPM.
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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.