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I have a 2001 Mercury Sable with the Duratech 24 valve

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Hi, I have a 2001...
Hi, I have a 2001 Mercury Sable with the Duratech 24 valve engine in it . The car now has 318,000 miles on it. It's never given me any trouble until the last few days. I had trouble with high idle speeds on start up, but I seem to have fixed that with a new Pcv valve. Now the car RPM's seem to run odd at higher speeds. If I am driving at 75 MPH and let my foot off the pedal the RPM's suddenly drop 400 to 500 {like there's no power for a split second}, then when I put my foot back on the pedal the RPM's jump back up to where they were. The car doesn't seem to lack any power overall and there's no engine light coming on.
Submitted: 4 months ago.Category: Mercury
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Answered in 22 minutes by:
1/14/2018
Mercury Mechanic: Gary, ASE Certified Technician replied 4 months ago
Gary
Gary, ASE Certified Technician
Category: Mercury
Satisfied Customers: 1,707
Experience: Senior Technician
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Hello! My name is Gary.
Welcome to JustAnswer.
I'm reviewing your question now, and will post back with a reply shortly.

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Mercury Mechanic: Gary, ASE Certified Technician replied 4 months ago

Sounds like the transmission has some slippage on overrun if the tacho drops by that much at 75mph.

Scan tool data will show what is happening on a road test.

Gary

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Customer reply replied 4 months ago
The car shifts without a problem. The symptoms only seem to show up when going down hill.
Customer reply replied 4 months ago
No thanks, ***** ***** rather not switch to a live phone call.
Mercury Mechanic: Gary, ASE Certified Technician replied 4 months ago

"Slippage on overrun" is how I describe it, and you can have this without any other problem.

Overrun is rear wheels turning the transmission and engine on closed throttle.

Ultimately it might be a sign of a terminal failure.

At 318000 miles, I think you are doing well with vehicle life.

Of course, you should expect there to be "no power" if you have released the throttle to zero.

Gary

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Mercury Mechanic: Gary, ASE Certified Technician replied 4 months ago

Hello again,

Do you need any further help?

I hope my advice has been of assist to you.

Kind regards.

Gary

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Gary
Gary, ASE Certified Technician
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Satisfied Customers: 1,707
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