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The reason that works is that vacuum leaks are places where the vacuum system is open and drawing in air unmetered, causing the system to have a different fuel/air mixture than the computer expects. When you get the propane near an opening in the vacuum system, it sucks in the propane and it changes the mixture again. Thanks, I ll give that a try but I m not not altogether hopeful. It s an elaborate vacuum system, with much of it very difficult to get to. Still, it s well worth a shot. John Gardeniers Mar 8 11 at 4:32 How safe is this? That is, how safe is it to have propane near a running engine? Or, alternatively, how can I make this as safe as possible? Don Mar 25 11 at 17:28 Smoke and propane both work well. Another option is a rubber hose stethoscope. This isolates the noise to the end of the hose, and will make a vacuum leak hiss fairly loudly. If you have a stethoscope with the metal rod that you use for putting on the engine block, just yank the rod part out of the hose and viola! You have a new tool. You may be able to squeeze the hose into some places without dismantling as much stuff. Smoke, propane, stethoscope, and carb cleaner all work well. The last option is highly flammable and much more dangerous than propane because it sits and accumulates on the engine. It doesnt evaporate all that quickly, either. Its a very effective way to check a particular spot, to see if your hunch is right, but its essential that you have a good fire extinguisher right nearby if you want to go down that route. Ive used soapy water with some measure of success in the past. Just put some dishwashing liquid and water in a spray bottle and spray each section of each hose. Keep your eyes open. required, but never shown This is a collaboratively edited question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. Its 100% free, no registration required. Got a question about the site itself? meta is the place to talk about things like what questions are appropriate, what tags we should use, etc. Intermittently fluctuating/non-functioning speedometer in Volvo 9 Possible causes? Is it even possible to buy gasoline anymore that does not contain ethanol in the US? Is it possible to use biodiesel in a BMW 335d if I remove the DPF and remap the ECU? possible alternator-battery mismatch if I replace the existing battery with a much higher CCA one? Is it possible or practical to repair a turn signal cancel switch instead of replacing it? How much vacuum should be present in a 2 stroke intake manifold? The windshield are blurry, possible because of oils I have a possible vacuum leak on my car. I thought that on most or all BMWs when you remove the dipstick or oil filler cap while running, the idle will drop or the engine runs rough. Is this true on a 95 M50? My idle does not seem to drop. I am trying to track down what I believe are vacuum leaks. After all the car is 10 years old and the PO records did not indicate any repairs in this area. I found the larger hose that connects to the valve cover had a leak. Fixed that and no change in idle.