Question about 2003 Mercury Mountaineer

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How do you change the spark plugs on a 2003 mercury mountaineer 4.6L?

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  1. Most of the 4.6 Litre engines have some form of plastic cover, mine was held in place with two 11mm nuts at the front and press-fit connection at the back. Remove this cover to gain access to the spark plugs. You may need to disconnect the air hose going to the throttle body and some additional vacuum hose connections. Mark them with masking tape and numbers if you have any question about re-attaching them correctly. Along each side of the intake manifold you will see 4 round coils held in place with a 7mm bolt on each one. Remove the 7mm bolts from each coil. Each of these coils has a connector that will be disconnected by pinching the connector to release the catch and pulling gently. Do not worry about marking them unless the wire harness has been modified. The factory wire harness keeps the connectors next to the correct coil.
  2. Remove each coil and plug connector by gently turning the unit to break the rubber loose from the manifold, then pulling up on the coil/plug connector as a unit. Do not be alarmed if the rubber boot cover comes off, you can easily reattach it to the coil. Once the coils and rubber boots are removed, use your compressed air source or vacuum to remove as much debris from around the spark plugs as possible. Warning: Wear Eye Protection when using compressed air.
  3. Remove the spark plugs using the 5/8" spark plug socket, swivel, extension and ratchet. Some engine installations may require additional extensions or swivels to get the back plugs removed. It normally takes just an 1/8 turn to break the plugs loose and then about 4-6 full turns to fully remove the spark plugs. If the plug does not come out with the socket, use the magnetic pickup tool to pull the plug out. You will not be able to reach it with your fingers.
  4. Using the feeler gauges gap your new spark plugs to the correct gap for your vehicle. A typical spark plug gap for this engine is .054 inch. With the plugs gapped, fit the rubber fuel line to the top of a spark plug and then apply a small dab of anti-seize compound to the plug threads. Work the anti-seize into the threads a little bit and then insert the plug into the engine. The rubber fuel line will prevent you from cross-threading the spark plug and you should be able to turn the plug in about 3/4 turn or more easily. If not, remove the plug and make sure that it has not picked up any debris in the threads. If so, clear it out and try again. Once you have all of the plugs started, use the 5/8" socket to tighten them just 1/8 turn past their stopping point. Do not over tighten as this is the leading cause for plug-blowout with this engine series.
  5. With all of the spark plugs back in, you can then proceed to replace the coil/plug connectors. Replace the 7mm bolts for each coil and tighten them snugly but do not over tighten. With the bolts tight, the coil/plug connector should still rotate slightly. Reconnect the electrical connectors for each coil by gently pushing them in place until they click. They are indexed and will fit only in one direction.
    Reconnect the air hose to the throttle body and any vacuum lines that were removed. Replace the plastic engine cover and fasten it in place. That's it, your done.

Posted on Apr 28, 2010

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2 Answers

2003 mountaineer V8 Temp gauge jumps to hot not over heating. Replaced thermostat, no change


The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.

Jan 06, 2013 | 2003 Mercury Mountaineer

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Mar 05, 2011 | 2004 Mercury Mountaineer

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Where are the spark plugs located on a 2003 mercury mountaineer


Hello. in the usual place, you will not recognize them as you cant see them as they have a coil pack on top of each one. coil is about 1 1/2" round thing with a 7mm bolt holding it on. take the bolt out and pull off the coil pack and you can get to the plugs. Joe

4 thumbs up please. ty.

Nov 06, 2010 | 2003 Mercury Mountaineer

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My 2003 mountaineer engine light is on. the code reads cylinder #8 the spark splugs have been changed, The mechanic says he has to take the top of the engine off to get to the problem. Is this true?


replace the ignition coils if you are having misfires. These engines are known for faulty coils. Replace all 8 spark plugs and coils. Does not require removing top part of the engine.

Sep 30, 2010 | 2004 Mercury Mountaineer

1 Answer

When should I change my plugs on 1999 mercury mountaineer?


I have a 2003 and changed the plug at 90000 miles hope this helps CJ

May 25, 2010 | 2004 Mercury Mountaineer

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Wher is the fuel filter located on a 2003 Mercury Mountaineer and how do you change it?


Mercury Mountaineer fuel filter is located in front and on top of fuel tank behind two shields. . When you look just behind the front passenger side tire you will see the first shield. Behind that is the second. U will need to buy the fuel line release tools to get the lines off the filter, any good auto parts store will have these.

May 02, 2009 | 2003 Mercury Mountaineer

1 Answer

How do you access the spark plugs 2002 mercury mountaineer


IIRC these are a coil over design. meaning the coil is over the plug. the coil should have one 8mm bolt holding it on the lower intake manifold. remove the coild to get to the spark plugs. look by the fuel injectors, coil should be just next to it or very close. coil usually says motorcraft on it and circle in design.

good luck
Michael
ASE certified

Feb 09, 2009 | 2002 Mercury Mountaineer

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