DIY Video: Air-Cooled Porsche 911 DIY Smoke Test Vacuum Leak Check
Here is a detailed video explaining how to check your Porsche 911’s induction system for vacuum leaks using a smoke tester.
Note: The following information is for educational use only. Before proceeding please read my disclaimer page.
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If you are sorting out the fuel system on your old 911, one of the most important tests you can do is a smoke test to eliminate any vacuum leaks in the system. This is especially important for cars running Bosch CIS K-Jetronic. As we already know, CIS hates vacuum leaks and they are commonly responsible for most running problems on neglected cars. Fortunately this is a test you can do yourself quite easily in less than 30 minutes and will give you instant identification of problem areas.
A decent smoke tester doesn’t cost very much and will serve you well for years to come. Here is a link to a unit similar to the one I own. This is a great skill to have and you can use the same tool for any other cars you wrench on.