Question about 1994 Mercury Sable

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1994 Mercury Sable 3.8L

Engine stumbles (best word I can come up with) while cruising. Does fine under acceleration. Occasionally will idle roughly. Disconnected vacuum line to the EGR valve and problem seemed to go away for awhile, but is now getting worse. Car has had engine replaced twice by dealer so possible wire or vacuum routing problems could be in play. I replaced the EGR valve with no improvement. Current engine has about 60,000 miles.

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  • John Miller
    John Miller Oct 22, 2008

    There are a lot of wires, any idea which area I should look at?

  • Anonymous Mar 31, 2014

    Bad or no acceleration

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The car's wiring can be tested in the normal fashion (see our article on Automotive Circuit Testing here), and all vacuum lines can be checked easily for cracks, leaks and correct routing. the easiest way to test the 3 remaining components: the EGR valve, EGR vacuum regulator and DPFE sensor (or similar flow sensor). So if you have a scan tool hook it up and let's go, if not read on and we'll get around that too!

Posted on Oct 22, 2008

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This is actually a wire problem.

get the necessary wires replaced. and then get back with results

Posted on Oct 22, 2008

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Have a 2004 Murcury Sable. Whenever I turn on the heat the car starts surging high and low then shuts off. Doesn't overheat but idles poorly??? Only when turning on heat or air.


Problem With Idle Air Bypass Valve May Cause Engine ...

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If you experience difficulty starting the engine when cold, stalling at idle, ... Also, this summer electric locks stopped working and recently car seems to idle high whensitting or when I put heat on. ... I was either braking and barely moving in traffic andwhen I would also turn on the ... 2004 Mercury Sable- 3.0L V699,000Visitor.

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1 Answer

Car wont idle


There re few possibilities that can cause no idle issues.To troubleshoot the issue help links are provided below.Click the link below:---
Idle Problem? http://whatisbyme.blogspot.in/2012/05/2001toyota-corolla-idle-problem.html
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Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------
Stumbling and stalling at idle after engine rebuild? http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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Cooling fan Shuts OFF and Idle Drops? http://howtobyme.blogspot.in/2012/05/toyota-celica-cooling-fan-shuts-off-and.html

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Rough Idle and Vibration? http://whatisbyme.blogspot.in/2012/05/2006-ford-f150-rough-idle-and-vibration.html

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Steering Wheel Vibrates at Idle? http://whatisbyme.blogspot.in/2012/05/1993-toyota-corolla-steering-wheel.html

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Runs Fine But Idle Is Low? http://whatisbyme.blogspot.in/2012/05/2004-toyota-highlander-runs-fine-but.html

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Vehicle Will not hold Idle? http://whatisbyme.blogspot.in/2012/05/2003-lexus-es300-vehicle-will-not-hold.html

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Engine Idles Rough and Dies? http://whatisbyme.blogspot.in/2012/05/1994-lexus-es300-engine-idles-rough-and.html

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This will help.
Thanks.

Jul 17, 2012 | Cars & Trucks

1 Answer

1989 Mercury Sable GS 3.0L runs rough and idles down and stalls


Sounds like you might have a stuck open EGR valve. Is the check engine light on. I would replace the fuel filter if it hasn't been replaced, also check the air filter.

May 31, 2010 | 1989 Mercury Sable

1 Answer

I have a 2000 Mercury Sable. runs at speed and under load but idle is rough and stalls frequently while at the lights or just sitting for a short time in drive or park. I changed the plugs, the air and...


There are many possibilities on this. Anything from bad Gas, Bad Ignition Wires, Bad Distributor/IgnitionCoil, Intake Air Leaks, Bad Sensors etc.
It sounds like a malfunctioning Idle Air Control Valve. You can take this off and clean it with Carb Cleaner. Reinstall and check operation. If it helps but does not solve completely the problem: Replace this.
Check your Ignition Wires and Distributor/Ignition Coil.
The Idle Control Valve is available at
(no-I don't work for either store/company)
Autozone Part #TV281 for around $51.
Advance Auto Part #50523 for around $52.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

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1 Answer

My 2002 Windstar has 285K kms. on it, love the van


could be your (TPS) throttle position sensor

Jan 24, 2010 | 1995 Ford Windstar

1 Answer

Help identify noise in Taurus - Sable


where does the noise come from? engine? back of car? can you feel it in the steering wheel? more through the brake pedal? is it worse under heavy braking? does it change when you brake or accelerate harshly?

Jan 15, 2010 | 1996 Mercury Sable

1 Answer

My 2003 Mercury Sable station wagon with the 24 valve 6cyl. seems to be missing at idle and occasionally on acceleration. I changed the plugs and wires and ran fuel injector cleaner for a month. Nothing...


Check the coil out put.
Loosen the wires from the plugs with the engine off then find some plastic plyers or an insulated tool to remove the wire without getting shocked.
Start the car and one by one remove and replace each wire to see which one does not make a difference in the way the engine runs. Thats the one that probably has a bad coil.

Oct 31, 2009 | 2003 Mercury Sable

1 Answer

Cruise control for 1994 mercury sable four door sedan not working


There are numerous things that can cause this. A fuse, a vacuum leak, a bad switch in the steering column. The switch in the steering column is usually the culprit but is also the hardest and most expensive to change. Best way to find out is to plug it into a computer and see if it reveals any trouble codes.
Also of the many things that can go wrong outside of replacing the servo controller.
Check the servo deactivation switch. Located on the brake pedal arm under he dash. This will require you to remove the black plastic duct fot shield to expose the under dash area. It only has 4 plastic speed grommets. You will see to switches on this brake arm.
The lower one activates the brake lights. The upper one deactivates the cruise control and is a common failure in 1998-2002 Ford mercury Crown Vics and Marquis. Remove the connector(also known as connector c223), and check the continuity of the switch opened or closed. It should change from infinite to a short using a standard voltage meter set to ohms or continuity and pushing the brake pedal.
Also Fuse number 1 (15amp blue fuse) located there under the dash as well, is the primary fuse for the cruise control servo. In most cases you will see this ok

Sep 08, 2009 | 1994 Mercury Sable

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