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I upgraded to 3.5mm ID silicone vacuum hoses for My 1998 900SET. The 3.5mm hose has thicker sidewalls than the 4mm hose and will fit stretch a bit to the trottle body nipples. I know Saab owners who have used the 4mm silicone tubing with no issues also.
On the 1997 and 1998 900SET, 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 Boost Pressure Valve aka diverter 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 valve points toward throotle 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. (On the 1997 and 1998 900SET I worked on, this hose was supplied by the factory as silicone rubber and did not have to be replaced.)
Replacement was simply 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 to route 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. I didn't replace these.
There is some concern that since silicone can swell when in contact with engine oil and gasoline, that some uses could lead to failure of the silicone hose. I have not had any problems in the nearly 4 years since I did mine, even with the PVC hoses. I also replaced all the headlight/windshield washer hose with 4mm ID silicone tubing as well.
posted by 208.49.241...
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