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Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007 Forum for discussion of the Ford Taurus, Mercury Sable and Ford Taurus SHO. Covers vehicle years: 1986-2007

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Old 09-03-2008, 12:28   #1 (permalink)
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highway rmp problem

98 ford taurus RPM problem on freeway?

Ask this question for my daughter who was driving to KU from wichita yesterday. her car has 103,000 miles on it. here is what happened.

Above 60 MPH, it jerks and the rpms go down about 250 and then go right back up. Turning cruise on or off didn't seem to help. Turning the AC off made it better...just dipped rpms going downhill.

no od light, thinking it might be an od problem anyway.

thanks
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Old 09-04-2008, 09:08   #2 (permalink)
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Re: highway rmp problem

That is the Torque Converter locking and unlocking. And is completely 'normal'. Unfortunately it leads to premature wear of the clutch and reduces fuel mileage. The only way to get rid of it is to turn the AC off (floor or vent) or to get the PCM reflashed with an aftermarket PCM programmer.
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