recommended vacuum test - Saab 900 Bulletin Board - Saabnet.com
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recommended vacuum test
Posted by Monster (more from Monster) on Wed, 15 May 2002 09:41:33
In Reply to: Thanks AP-Loose Ignition Coil Connector, JohnE 92s, Tue, 14 May 2002 22:30:15
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Hi, John
Something I highly recommend you buy or borrow is a handheld vacuum pump tester. You can find them at places like Pep Boys or NAPA, and maybe even department stores like WalMart or K-Mart. The one I have is called a Silverline MityVac, and I got it years ago from a J. C. Whitney catalog. They run around $25 to $35, but I have seen cheap ones for under $20.
The device is basically a little hand pump you can squeeze, and it has a gauge on top with a little release valve. What you can do with it is hook it up to each of the vacuum lines coming out of your intake manifold, and then pump vacuum onto the lines one at a time and see if any of them leak. They should all hold vacuum. If you find one that doesn't, you need to find out why... usually it's a split or disconnected hose, but it can also be that the device on the end is faulty, such as a ruptured diaphram in a hooter valve or charcoal cannister. In that case, you need to buy a new part.
I honestly think those little MityVac pumps are an essential part of any Saab Do-It-Yourselfer. They'll save you tons of money having mechanics do diagnostic work for you! I'd wager more than half the time that poor running problems in C900s are vacuum problems.
- = M = -
posted by 208.63.202...
Posts in this Thread:
- What the heck is happening to my engine???Please help., JohnE 92s, Tue, 14 May 2002 18:33:13
- Thanks AP-Loose Ignition Coil Connector, JohnE 92s, Tue, 14 May 2002 22:30:15
- first ,whats a 92s?check your throtle switch if efi.n/m, mudpuppy, Tue, 14 May 2002 18:43:31
- Re: What the heck is happening to my engine???Please help., AP, Tue, 14 May 2002 18:39:55
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