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1997 Mercury Sable Jolts forward under 10mph

Tiny
DREAMBORN
  • MEMBER
  • 1997 MERCURY SABLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 79,000 MILES
My 1997 Mercury Sable will jolt forward under 10mph only if I'm going downhill. It won't do it if I'm applying gas or brake, only if I let it coast and it does it consistently. It won't do it at any other speeds, or uphill. Please help!

Check engine light is not on.
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Monday, April 20th, 2009 AT 9:58 AM

4 Replies

Tiny
JGAROFALO
  • MECHANIC
  • 489 POSTS
The PCM is trying to shift into 2nd, but the speed is right on the edge of the programming, and it is most likely hunting between 1st and 2nd gears.
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Monday, April 20th, 2009 AT 5:42 PM
Tiny
DREAMBORN
  • MEMBER
  • 2 POSTS
Powertrain Control Module?

Is there anyway to make certain of this? It's a $200 part.
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Tuesday, April 21st, 2009 AT 7:07 AM
Tiny
JGAROFALO
  • MECHANIC
  • 489 POSTS
Replacing the part would not cure the problem necessarily. It would be a matter of programming. This may be just a small "bug" in the original programming of the PCM.
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Tuesday, April 21st, 2009 AT 2:11 PM
Tiny
DREAMBORN
  • MEMBER
  • 2 POSTS
Ok. I want to cringe when I think about bringing it to a Ford/Mercury Dealer scares me. But I will have it looked into. Thank you
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Tuesday, April 21st, 2009 AT 3:09 PM

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