Buick Lucerne Problem Report

Buick Lucerne Check Engine Light Due to Intake Manifold Vacuum Leaks

(6 reports)

An intake manifold vacuum leak can develop from a variety of sources, often causing illumination of the Check Engine Light with codes P0171 & P0174 stored. Thorough diagnoses will be necessary to pinpoint the cause in order to make the correct repairs. A "smoke" machine is often used to isolate the cause of difficult to find vacuum leaks.

Check Engine light comes on and stays on. Does not flash, just stays steady lit. -
Bought the car used, engine light comes on for loose gas gap. Bought new cap, no change. Bought tool to reset which I do about once a month. -
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