Another method to check for vacuum leaks
03-05-2005, 01:22 PM
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Three Wheelin'
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Location: Winterville, NC
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Another method to check for vacuum leaks
After repairing every vacuum leak by the 'tried and true' pressure test method, I tried another idea to see if I could verify the fixes.
After fully warming up the car I removed the turbo outlet pipe and plugged the intercooler inlet. A small spraycan with a couple wraps of duct tape fits perfectly.
Then I bumped the starter a couple of times watching my vacuum guage (you have to have a mechanical Vac/boost guage to do this).
I bumped the starter until I drew 10 in/hg vacuum.
Now I watched for leak down. After 2 or 3 min I still had 5 in/hg vac on the system. I'd say I have no vac leaks and great valve sealing to boot.
Perhaps not scientific, but I would say its a quick test to verify a sealed system.
If it wont hold vacuum at all then it is a sign to investigate further.
After fully warming up the car I removed the turbo outlet pipe and plugged the intercooler inlet. A small spraycan with a couple wraps of duct tape fits perfectly.
Then I bumped the starter a couple of times watching my vacuum guage (you have to have a mechanical Vac/boost guage to do this).
I bumped the starter until I drew 10 in/hg vacuum.
Now I watched for leak down. After 2 or 3 min I still had 5 in/hg vac on the system. I'd say I have no vac leaks and great valve sealing to boot.
Perhaps not scientific, but I would say its a quick test to verify a sealed system.
If it wont hold vacuum at all then it is a sign to investigate further.
