Question about 2002 Mercury Mountaineer

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Jumps in and out of 5th gear overdrive,doesnot slip

Under normal acceleration transmission shifts normal without slipping. no lights or service indicators set on. running in 5th gear it will on its own shift down and shutters back into 5th gear.

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  • Anonymous Mar 17, 2014

    automatic transmission up and down shifting

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  • Master
  • 811 Answers

Change trans fluid and filter

Posted on Oct 04, 2009

Testimonial: "First time I have gotten and answer other than "that will cost about $1500 to $3200 to fix"."

  • yadayada
    yadayada Nov 09, 2011

    Change filter and fluid and you grabbed that? Look some times we hand out hard advice, likely based on your symptoms you will need a transmission rebuild. 25 years a Ford dealer technicain backs me up on this preliminary diagnosis. The best thing to do here is have the fluid pressure checked and a diagnostic scan run on the transmission control module, if any electronic problems exist that are contributions to this problem a fault code should be in memory. Also do you have a Overdrive light flashing on the shifter?

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1 Answer

Transmission over drive is causing the transmission to slip. When I take off the overdrive the transmission functions normally but it uses much more gas.


Roger, that doesn't even make a whole lot of sense to me. If the overdrive is causing the transmission to slip, wouldn't it also cause the fuel mileage to go down? Are you sure the transmission is slipping? Or is the transmission simply shifting in and out of overdrive? If it is, is it shifting at the proper speeds? Driving at around 40 - 50 Mph will sometimes make the transmission go in and out of overdrive repeatedly. This can be perfectly normal.

Have you checked your transmission fluid level?

Is your overdrive off light flashing? If the transmission is actually slipping the OD OFF light should be blinking at you to let you know there is a transmission problem. Either that, or the Check Engine light will be coming on. In either of these cases, you need to scan your onboard computer network for possible fault codes.

Mar 06, 2012 | 2000 Lincoln Town Car

1 Answer

I lost reverse and overdrive is slipping and humming at low speeds on my 4.3L two wheel drive '97 sonoma! Does this mean a whole new rebuilt/swap transmission or can it be something less such as a


Yes it can be transmission issue,as per the problem.In this condition i suggest to you to go through the procedure mentioned in following help links.Click the link below and go through troubleshooting procedure to confirm the problem :-----Engine stumbles and shuts off in forward gear? http://schematicsdiagram.blogspot.com/2012/01/engine-stumbles-and-shuts-off-in.html-----------Transmission problem? http://schematicsdiagram.blogspot.com/2012/01/transmission-problem.html
---------Automatic transmission will not go into high gear? http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html
------------Transmission shifting problem on Toyota Land cruiser? http://schematicsdiagram.blogspot.com/2012/01/transmission-shifting-problem-on-toyota.html
---------Transmission Slips out of gear? http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html
---------OD light flashing and transmission fluid leaking? http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html
-----------Overdrive light in the dash blinks? http://repairhelpcenter.blogspot.com/2012/01/overdrive-light-in-dash-blinks.html
----------O/D OFF light flashes ? http://technoanswers.blogspot.com/2012/01/od-off-light-flashes-on-ford-explorer.html
---------While going in reverse mode Fuse number 27 blows? http://howtobyme.blogspot.in/2012/02/while-going-in-reverse-mode-fuse-number.html
---------This will help.Thanks.

Feb 16, 2012 | 1997 GMC Sonoma

1 Answer

Heres the symptoms : engages but slips in reverse and drive, sometimes feels like partial brake applied. I have manual 1st and 2nd. When engaged in drive, you turn off overdrive and you can spin the...


it may be a bad transmission modulator valve located on the side of your transmission,vacum operated. a sudden downshift or forward shift when unexpected is sign of a bad modulator valve or a vacum leak to the transmission.best to shop around for a garage w/references when it comes to transmission work though. check all the vacum lines to your transmision,you need to look on the underneath side of your truck on the side of transmission for a loose or disconnected vacum line on the side of the transmission. when you feel the vacum line,follow it to the top of engine,the vacum line is about 3/8th line,and may be disconnected or losing air. to make this short,when you drive the car,start out in low gear and shift the transmission,manually from 1st to 2nd to 3rd does it do right with no slipping? if it does this right and shifts great manually,the modulator valve on the side of the transmissions bad,or a bad vacum leak in-between.thank you for choosing fixya.com

Apr 09, 2011 | 1998 Ford Explorer

2 Answers

1996 Nissan Terrano diesel automatic. How and when can you change High to Low ratio? What does the toggleA/T button, which has 2 seetings - power and hold, do? What does the dial which has 3 positions -...


