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Mercury Mountaineer Maintenance and Repair

kswankkswank Posts: 1
My check engine light came on in my 2000 mountaineer about 3 weeks ago. I have filled the tank several different times with gas so I don't think it is the Ford gas cap thing. I think it is with the os sensor as the vehicle has baout 60,000 miles on it. Can someone tell me where to find the o2 sensors on it? Thanks.


  • Anyone know where the computer box is on a Mountaineer?
  • nvbankernvbanker Posts: 7,285
    I'm not sure, but I'd check behind the kick panels in the way back - the side the Air Conditioner isn't on, which I think is on the driver side, so check the passenger side first.
  • i belive it is located in the fire wall right behind the tranny dipstick
  • my 2000 mouintaineer w/ 302 and all wheel drive has daul exhaust with no mufflers just cats . says it is running rich in bank number 2 which is odd because last time it was the bank 1 that was exhaust is real suety and black now and it has been missing and has a stumble to it at 1500 rpms. i had the plugs wires fuel filter and pcv valve replaced about 5000 mi. i have 120000 mi on it and only recently have had this bad of also has a k and n a/f brand new.i have had older cars that the timming chain or belt ws bad and they popped through the exhuast and this also sometimes does this but not on a reg. basis like a timming chain .i was told the o2 sensor by my parts store and to be honest i think i know more about cars than they do abnd i just dont think they have much experience.can anyone help me that has experienced this prob? is it the o2 sensor map sensor coil packs or timming i dont want to buy the parts store but they want me to .it also reminds me of the mass air flow sensor that i had go out on a firebird but this does not make it die just idels fine most of the time but acts the fool when driving or beginning to take of and going down the road no matter if it is hot or cold.the dauls have been on it since 80000 miles. thanks for any info
  • I have a well maintained 03 Mountaineer. Tire have less than 25,000 miles and the wheel ailgnment is good. I have roar coming from the front end the noise remains that same no matter what the speed. This noise is even more ntoiceable when I make a left hand turn. When I turn to the right it is not as noticeable but still there. Anyone have any ideas????
  • fmotafmota Posts: 2
    Bought a 2003 mountaineer 6 months ago (Premier -V8). Recently I noticed some oil spots on the driveway, maybe an inch or 2 in diameter. However, the spots are not towards the front end......they appear to be right by the rear wheels. Almost in the center, between the 2 rear wheels. Lets just say I'm not a mechanically inclined person whatsoever.....but I normally try n search on the internet to atleast get some idea of what the problem when I take the care for repairs, I have some background info so to not get totally taken by the mechanic. Any ideas/suggestions would be greatly appreciated....thanks !
  • I had this probelm too ( I think). Mine was an axle seal and needed replacement on the driver side. My local mechanic fixed it of $270 while the dealer wanted $700 to repair both. I've put 20,000 mile on since. We now have 87000 on our 02.
  • lwoarlwoar Posts: 2
    I have some problems in my 97 Mountaineer with the antenna.
    Due to the cold weather it was frozen and I pushed it down. Now i can hear the motor but the mast does not move. Somebody can help me?
  • nvbankernvbanker Posts: 7,285
    You need a new mast, not expensive, even from the dealer. Easy to install, directions come with it.
  • I my 97 mercury mountaineer towed to a repair shop yesterday because an entire pulley or "bearing" fell off under the hood and broke the belt. He is charging $192 for the repair. Does that sound reasonable? He is just replacing one pulley and one belt? What do you guys think?
  • jfinn4680jfinn4680 Posts: 1
    Ive had my mountaineer in the shop now 4 times for it dropping off while im driving with my foot on the gas and it will just stall out at random. The dealership can't find anything but this is getting to be a bit of a hassle. Has anyone heard of this happening?
  • crusin1crusin1 Posts: 1
    YES!!! I have a 2003 Mercury Mountaineer and I have the same problem! It stalls out usually when I come to a stop. Not all the time, yet often, maybe twice a month. Very annoying, and I've at it in to get looked at and nothing. Now I'm having problems with the AC, dealer says it's $1500 to fix the broken motor. My father has the same car same year and the same problem! Call the customer service # and report your problem! They say that's the only way they know about issues people are having with their vehicles is for owners to call and have their complains documented! 1-800-521-4140.
  • my 05 mountaineer merc.v6 headlamps are alittle low, how do i adjust. I need to raise them a tab.where is the 4mm nut under the hood?? can't find it , help.
  • Hi,
    I have a 2002 Mountaineer. When filling with gas, I have to trickle the gas in or the gas pump will kick off. I checked the filler and vent hose for obstructions....none. I then bypassed the evap solenoid (I believe) and evap canister (both located w/n a couple inches of each other at the rear of the gas tank)....and that seemed to work. Would this be a culprit of the canister or solenoid?

