Re: 90 SPG, low boost-high miles - Saab 900 Bulletin Board - Saabnet.com
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Re: 90 SPG, low boost-high miles
Posted by aalto (more from aalto) on Sat, 25 Sep 2004 12:01:20
In Reply to: 90 SPG, low boost-high miles, VIGGENIT, Sat, 25 Sep 2004 10:42:08
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If the car makes a some boost then it's probably OK. Both of my turbos came to me not making full boost. On the 89T (2/3 into the yellow) it was a matter of adjusting the wastegate acuator and fixing a few broken vacuum lines. On the 88T (1/3 into the yellow) it turned out to be a bad vacuum advance module and incorrectly set timing. The total cost to put all of this right on both cars was around $30 and a few hours of my time. Both cars now boost to the end of the yellow zone.
The other common low-boost culprits are broken, or stuck swtiches at the brake and clutch pedals which keep the car at base boost. Easy fixes as well.
The actual turbos are very robust and usually continue to make good boost even with failing oil seals and bearings.
posted by 24.85.7...
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