High to low /low to high ratio, you will need to be stopped and the transmission in neutral for this to be changed.
The 2wd - Auto - Lock switch can be switched at any time, as it operates an electromagnetic clutch - 2wd is rear wheels driving only - Auto - is to automatically engage 4wd when wheel slippage is detected (this also happens when turning at intersections, due to the inside wheels having a shorter path to the outside wheels, and can give a binding effect on sealed roads (I don't drive with it in auto on sealed roads) auto is excellent if you get, or expect wheel spin from an intersection when wet, just flick it on before or when you have wheel spin, also on gravel roads, having it on auto will greatly reduce the sliding of the back end, and make the car noticeably more stable.
Lock - this locks the differential, which further reduces wheel spin, when in mud / snow, but this will also make the car not want to turn corners, due to it resisting the different distances traveled by the inside and outside wheels.
A/T switch - this actually has 3 positions, and changes the shifting points of the automatic transmission - the middle is normal - Hold is to hold the gear longer, to improve fuel economy, and not change down (kick down) as quickly - Power has the opposite effect, it makes the transmission change down sooner under acceleration.
Also the O/D (overdrive) button on the side of the Tee shift lever, is to engage / disengage overdrive (5th gear) - never do heavy towing in overdrive, this will cook the transmission and overheat the engine (due to the radiator being used as a heat exchanger for the transmission fluid.
Another little quirk - if the transmission light starts flashing every 40 to 50 km, this can indicate that the wheels are different diameters (a flat tyre, or tyres have been swapped around and the spare is more or less worn than the other tyres), the computer will pickup that the wheels are turning at different speeds.
When cold, it is normal for the transmission to stay in 3rd (2-3 minutes of driving), until it has warmed up, and then stay in 4th for a few more km's (5-6 minutes), before it has warmed up enough to change into 5th (overdrive).

Mar 07, 2010 | 1996 Nissan Pathfinder

1 Answer

Daughter says that car is not accelerating right in 5th. When she pushes down on gas petal, the RPMs rev and it doesn't accelerate. But if she eases down on gas, it will accelerate. Car has a manual...


The clutch is slipping, eventually it will fail completely. The reason she notices it in 5th gear is because 5th or overdrive uses the transmission the most IE low rpms high speeds. Soon it will affect all gears. Sorry the only way to fix it ts to replace it.
I think they make a clutch kit for this model
Good luck
Hope this helps
Please leave feedback

Dec 17, 2009 | 1994 Acura Integra

1 Answer

Shifts hard and jerks under hard acceleration.


thottle positioning sensor? if trans has overdrive could be a lock up piece, dont remember name of it. there is a lucas oil product that might help. if it is the overdrive.

Nov 05, 2009 | 1994 Ford Taurus

2 Answers

Engine revs but car doesn't accelerate


Since you did not say what type of transmission you have i will suspect the clutch is slipping if it's a manual.
If it's an automatic, it could be several things. Low fluid level...clogged filter, fluid needs to be changed..transmission serviced...weak pump, bands/clutch packs worn...etc
Good luck..i hope this helps, please rate me a fixya.

Jul 29, 2009 | Hyundai Motor 2002 Elantra

1 Answer

Transmission


The 5r55w transmisson is known for wearing out the case where the front and middle band servo pins go thru. If it wore the front band servo, it would slip in 2nd. But if it slips in 1st and 2nd it sounds like it could be a weak forward clutch. How many miles does it have on it. If you can get it up into the higher gears, does it slip in 5th. 2nd and 5th use the same band to apply them. Are you gettting and overdrive off light flashing? IF yes, what codes?

Apr 01, 2009 | 2005 Ford Explorer

1 Answer

Hard shift and blinking overdrive


The blinking overdrive button is telling u that a serious fault has occurred in the electronic controls or a mechanical fault such as excess slippage is occurring.

Jul 16, 2008 | 2000 Ford Ranger SuperCab

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