    When the solenoid and canister are connected, I can blow in the end of the vent hose connected up by the fill neck and air easily passes into the tank, so I was confused how the vent hose could be getting restricted.

  • My 1997 Mountaineer doors will not lock or unlock when pressing on the door lock switch on the driver's side door panel. The doors will all lock from the passinger side switch; but will not unlock. Otherwise, all the doors will lock and unlock properly, ie with the key and manually. Where can I find a diagram that will show me where to look for the problem(s)?
  • mnpaulmnpaul Posts: 11
    Did you get your issue resolved? I have a 2002, same issue. Very frustrating.
  • tom140tom140 Posts: 1
    I have an 06 mountaineer and having the same problem, been in shop twice and found nothing. just stalls while driving, not often once or twice a month. Has anyone resolved this issue?
  • mnpaulmnpaul Posts: 11

    I posted this on my message thread this weekend.

    I put 1 bottle of Gumout Fuel Cleaner (From Target) and once it worked through it (it stalls a lot when it's working apparently) I have not had 1 stall in 3 days with about 200+ miles. My 2002 Mountaineer has 87K miles on it and it was stalling on the freeway at 70+ mph. Ford dealer could not find anything wrong with it!

    Good Luck
  • If your vehicle is stalling at idle, you may need to clean or replace the Idle Air Control Valve. It is accessible on the top of the engine. If you choose to replace it, you must get it from the dealer, as the stores I called did not carry this part. I believe I paid about $90. I cleaned mine a few times but the issue kept repeating, once replaced I have not had a stall at idle for over a year. Hope this helps...
  • Any advice appreciated! thanks!
  • Hi jacksocd....

    The filter is deep up under the front passenger's side, right inside of the running board and straight across from the transfer case. It's protected and hid by a small shield with a larger, silver heat shield (that runs diagonally) in front of that.

    You first need to relieve the fuel line pressure by depressing the bike tire valve located on the fuel rail on top of the engine under the big black cover that covers the whole engine. There are only 4 nuts that hold the big cover on, and once you remove those, remove the hose @ the back of the cover from it's hose guide and the cover will be free to be removed. Then you'll see the tire valve in front of you on the right side sticking up from a metal tubing line. There should be a black valve cover on top of the valve. You'll need to have a rag ready when depressing the valve since a good amount of gas will be relieved and it's under considerable pressure. Be sure the engine's not real hot when you do this just in case gas spills on the engine.

    Once the pressure is relieved and you've jacked up the passenger's front side of the car, crawl under and try to locate the two fuel lines coming from the tank at the rear of the vehicle. The filter is located just past where they make a 90 degree turn.

    You'll need to remove the diagonal, silver heat shield first. There should be 2 bolts on one end, and I think 1 on the other. Once it's removed, you should see a small cover that has two hex nuts with the filter being on the back side of this cover.

    Once it's removed, you'll notice there is only one line going to the engine and two coming from the gas tank. The fitting for the engine side requires a special tool that's readily available at any checker auto, advanced auto, type of store. When you get the fuel filter from the store, get the tool too so you can be sure you get the right size of tool. There's a latch that first has to be popped up that is hooked on the end of the fitting facing the filter. It just pops up then the special tool clasps around the nipple of the filter and pushes into the fitting.....towards the line going to the engine. As you squeeze the tool together around the nipple of the filter, push the fuel line away from the filter and it should just push right off.

