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Vacuum Leaks Posted by Bill Homer [Email]  (#3427) [Profile/Gallery]
(more from Bill Homer) on Mon, 5 Sep 2005 07:52:22
In Reply to: Re: Also see this post further down the page, Michael [Profile/Gallery]
, Sun, 4 Sep 2005 11:08:29
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I would say that there is a very good chance that you have a vacuum leak somewhere, probably through a deteriorated vacuum hose. When I bought my 1994 car two years ago, it had a few bad hoses - same car, same age, high probability of the same issue.
As a first step, I would replace ALL the vacuum hoses. The good news is that this is a very easy repair, there are very few hoses on the non-traction control cars like your 1996 CS. Get yourself ten feet of suitable vacuum hose: normal 5/32" rubber hose (about $1/foot) will do or I prefer 3.5mm thick-walled silicon hose available from hosetechniques.com or saabsavior, one of the site sponsors. One at a time, pull off the old hoses from the connections, or cut (slit along the length) the old hose for any stubborn pieces - you do not want to destroy the nipples that the hoses connect to. Cut the new pieces to the length of the old ones, reinsert. The only questionable item is the short hose that goes from the intake manifold to the Manifold Air Pressure (MAP) sensor mounted on the firewall. SAAB claims that this must be a certain kind/length of hose, I had no problem with one cut exactly to the size of the old one (which was deteriorated). Your CS does not have the hose that goes through the firewall to the turbo pressure guage, but on cars that do you can just trim an inch or two if you don't want to dig into the false firewall.
Another likely vacuum leak source is the valve cover breather (PCV) bushing on the rear left of the valve cover - the black ring that the plug inserts into. SAAB sells this bushing for about $9-10, but you can order it from many places for $1. Large autoparts stores may have a suitable substitute. Unplug the breather nipple (one large and one small hose attached), pull out the old swollen/cracked bushing, replace, reinsert the nipple.
If neither of these fixes the problem, check the turbo bypass valve by sucking on the small hose that attaches to the center of it - if it leaks, it's dead.
If none of these work, perhaps you have a gasket leak. Quasimotors.com has a procedure for detecting an intake gasket leak using a propane torch and a piece of rubber hose - I've never had to try this.
posted by 136.182.2...
, Sat, 3 Sep 2005 11:13:17, Sat, 3 Sep 2005 18:39:31, Sat, 3 Sep 2005 21:22:40, Sun, 4 Sep 2005 11:08:29, Mon, 5 Sep 2005 07:52:22 <-- Viewing This Message, Mon, 5 Sep 2005 17:22:05, Mon, 5 Sep 2005 21:21:37
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