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post #1 of 4 (permalink) Old 04-16-09, 04:53 AM Thread Starter
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Question Need Help Determining Tranny Problem 98 Sable

Hello,

It has been a long time I've posted in here...this concerns my daughter's 98 Mercury Sable V6 3.0 L with a tranny issue.

When she was driving yesterday, the car revved up and she realized she was not propelling forward.

She was able to put it in 1st gear and got it into a parking lot.

She had the car towed to a shop, I asked her to ask the mechanic to see if the VSS (Vehicle Speed Sensor) went bad. They said it did but that replacing it would not fix the problem with the transmission not going into Drive or OverDrive.

The shop towed it to a transmission shop and the transmission shop indicated the transmission is bad.

Last week she had the check engine light on and had the code read. The code indicated a problem with the TPS (Throttle position sensor). Shortly afterward, the check engine light extinguished and she didn't worry about it because the light extinguished.

So to sum up, here's my question:

Could the TPS and/or VSS cause the transmission NOT to go into Drive or Overdrive but operate in 1st and Reverse?

Thanks,

Chris
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post #2 of 4 (permalink) Old 04-16-09, 07:16 AM
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Re: Need Help Determining Tranny Problem 98 Sable

The TPS can cause several different symptoms. Most of the time it will allow the engine to run erratic at speed and RPM will jump all over the place making it seem as if the transmission downshifted one or two gears. I'm not to versed in the operation of the VSS, but I'd replace both sensors, have a transmission service done and hope for the best.

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post #3 of 4 (permalink) Old 04-16-09, 10:27 PM Thread Starter
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Re: Need Help Determining Tranny Problem 98 Sable

Thank you very much, this validated what my plan of action should be and hope for the best! I'll be sure to post the results when completed. Thanks so much!

Chris
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post #4 of 4 (permalink) Old 04-17-09, 06:41 PM Thread Starter
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Re: Need Help Determining Tranny Problem 98 Sable

I replaced the parts and unfortunately it did not help. Thanks for your help anyway :)
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