Why is my mountaineer overheating and continue firing

Asked by Apr 03, 2017 at 08:14 PM about the 1998 Mercury Mountaineer 4 Dr STD AWD SUV

Question type: Maintenance & Repair

2 Answers

73,795

Over heating can be due to a bad thermostat, a plugged radiator, a bad water pump. and a bad head gasket. The engine would continue to run, fire until it locked up if it overheated to the point of locking the engine up.

18,675

If it is running after you turn it off (dieseling" or "run-on). When you shut the ignition off a couple of the cylinders to keep igniting, which in turn keeps the engine running, although "sputtering" pretty badly. This can be caused by excessive carbon build-up in the combustion chambers or on the piston tops which when hot, acts like little glow plugs. This is common on engines that run way too rich or have oil burning problems. Dieseling is a common problem with high compression / high performance engines, especially in warm weather or when the engine is hot. In this case, it is usually caused by running "cheap" gas with inadequate octane. In this case it can usually be remedied by switching to a higher octane fuel. In your case its because its running hot. Need to fix the issue before you end up warping a head & blowing a head gasket, in-fact I would go ahead and perform a compression check on all cylinders and a exhaust in coolant test too make sure it has not yet of if it has already decide if you want to fix or buy another car as its costly to repair if a shop does it (labour wise).

Your Answer

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
51 Great Deals out of 1,458 listings starting at $2,800
Used Ford Expedition
13 Great Deals out of 341 listings starting at $2,900
Used Chevrolet Tahoe
8 Great Deals out of 724 listings starting at $4,995
Used Ford F-150
526 Great Deals out of 10,140 listings starting at $1,400
Used Jeep Grand Cherokee
89 Great Deals out of 2,802 listings starting at $1,500
Used Lincoln Navigator
88 listings starting at $5,000
Used Dodge Durango
122 Great Deals out of 1,057 listings starting at $2,998
Used GMC Envoy
30 listings starting at $3,990
Used Nissan Pathfinder
28 Great Deals out of 720 listings starting at $3,980
Used GMC Yukon
20 Great Deals out of 972 listings starting at $3,000

Used Cars For Sale

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.