Cigar smoke test for vcacuum leaks, where is it exlained
#1
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Thinking I have a vacuum leak and want to do a cigar smoke test. I've done several searches for cigar smoke test and although I have found reference to it,.....I have yet to find the actual procedure.
Can Someone point me to it?
Brian In San Antonio
Can Someone point me to it?
Brian In San Antonio
Last edited by bcolins; 02-20-2020 at 01:10 PM.
#2
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Smoke testing is usually done on closed systems under pressure, so you can see the smoke coming out of leaks.
Being careful to have a fire extinguisher on hand, I just use a can of carb cleaner or WD-40 to spray likely points where vacuum might leak. If the engine idle speed increases, that's usually a place where air is hissing through and into the intake system. DO NOT use this method if you have open sparks in the engine bay. DO NOT do this inside a garage. Use common sense.
Here are some articles on the subject that came up with a quick search:
Make vacuum leaks hiss-tory
How to Find a Vaccum Leak
Popular Mechanics article
Good luck,
Scott
Being careful to have a fire extinguisher on hand, I just use a can of carb cleaner or WD-40 to spray likely points where vacuum might leak. If the engine idle speed increases, that's usually a place where air is hissing through and into the intake system. DO NOT use this method if you have open sparks in the engine bay. DO NOT do this inside a garage. Use common sense.
Here are some articles on the subject that came up with a quick search:
Make vacuum leaks hiss-tory
How to Find a Vaccum Leak
Popular Mechanics article
Good luck,
Scott
#3
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Unhook the intake at the throttle body (or maybe unhook at the maf, the smoke might be bad for the maf not sure) Be prepared to block the intake hose with something (I’ve used a rubber glove and rubber band) Take the small rubber cap off the port located on the intake, attach a small rubber hose to the port. Light cigar, blow smoke into the intake via the rubber hose until it’s filled. Block the intake hose now with your glove or whatever. Keep blowing smoke into the rubber hose until you see smoke coming out of your leak. You could probably blow compressed air in at a real low psi too
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yaakov
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07-20-2013 08:58 PM