Question about 1996 Oldsmobile Cutlass Ciera

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When car warms up the speedometer goes up and down and transmission shifts funny and the engine cuts off

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If the speedometer suddenly drops back and then returns to being close to your actual speed and the transmission shift or acts up at the same time this is happening then you may have a failing Vehicle Speed Sensor, usually refered to as a VSS. This sensor tells the engine computer, instrument cluster, and transmission controller how fast you are going so the controller can select the proper gear for the transmission to be in. If the speed signal is lost, wrong, or erratic then the transmission may make a quick downshift to to try and match this new, but incorrect, speed and then may make an equally quick upshift to rematch the correct speed once the signal is correct again. This should be an easy one for anyone with a good scan tool to check out as the actual speed reading signal can be observed during a test drive and it's usually pretty easy to spot the glitches. Good luck, hope this helps!

Posted on Jul 30, 2010

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