Question about 1998 Saab 900
First suggestion would be to have the three engine mounting bushings checked out, these dampen the normal engine vibrations and if they have failed (gone soft, perhaps from contamination by oil, or just age) they don't restrain the engine. Polyurethane is possibly the best replacement.
I'm assuming that there are no other problems with the engine through it's rev range, until you get to that speed? And that the engine otherwise runs smoothly, even after that speed?
The other possibility is imbalance in the axle half shafts. Did you have the wheels balanced on the car? That might balance all the rotating parts.
Let us know.
Posted on Aug 09, 2009
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Posted on Jan 02, 2017
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