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Dec 12, 2010 - 14 posts - 14 authors
Learn more about Mercury Mountaineer at the Edmunds.com Car Forums! ... Light came back on but no more stalling at speed. ... I have the same stalling at low idleproblem (under 500 RPM) with my 2003 Mountaineer 4.6L V8 AWD. ... My computer is telling the engine to rev at a high RPM on startup, then ...
Please keep check on the coolant level, in morning on first start when radiator is still cold open the radiator cap and rev the engine. Notice if there are bubbles and oil drops. I am suspecting head gasket leakage.
Try running a fuel system cleaner through it, This may remove deposits from the fuel system and clean the jets.
If you have never had the fuel filter changed, it is a good idea to do this every 3 years or so (or less).
If there is still no effect, it may be a faulty PCV valve or battery condition. If the battery is over 3 years old, suspect this as it causes weak spark at low revs as the alternator will not be charging at low revs. Try charging battery overnight, then start again and see if there is any improvement.
Replace battery if it is suspect, or charge with a desulphator fitted for a gradual improvement.