How to check for vacuum leaks, What are the tips and tricks ? Options

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From the last time I tried with the engine running and spraying carb cleaner everywhere and causing a big mess. I did not really see a big RPM difference, maybe I was doing it wrong, maybe I was expecting too big a change and moved on too quickly, but nothing really came from it. I still suffer from a periodic hi idle (1500 rpm), sometimes it idles fine at 800. If it was a vacuum leak why did it correct itself and sometimes idle at 800 ? I have since removed the AAR and even swapped out the MPS with another one, no difference. Stock 1.7 FI

So the discussion for today is what is the proper method, tips and tricks to perform a good vacuum leak check.

I am tempted to make a DIY homemade smoke machine from watching youtube to blow smoke in my FI system and check it that way ??

Thoughts (IMG:style_emoticons/default/popcorn[1].gif) (IMG:style_emoticons/default/popcorn[1].gif)

[a few loose screws]

As far as the combustible methods go, personally I'd go with the unlit propane torch. You could also try another way, and that is to use your ears. I'm not being being a smart ass. I know its almost impossible to get your head in to even a spacious engine bay. Use a length of rubber hose, hold one end to your ear and probe around all the usual places where vacuum leaks occur. You can feed the hose right in to the tightest spots too. The nice thing about this is you can cup your hand over vacuum fittings, lines, mating areas on intakes, or carb bodies, if you have carbs, and amplify the sound of even a small leak. Once found, use your fingers to bock the leak. Now you know exactly where your leak is.