2006 Mercury Mountaineer - Idles fine. Sputtering/losing power while driving

Asked by Nov 03, 2014 at 08:42 PM about the 2006 Mercury Mountaineer Premier

Question type: Maintenance & Repair

Over the past couple of years I would notice a stutter in the engine while driving.  
Progressively got worse.  That stutter turned into knocking and acting like it would die.  
While not in drive, it idles fine.  Give it gas and it revs fine.  While driving though, I get
the stutter, then the loss of power and have to pull over as it knocks and clunks and
just won't go.  Mechanic replaced fuel pump and filter.  Said he saw a loss of fuel
pressure.  Drove it today, back to the same ol' problem.  Any ideas?  Can the exhaust
system/catalytic converter cause this behavior?  O2 sensor?

6 Answers

67,495

Could be converter stopped up,causing it to flood it self,have it checked,and if that is ok,do a compression check on the engine cylinder,s,

1 of 1 people found this helpful.
Best Answer Mark helpful
19,890

Ditto what T_S_T said. Yes the converter if plugged can restrict the exhaust flow to the point it will not run at all.

1 of 1 people found this helpful.
34,985

Any CEL's on?

No CELs. Weird. If converter is the issue, wouldn't it do it when idling and reving while not in drive? Any chance it could be some sort of fuel sensor? (since there is loss of fuel pressure noted)

19,890

It could be a combination of things. Fuel pressure regulator comes to mind.

1 of 1 people found this helpful.

did you ever figure out what it was. my old oine did it an it was just the spark plugs.

Your Answer

Mountaineer

Looking for a Used Mountaineer in your area?

CarGurus has 1,182 nationwide Mountaineer listings starting at $750.

ZIP:

Mercury Mountaineer Experts

  • #1
    Tom Demyan
    Reputation
    580
  • #2
    kbro
    Reputation
    460
  • #3
    tuff4x4
    Reputation
    300
View All

Related Models For Sale

Used Ford Explorer
812 Great Deals out of 63,292 listings starting at $1,495
Used Mercury Mariner
40 Great Deals out of 1,280 listings starting at $2,475
Used Ford Expedition
401 Great Deals out of 21,916 listings starting at $1,500
Used Jeep Grand Cherokee
938 Great Deals out of 71,552 listings starting at $995
Used Lincoln Navigator
92 Great Deals out of 5,094 listings starting at $1,900
Used Ford Escape
1,132 Great Deals out of 85,647 listings starting at $999
Used Chevrolet Tahoe
647 Great Deals out of 36,708 listings starting at $1,800
Used Dodge Durango
298 Great Deals out of 20,448 listings starting at $999
Used Nissan Pathfinder
310 Great Deals out of 24,072 listings starting at $2,200
Used Ford F-150
2,228 Great Deals out of 182,699 listings starting at $1,500
Used Honda Pilot
423 Great Deals out of 25,675 listings starting at $995
Used Toyota 4Runner
240 Great Deals out of 21,560 listings starting at $1,500
Used Lincoln Aviator
6 Great Deals out of 237 listings starting at $2,495
Used Cadillac Escalade
213 Great Deals out of 11,092 listings starting at $2,888
Used GMC Yukon
429 Great Deals out of 20,960 listings starting at $1,495

Used Cars For Sale

2010 Mercury Mountaineer Premier For Sale
9 listings starting at $6,500
2009 Mercury Mountaineer Premier For Sale
6 listings starting at $9,995
2006 Mercury Mountaineer Premier For Sale
12 listings starting at $3,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.