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New RPM sensor installed, but 940 stalled again 900

posted by  masupra on  Wed Oct 18 07:31 CST 2006
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I had some stall/non-restart problm last week (http://www.brickboard.com/RWD/index.htm?id=1123545) and I thought it was the RPM sensor. Yesterday, I received the RPM sensor from FCPGroton and installed it. This morning, the car ran fine for my 35 mile commute and I thought the problem was taken care of...until I went out for lunch and car stalled again at 75mph.

The symptom was the same with what I had last week before installing the RPM sensor. The tach needle dropped to dead zero instantly and stayed there even when I was coasting from 70mph to a stop. After pulled over, I was able to start the car right away, without touching anything under the hood.

Now what else should I look at? I searched the board and it seems 'power stage' is another common failure item, but would a failed power stage cause the tach drop to zero when the engine was turning? Is that possible the new RPM sensor is faulty?

Thanks in advance
--
1994 944NA 100K miles






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