How do you find a Vacuum Leak?
berniemckean
Joined
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25,919 Posts
The first thing I'd do is connect a vacuum gauge to manifold vacuum. A stock engine at sea level should have about 20" of vacuum at idle. The engine will typically lose about 1" of vacuum for every 1000' above sea level. If your gauge is showing less than those numbers, then start hunting for the leak. I have a vacuum gauge permanently installed on my dash, so I can instantly recognize any vacuum leaks.
As for finding a vacuum leak, spray carb cleaner, unlit propane, or even just soapy water around the intake manifold, carb, and all vacuum hoses and fittings. They all will work. As Jeepfeller mentioned, listen closely for any changes in idle as you are spraying.
Good luck
As for finding a vacuum leak, spray carb cleaner, unlit propane, or even just soapy water around the intake manifold, carb, and all vacuum hoses and fittings. They all will work. As Jeepfeller mentioned, listen closely for any changes in idle as you are spraying.
Good luck
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