This means the engine is producing less power and, therefore, less vacuum. The gauge above shows an extremely low reading, which holds fairly steady. *** Steady Low/Extremely Low (Image/OnAllCylinders) You can also expect the readings to be lower for more aggressive cams. For every 1,000 feet above sea level, you can expect the reading to be about one inch lower. Higher elevations may cause slightly lower readings. Keep in mind, this reading is ideal for stock-cammed engines running at sea level. This a normal reading-between 17 and 22 inches of mercury. *** Normal Vacuum Gauge Reading (Image/OnAllCylinders) Below are some of the most common readings and diagnoses you’ll find: Once you’re engine is up to operating temperature, you can begin reading your vacuum gauge. Check to make sure all vacuum hoses are connected and not leaking. You can hook a tee-fitting into an existing vacuum source or pull a line, such as one that leads to your transmission. To get started you’ll need to hook your vacuum gauge to an intake manifold vacuum source. We’ve seen this topic covered before, but it’s information worth repeating, keeping-and even bookmarking. We’ve put together this quick-guide to reading your vacuum gauge to help you identify potential mechanical or tuning issues more quickly. The key is understanding what your gauge is trying to tell you. A vacuum gauge is an invaluable resource for tracking down engine issues.
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