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Do you notice a drop in idle speed with the vacuum leak
Posted by Wingerr (more from Wingerr) on Wed, 27 Apr 2005 14:14:39
In Reply to: Finding Vacuum Leak With Propane, Toby, Wed, 27 Apr 2005 11:11:10
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When you disconnected the vacuum hose to introduce the vacuum leak, did you notice the idle drop?
This method presumes that your leak causes the engine to run on the lean side; when you pass your propane source over the area of the leak, it will enrich the mixture, and the engine speed will rise.
However, if your engine is already running rich, adding propane won't increase the idle, and may even decrease it, if you add too much. You may just have to introduce a even bigger vacuum leak to make sure you're running lean, if you want to experiment.
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