Report: Check Engine Light Due to Intake Manifold Vacuum Leaks
Cadillac Seville Problem
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.
Visitor, 1998 Cadillac Seville, 76,000 mi
engine needs service soon