Quote:
Originally Posted by Starter986
Got one. Don't know how to use it. Yet. Think II'll spend some time this weekend testing it... learning how to use it. Learning in a pinch, car down, no bueno.
Blue, Thank you.
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For a basic vacuum test:
Make sure the car is fully warmed up...
Best to take it for a 15 -20 drive..that way it is fully warmed up and things that use vacuum to function like the EVAP System have done there system checks.
Then hook up the vacuum gauge start the car and just let it idle.
Do not rev the engine just let it idle ...
Hold the gauge in you hand do not set it on the engine or car body.
There is a spring attached to a counter weight inside the gauge.
Vibrations set up harmonic oscillations in the spring causing the needle to move or quiver giving false readings.
On an engine in good condition your looking for a reading18-22 inches of mercury At sea level
With a rock solid needle.
If your at high elevation like say Denver Co. you have to adjust your readings.
You have to add 1 inch of Mercury for ever thousand feet above sea level to the needle reading.