Question about 2008 Mercury Grand Marquis

7 Answers

Rapid Acceleration 2006 Merc Grand Marquis (just 29,000 miles). Approaching Traffic light & cross walk at <<20 mph. Took foot off accelerator and just touched brake when car took off at high rate of acceleration. Was very difficult to stop car with footbrake so slamed the car in neutral. High revs abated and car finally stopped across other side of cross walk. A highly dangeraous situation. Can anybody tell me what caused this and how to rectify. Car currently at garage.

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  • 7 more comments 
  • ANTHONY SEELEY Jun 23, 2009

    Does anyone else have any suggestions.?

  • ANTHONY SEELEY Jun 23, 2009

    As there are no other negative conditions with the auto, which of your suggestions are the most likely? It has only happened the once --- but that was enough!

    Do I have to get all your sugesstions checked out?

    You maybe aware that this "complaint" is repoorted numerously in AboutAutomobile.com

    but it never posts solutions.



  • ANTHONY SEELEY Jun 23, 2009

    Do you agree with this advice or are there any other opinions or suggestions.
    Thanks

  • ANTHONY SEELEY Jun 23, 2009

    It sure would be nice to find someone who has actually had similar experience and has found a known cure! Come on guys I know you are out there somewhere.!!

  • ANTHONY SEELEY Jun 23, 2009

    Nobody sounds very confident!

  • ANTHONY SEELEY Jun 23, 2009

    At last it seems I have found someone who appears to know what they are talking about --- thanks.

    BUT -----

    1.) can you be more specific as to what you mean by "When condition occurs?"

    2.) what to do if it is a command problem?

    Please note I will be dealing with a Ford Dealer Garage and I need to ensure they are looking in the right places for the defect.

    Thanks

    Tony











  • ANTHONY SEELEY Jun 24, 2009

    1.) Is the sticking IAC motor to which you refer the same as what "cj2176" refers to as "carbon build up in throttle boar"?

    2.) "cj2176" claims that a "bad vacuum leak is causing the ECM to over compensate".

    Does this have any validity?

    Thanks, Tony

  • ANTHONY SEELEY Jun 24, 2009

    It cannot be hooked wrong as it is all electronic. It has only happened once in 29,000 miles.

  • ANTHONY SEELEY Jun 25, 2009

    I give up!

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7 Answers

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  • Contributor
  • 241 Answers

Goto

autos.yahoo.com/2006_mercury_grand_marquis/


and u will find the repair manual for 2006 Merc Grand Marquis

thank u................................

Posted on Jun 24, 2009

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  • Mercury Master
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What has to be determined is if the idle problem is a command or mechanical problem. A command problem is the computer deciding the desired idle speed. If it is a command problem then it can be isolated rather quickly. Have your technician show you where the Idle Air Control (IAC) motor is located and how to electrically unplug it. When the condition occurs, unplug the IAC motor’s electrical connector. If the idle drops then you have a command problem. If it doesn’t you may have a sticking IAC motor. The fix for a sticking IAC motor is a cleaning or replacement. Most of the time I’ve found that a problem like yours lays with the IAC (Idle Speed Control Motor)..

Posted on Jun 23, 2009

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  • yadayada
    yadayada Jun 23, 2009

    The condition seems to happen at random, no rhyme or reason that i have found so far except it happens more hot engine than cold engine, I have been a Ford dealer tech for 25 years and have only seen this a few times, but the IAC has fixed the high idle concern every time.

    Please rate my help if you would. thanks

  • yadayada
    yadayada Jun 23, 2009

    I have never seen a command problem, but that would be related to the TPS (Throttle Position Sensor) signal most likely, it RARELY can be a PCM (Powertrain Control Module) problem

  • yadayada
    yadayada Jun 23, 2009

    Just wanted to add that the high idle is the same as the unexpected acceleration.

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  • Expert
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The throttle may be hooked faultey or the carbrator needs cleaned

Posted on Jun 24, 2009

Actually its a technical default. there may be some problem with the pedals and the gears.
Try contacting dealer and get ur problem sort out.

Posted on Jun 23, 2009

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  • Master
  • 400 Answers

Plz check the break Oil and get checked the break leathers... it is also caused when the tyr gone very smooth which does not creat proper friction to the car.. check your tyres to .. regards

Posted on Jun 23, 2009

  • Azum Saeed Jun 23, 2009

    I have faced the same problem..............with my (Charad car)

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  • Master
  • 520 Answers

This could be a variety of things.

* Bad TPS " Throttle position sensor "

* Carbon buildup in throttle boar Causing it to stick

* Bad MAP sensor " Manifold absolute pressure "

* Bad ECM " Engine control module " " computer "

* Bad connection to ECM

Please re-post with an update.

Posted on Jun 23, 2009

  • Chris  Jones
    Chris Jones Jun 23, 2009

    OH yes and a bad vacuum leak that is causing the ECM to over compensate by accelerating.

  • Chris  Jones
    Chris Jones Jun 23, 2009

    I would start with the smallest then work to the largest. the smallest being the throttle boar being caked with carbon buildup. That's one of the first things that any shop should look at. If it does it again then start testing the sensors. Then the next step would be the ECM. I believe the throttle boar is going to take care of it though. If the boar is too dirty then it gives the ECM false readings and then it over compensates to correct the issue.

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  • Master
  • 10,515 Answers

Hi,

Believe me THIS IS REALLY DANGEROUS AND MANY PEOPLE HAVE SOME SERIOUS INCIDENTS.

This is a serious issue with mercury cars and as of now, there is no 100% solution for the same. People have register many complaints against MERCURY.

We can work and i can tell you what really works with people. I am not sure how much success it would have in long run.People have gone through situations when they press brake, the car took off like ROCKET.

There are only 2 faults that they came across :-

1. They have changed the brake booster.
2. Replace cruise control

Hope i have helped you.

Thanks for using "Fixya".

Posted on Jun 23, 2009

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