Question about 2005 Mercury Mountaineer

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I have a 2005 Mercury Mountaineer. Most of the time when I put it into reverse, the engine cuts off or sputters like it's going to cut of. The transmission was replaced 1 year ago.

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Only in reverse? May have a shift solinoid issues or something related to it. You will need an experienced tech to do a scan check to see if any of the sensors or solinoids are out of range or slow acting as you may not get the bad code to come out rightaway but it causes durability issues and having the right experienced teck that knows how it works it will save you headaches and $$ in the long run. Also another thing that comes to mind is a possible vacuum leak from your brake booster and tgat is something you can check at home without a scanner. With a long needle vicegrips reach over and squeeze the big vacuum hose going to the booster letterly plugging the pass of vacuum inside. Very carefully start the car, apply the brake pedal and you will notice that they are stiff, then put it in reverse and see if does the same thing. If that fixes it then you have a bad brake booster, if it doesnt help any then your problem is elsewhere. DO NOT LEAVE THE VICEGRIPS ON THAT HOSE it will make the pedal very stiff and it wont want to stop which can lead you to have an accident.

Posted on Dec 12, 2014


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I have a 2005 mercury mountaineer the wrench light and service engine light comes on and moves very slow only in reverse witch causes the overdrive to light up as well what is wrong

Hello Veronica

The 'wrench light' is actually and 'engine malfunction light'. Something has failed, probably a sensor, and your vehicle is in 'limp mode'. Supposed to be just enough to get you to a garage. They will put it onto a Code Reader and then that tells you were the fault is and what needs replacing.

The error codes can be found here

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Brake Power Booster. Check the Hose and the PVC Valve.

What is happening is the Brake Power Booster is causing Back Pressure into your engine and causing it to not run properly

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Yes they eventually need changed. If you never had a tune up your probably due. Plugs, wires ,cap,rotor,airfilter, and fuel filter. All these affect the performance of the engine. Looses power, and can make it stall or cut out under loads, like when you make hard turns and the power steering pump is putting a load on the engine

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2005 Mercury Mountaineer shuts off

Could be a number of things and the information is a little vague. Does it do it when cold, warm, after driving for a distance etc. It might pay to have some one run a diagnostic machine on it. The cost for the test could actually save you money. Just make sure they have a good reputation.

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