Check Engine Light Due to Intake Manifold Vacuum Leaks on Cadillac Eldorado

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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Average mileage: 149,500 (119,000–180,000)
Engine affected: 4.6L V8
10 model years affected: 1993, 1994, 1995, 1996, more1997, 1998, 1999, 2000, 2001, 2002
12 people reported this problem
1 person shared problem details
leak in intake manifold
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