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 Due to Intake Manifold Vacuum Leaks on Pontiac Bonneville
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The intake manifold gaskets can develop external engine oil or coolant leaks. The intake manifo...
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runs very well,but when you shut it of,theres a strong smell of gas,dont see any leaks ?
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.