1994-2002 [Subscribe to Daily Digest] |
The vacuum hoses on the NG900 and 9-3 2.0L turbo engine are 4mm inside diameter (5/32"). I used the 3.5mm silicone hose from http://www.hosetechniques.com as it has a thicker wall to resist boost pressure better. Either way you will need about 15 feet of vacuum hose. Actually you only need about 10 feet, but having a little extra is a good thing if you make any mistakes in cutting the hose to the correct length. Besides, most of the headlight washer and windshield washer hoses are also 4mm inside diameter, so you will probably have a use for the extra hose eventually.
On the 1997 and 1998 900SET, (and the 99 9-3 I believe) there are 4 vacuum hoses that connect to the throttle body. You will need to remove the plastic engine cover to access these hoses. There should be a diagram of the vacuum hoses on an emissions label in the engine compartment of the vehicle.
*One hose goes from the throttle body to the turbo By-Pass Valve (BPV) located between the battery and the radiator.
*One hose goes from the throttle body to the fuel pressure regulator located on the fuel injector rail.
*One hose goes from the throttle body to a one-way valve (arrow on one-way valve points toward throttle body) and then to the Positive Crankcase Ventilation (PCV) fitting on the engine valve cover.
*One hose goes from the throttle body to the Manifold Absolute Pressure (MAP) sensor located on the strut tower brace.
Replacement should simply be a matter of removing a stock vacuum hose, cutting a piece of the new hose the same length as the stock hose, and installing the new hose. In reality, the old hose will probably break when you try to remove it. You will probably have to carefully cut the broken piece of hose of the nipple while trying to not cut anything else. You will need needle nose pliers and patience to remove the old hose and route the new hoses properly. A little soapy water or saliva on the ends of the new hoses makes them easier to install on the nipples. Some plastic cable ties would be handy when routing the vacuum hose from the throttle body to the BPV.
There are some additional vacuum hoses that go to the evaporative fuel/charcoal canister system, but since they are not routed across the engine they don't deteriorate as fast.
Now is also a good time to squirt some quality lubricant on the throttle body cable and linkage, as well as tighten the hose clamps on all the coolant hoses.
REM in Seattle
2005 Saab 9-3 Aero Convertible; 5-speed; 2000 miles
1998 Saab 900SET; 5-door; Automatic; 75,000 miles
1984 Saab 900T; 3-door; 5-speed; 242,000 miles (RIP)
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