    The tank side lines are a different fitting and don't require any special tool, but they're a bit of a pain to figure out since the way to release them is not readily visible. Use a very small screwdriver and put it in the trough of the maroon tab that should be facing you and pry the tab out. That will release a tab that should then be free to hang down. This has to be first released so you can then push it back up through the fitting where it has been clamped in place around the nipple of the fuel filter. It should pop through the top side of the fitting, and you can reach up and feel when it is protruding up. Once it is, the fitting should be free from the filter and the line can be pulled off of the filter.

    Be aware that gas WILL run out of the hoses, so you don't want your face or anything electrical right under the lines. It only takes a couple minutes for them to completely quit dripping after the short section of gas line has emptied.

    The new filter goes on in reverse order, and the fittings push right back onto the nipples of the filter. You should definitely feel a 'click' on the engine side of the filter when you push the line back on, and the gas side lines need to be pushed well onto the filter nipples before pushing the clasps back down and latching back the maroon tab.

    Write back if this doesn't make sense or if you have any more ?'s.........
  • Usually when you see oil in that region it is a leak in the rear differental. I would try to see if it is the access bolt seal (inexpensive). If not it is a leake in the diff housing (more expensive)
  • common, slide the gas pump a few times in and out. This happens because the air pressure in the tank triggers the shut off switch in the pump. Sliding the pump in and out some will release the pressure so the shut-off system won't falsly activate.
  • how do i change transmision oil? There is no dipstick. what is the proceedure on oil and filter change
  • Our '99 Mercury Mountaineer starts fine, idles fine, the engine revs okay when in park BUT when you put it in drive or reverse and push on the gas it stalls. We just got a full tank of gas yesterday and I'm wondering if there may be water in the fuel. I was going to buy Dry Gas and/or Gumout to see if those would help but wanted to see if anyone had a different idea. Thanks for your help! (By the way, it's been about 20 degrees here lately and my daughter's been driving the vehicle pretty close to empty!!)
  • mnpaulmnpaul Posts: 11
    Hi Jennap,

    Minnesota here---so very cold and very similar issues with stalling as you probably saw in my discussion threads. The Gummout worked well initially, but after 4-5 tanks of gas, the stalling started again.. I added a bottle of HEET and once it worked through the stalling ended. Now I am adding a bottle every other FULL tank of gas, and so far, its curing the stalling blues. We are thinking that there is a condensation build up in the fuel line or tank (no auto expert here) but the simple solutions seem to be working the best :-)

    Good luck!
  • Thanks Paul! I bought a bottle of K100 fuel treatment today and put it in. While the vehicle now goes it still wants to stall when intially starting off. It seems that as long as you don't press the gas too hard it works okay. Does yours do the same thing? Any info you can give is much appreciated. Thanks so much and good luck with yours, also!!
  • sstampe! I was wondering did u get that problem fixed with u're locks, because i'm having similar problems out of my locks. I use the master button on the driver door to lock my doors and they all don't lock. The driver side is the only one that want lock. And when I try to unlock my doors they all will unlock except for the passenger side. I have a 99 Mountaineer.
  • wtd44wtd44 Posts: 1,211
    I have a 2002 V8 Premier. I have been dreading messing with the tranny fluid, now that I have 31K miles on the rig. For the last 5.5 years, I have considered what to do when the 30K point would arrive, knowing that the maintenance schedule in the owner's manual calls for replacing the tranny fluid. I decided to talk to a local trans shop that has a great reputation and has done some (Chrysler Turbo LeBaron) tranny work for me in the past. I also talked to the local Merc dealer. I decided to go with the dealer, feeling that If problems arose after the work, they would be hard pressed to get out of it! They told me that all I really needed was a flush and cleaning, with replacement of the fluid. When I inquired about possibly changing the filter(s) they said not to do it. They said the filters are expected to go 100K miles before a change would be advisable. They used a BG product during the "cleaning" phase of the flush, and then used 16 quarts of synthetic fluid. I have only put some 500 miles on it at this post-service point, and everything seems perfect. I hope it stays that way. It is my opinion that the auto tranny used in this series of vehicles should not be neglected! Git'er done! :)
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