Vacuum Test

[87CandyBlueT]

My first question is how do I check for vacuum. What lines do I connect the vac. gauge to and do I do this while the car is running, cranking? Engine warm or cold etc. Trying to find out if I have a leak somewhere that could be causing my idle problem. Any help/ pictures of the lines to use would be great Thanks. Does it require me to use an Air compressor with the gauge I have?

 

[87CandyBlueT]

Anyone?

 

[inline6]

well for a gauge, you usually just T into a vacuum line and check it with the motor running at idle, i think.

It will read close to 0 with a leak and probly from 14-18 inHG if its good.

 

[Nick M]

Your reading will vary with altitude. 20-22 inches near sea level. 16-17 inches in Denver.

What is your idle doing?

 

[SPD TRP]

I'm in Houston and it reads almost 23 inches of vacuum.

Wayne

 

[koulee]

The vac line that I attached the gauge to was the brake booster vac line, and you will want to test it on a warm engine.

For more info about the readings you are getting: http://www.cygnusx1.net/Supra/TechTips/vacuum_gauge_readings.aspx