Cadillac DeVille Problem Report
Cadillac DeVille 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.
Diagnostic scan check - found engine misfire due to Intake Manifold Cracked and Leaking.
No work performed at this time. - MMB1968
Cracked Intake Manifold was causing a misfire. It was Replaced with an Aftermarket Dorman intake. (Least expensive option) - Visitor
check engine light comes on while driving - vandy
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The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.