idea for testing for vaccum leaks
so I have been attempting to figure out why my rebuild engine idles so damm high, and I have not explored vaccum leaks enough to rule them out as the main cause.
I was talking with a co-worker he gave me an idea on how to thoroughly test for vacuum leaks. It goes something like this. Basically what we were talking about was taking a pvc pipe cap the same size diameter of the turbo compressor inlet, drilling a hole in the pipe end which would allow me to fit and seal a air compressor piece (idk the technical name its just the part at the end of the air hose) then I would attach the pvc pipe cap to the air intake on the turbo and use a air compressor and pressurize the intercooler pipe system all the way to the LIM. I plan on using a regulator @ 7-10psi which I assume is about right considering the turbo can boost higher. At this point a leak would be simple to find because the compressed air would hiss as it leaked out or what ever location. I feel like this may be too simple and Im missing something important/expensive whats up? anyone done this? thoughts? noble peace prize winner ? |
going on over two years without a car...
...man it would be hottness to have a driveable FB again |
That's pretty much how it's done. These guys sell a decent looking unit that's so cheap it almost doesn't make sense to build one yourself:
http://www.turboboostleaktesters.com/servlet/StoreFront I blockoff the turbo with a pvc cap and coupler then I stick an air nozzle into a vacuum line. That works ok too. Spray soapy water on anything you suspect is leaking, it will bubble in in the presence of a leak. |
check the egr valve
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Pressure and soapy water or good old brake clean. Either method works.
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I have done this one every car i have every owned. Make your own from a rubber pvc cap at home depot. put a compressor fitting on the end of it and seal it with some sort of sealer so it dosnt leak. spray down the engine with soapy water and watch for bubbles...
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Yep. This method works great. I just did this a couple weeks ago. Great way to find leaks.
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All you need is a Fogger. You keep the car off. Pressure up the vaccum system with a fogger machine The leaks show themselves, Almost every Mechanic shop has one
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a fogger works but you can get a pvc end cap and install a air valve and chuck on the end from lows for cheap
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great info guys!
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Yep. Or if it's running take a can of something flammable like wd-40 or brake clean and spray the suspected area. It will essentially clog the leak for a second the idle will increase again. We did this often on carb boots for motorcycles. But all other methods mentioned here work well too.
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Originally Posted by notveryhappyjack
(Post 11005069)
great info guys!
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