Quote:
Originally Posted by blue62
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.
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Thank you, Blue!
I'm 3250 above sea level. Also, I haven't used the gauge... so... newbie question here and without reading the instructions (device is in the shed, i'm preparing for a short shift/pt gig, not handy right n ow) to where am I hooking up the gauge respective to the car? I'm going too be doing some PM this afternoon or tomorrow morning (before it gets too hot). I'll be giving the gauge a run.
Cheers!
Thanks!!!