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Mercury preventive maintenance repair questions and answers

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  • Deb Wells
    Deb Wells - 2001 Mercury Sable - Preventive Maintenance - 10/11/2011
    Squeaking coming from the engine
    Just replaced the serpentine belt (3) weeks ago.
    • yboy82
      10/11/2011 yboy82
      Try to check the condition of your serpentine belt and check the pulleys (might be misaligned/damaged).
  • Wendy
    Wendy - 2000 Mercury Cougar - Preventive Maintenance - 10/2/2011
    What would cause flashers to stop working? Fuse? And when is it located?
    • yboy82
      10/2/2011 yboy82
      Did you already check the flasher relay? You should remove the steering column cover and the flasher relay should be located underneath the turn signal.
  • tofoxer
    tofoxer - 2007 Mercury Mariner - Preventive Maintenance - 9/29/2011
    The horn blares with the lights on but not with high beams on
    0 answer
  • Ken
    Ken - 2000 Mercury Grand Marquis - Preventive Maintenance - 9/23/2011
    How do I replace lower radiator hose on my 2000 Mercury Grand Prix LS 5.0 8 cyclinder?
  • Beverly
    Beverly - 1991 Mercury Cougar - Preventive Maintenance - 9/9/2011
    Failed emissions.High Co
    • Spoon Sports
      9/9/2011 Spoon Sports
      Below are common failures which are likely to produce high Hydrocarbon HC. Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. However, it's not always that the engine's ignition system is responsible for high Hydrocarbon emissions. Read on.

      1. Improper Ignition Timing - Engine ignition timing is measured in degrees before or after Top Dead Center (TDC). Example of an ignition timing failure would be in the case where an engine's ignition timing is required to be set at 10 degrees Before Top Dead Center (BTDC) and instead is set to 15 degrees BTDC. This fault will not only cause a smog check "functional failure", but will increase Hyrdocarbon (HC) emissions as well. California allows 3 degrees +/- off of the manufacturer's required setting. Note: Late model vehicle's may not have a distributor, and therefore no timing adjustment will be needed. On these engines timing is electronically controlled by the ECU (Engine Control Unit).

      2. Defective Ignition Components Your vehicle's ignition system consists of the ignition coil/s, distributor*, distributor cap*, distributor rotor*, ignition wires, and spark plugs. If any of these components are defective the engine will produce high hydrocarbons. A common reason ignition components perform poorly is due to carbon build-up. High ignition voltage traveling through the air pockets within these components form carbon. Carbon acts as an insulator between paths of electricity, decreasing the energy required at the spark plug to ignite the air/fuel in the combustion chambers properly. *Distributor-less engines do not have these components.

      3. Lean Fuel Mixture - Any condition which will cause unmetered air to enter the intake manifold, and ultimately the combustion chambers, will cause high hydrocarbons (HC). This condition is called a lean miss-fire. Such faults as vacuum leaks and gasket leaks will cause lean fuel/air mixtures. Broken, disconnected or misrouted vacuum hoses will do the same. It is also important to note that many engine components rely on engine vacuum for proper operation. If any of these components are defective, externally or internally, they may cause large vacuum leaks as well. A good example of such a component is your vehicle's power brake booster.

      Which Type Should I Choose?

      * Failed High HC Emissions
      * Failed High CO Emissions
      * Failed High NO Emissions

      4. Defective Catalytic Converter - A defective catalytic converter (CAT) may be responsible for high HC, CO, and NOx emissions. The Catalytic Converter, commonly referred to as the CAT is a component designed to continue the combustion process within itself and emit a more thoroughly burned and less harmful emissions containing exhaust. The most accurate way to find out if your vehicle's CAT is working efficiently is by using an exhaust gas analyzer. Unfortunately this tool is fairly expensive. Testing the CAT should be conducted at a smog check repair station.

      Some obvious symptoms of a bad CAT could be any of the following:

      a. Major loss of power over 15-25 mph. This may be an indication that the catalytic converter is plugged up and restricting exhaust flow.

      b. Strong sulfer or rotten egg smell emitting from the exhaust on an otherwise good running vehicle. This may be an indication that the Catalytic Converter isn't burning fuel completely, instead storing it, then releasing it as hydrogen sulfide.

      c. Loud rattle being heard from inside the CAT. This may indicate a broken Catalytic Converter substrate. You may want to insure this sound is not due to loose exhaust components, i.e. broken muffler flanges, loose exhaust pipes, loose or cracked exhaust manifold.

