Car Problem Reports

Cadillac DeVille Check Engine Light Due to Intake Manifold Vacuum Leaks

Cadillac DeVille Problem
12 Reports
Me Too

Model Years Affected: 1991, 1994, 1995, 1996, 1997, 1998, 1999

Engines Affected: 4.6L V8, 4.9L V8

Average Mileage: 132,940 mi (11,700 mi - 187,000 mi)


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.

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