Buick Lucerne Problem Report
Buick Lucerne Check Engine Light Due to Intake Manifold Vacuum Leaks
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. - debeone2003
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. - Visitor
When this light comes on after ti has been found to not be a problem and the gas cap is ok what...
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The crankshaft position sensor may fail causing the engine to stall intermittently, the Check E...
never solved problem light still on.since manifold replacement engine oil leak every time the car is turned off