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Engine Rpm's Varying wildly above 40 MPH without acceleration 850 1994

posted by  Matt P on  Wed Aug 20 14:57 CST 2003
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I have a 94 850 Turbo with 117K miles. I was driving about 55 miles per hour, I let go of the accleration, and just let it move at the same speed. The RPMs went down to 1500, and then quickly back to 2000, and then back down to 1500 again - in the process speed dropped. When I accelerated back to 55 the acceleration was not smooth and constant.

Normally without acceleration the RPM would stay at 2000 at 55 MPH, and remain there with at a constant speed.

The other day, when I was driving at 40 miles per hour, the rpm swung wildly from 1500 to 2500, and then to 2000. I was feeling my car lurching - slower, faster, slower. The car couldn't decide what gear to stay in.

Any ideas what could be causing this? The strange thing is that there are no lights that came on at all. I assume that means that there are no codes stored to explain what is going on.






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