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Here is what you need to do
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Posted by fieldsc [Email] (more from fieldsc) on Sun, 19 Nov 2006 12:20:56 Share Post by Email
In Reply to: Flat performance,no pleasing 2200rpm torque,poor econ ., Dan N, Sun, 19 Nov 2006 11:43:22
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Heres what you need to do to test it. Unplug the middle vacuum hose on the BPC (sits on the top right side of the radiator, it has 3 vacuum hoses, and an electrical connector going to it). What this will do is take away the ECU's ability to tell the wastegate when to open/close. It will always be closed now, and it will boost very fast until fuel cutoff if the car is healthy.

If you get fuel cutoff (you'll know it when it happens it'll be a sudden jerk followed by loss of power for about a second), you more then likely have a faulty BPC valve, they do break and get gummed up. You can search the forums for fixes, but they dont usually last. Some saab scrap yards sell them used with a 1 year warranty, for much less then a new bpc costs.

If the car doesn't boost wildly its one of two things, you have a major boost leak, or the waste gate arm is disconnected. Start by looking at all of the vacuum hoses, everything should be smooth, with no surface cracks, no matter how small. The cracks will open up on boost. Better yet just replace all the hoses, 5mm ID for the lines going to the BPC, and 3.5mm ID for all other hoses.

Next look at the wastegate arm (when the engine is cold, even turning the car on for 5 seconds will heat the turbo up too much), what happens is a little clip that holds the arm to the actuator rusts out causing the arm to fall off. Check this by looking underneeth the car, it will be in the middle about 12-16" from the front grill. Having someone shine a light from above on the turbo will help locating it. This can be fixxed by either threading some wire in the hole that the clip was in, or using a E clip (looks like a washer except it has 3 teeth and an opening to slide it over the post). When the clip in my car rusted out, the hole was filled in, so I just went to the store and bought a handful of E-clips and figured out what fit from there. They look like this http://www2.gpmd.com/image/d/dtxc7630.jpg

Be sure to plug the middle (waste gate) hose back in after you test it, its not healthy for the transmission to be hitting fuel cut all the time.


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