      5. Defective Air Injection Components - Faulty smog pump and related emissions system components will cause high HC. The air injection system is designed to introduce additional oxygen, after the metering system, to the engine exhaust as it exits the exhaust manifold, or directly before it enters the Catalytic Converter; thus burning whatever remaining fuel (HC) in the exhaust completely.

      6. Low Cylinder Compression - This fault is one of the less common high HC causing problems we encounter. Reasons an engine may have low or no compression in one or more of its cylinders may include things such as burned intake or exhaust valve/s, defective valve guides and/or seals, defective piston rings, and burned head gasket/s. A wet/dry cylinder compression test will diagnose this fault. More then often if such a problem exists it will be very apparent. You should notice rough idle.
  • mirna
    mirna - 2002 Mercury Villager - Preventive Maintenance - 9/6/2011
    When i first turn van on and drive it for about one to two miles it will stall.
    After 4 or 5 hours, it will turn back on and the same thing happen, it will stall. The Security light is on when I get ready to drive the van. Could the alarm be causing the problem. I don't have orginal key only a coy of it and that dose not have the alarm ...
    • Nissan Technical Advisor
      If the security lights does not stay on while driving then there's nothing to worry. In your problem, i suspect a bad knock sensor but you have to verify this using a scan tool. Try to visit any AutoZone part shop and get a free scan for your engine computer. Post the codes here so everybody can advise repairs.
  • Jim
    Jim - 2008 Mercury Mariner - Preventive Maintenance - 8/19/2011
    How to Install Lift supports
  • JOE
    JOE - 2006 Mercury Grand Marquis - Preventive Maintenance - 8/10/2011
    • yboy82
      8/10/2011 yboy82
      It is possible that your IAC valve or EGR valve is dirty/defective. You should diagnose your vehicle with a scan tool to verify if there is a stored troublecode and to check if all your electrical controls and sensors are still functioning well.
  • Mike
    Mike - 2003 Mercury Grand Marquis - Preventive Maintenance - 8/3/2011
    Does it have a cabin air filter?
  • angie
    angie - 1994 Mercury Villager - Preventive Maintenance - 7/27/2011
    What is the plastic plug going to bat. post?
    • DieselMech.
      7/27/2011 DieselMech.
      If your refering to the red plastic square cover on top of the battery then that is just a protective shield that prevents anything from touching the positive lead to the battery.
  • craig
    craig - 1992 Mercury Grand Marquis - Preventive Maintenance - 7/25/2011
    Why dose the gas gage on read out do not read right i do not know when i am out of gas untill it runs out.
    this promblem happens all the time. i need to know if this the fuel pump or is it electrical?
    • CVO
      7/25/2011 CVO
      1.Remove the wire lug from the fuel tank sending unit.
      2.Ground that lug to the known good chassis ground and if the fuel gauge is reading in full, then the gauge is working.
      3.Inspect the fuel sending unit and replace it as necessary.
  • eddie
    eddie - 1996 Mercury Villager - Preventive Maintenance - 7/8/2011
    why does my car battery discharge after every one week or more at park?
    • Jimm
      7/8/2011 Jimm
      May have an electrical drain somewhere, light or switch left on over extended periods to drain the battery. Suggest to go through the interior and exterior carefully, and look for any light or electrical-powered accessory that is on - when it should be off. Check the interior lights, door switches, instrument panel and guages, etc. Also, take the vehicle to a local auto parts retail store, Advance Auto, Auto Zone, NAPA - to have the charging system tested - for free - to insure the condition and operation of the; battery, alternator and regulator - and related wiring / connections.
  • eddie
    eddie - 1996 Mercury Villager - Preventive Maintenance - 7/8/2011
    Temperature gage flickers down and back to normal range.
    gage flickers several times during acceleration and at idle speed.
    • Jimm
      7/8/2011 Jimm
      Several possibilities; may be faulty temperature guage connection / corrosion, may be temperature sending unit is faulty or poor connection / wiring.