Location of Spark plugs - 1999 Mercury Grand Marquis

Cars have 4-8 spark plugs located on the engine block each is connected to the distributor cap with a cord.

The spark plugs in the v6 can become an involved job as the upper intake manifold. The LS uses a Coil on Plug (COP) ignition system, meaning that the spark plugs are located under the ignition coil

Locate the spark plug wires in the Cherokee cylinder head. In the 4.0 liter engine, the spark plugs are below the coil rail assembly. On the 4.7 liter engine, the spark plugs are located under each corresponding engine coil.


Read more: How to Replace Spark Plugs in a Jeep Grand Cherokee ' eHow.com http://www.ehow.com/how_4484626_replace-spark-plugs-jeep-grand.html#ixzz27zi6736d

The spark plugs are located under the four spark plug wires that go through the middle of the valve cover on top of the engine. With a twisting motion, remove the plug wires from the spark plugs. Then using a 5/8 inch spark plug socket and inch extension on a 3/8 inch ratchet, remove the spark plugs. Gap the new plugs to the correct gap (located on the label on the underside of the hood), and in stall into the holes in the valve cover using only your hand to get them started, then tightening with the ratchet. Then reinstall the wires back to their original locations, and you are finished.....

First, remove the no. 1 engine cover. Locate the ignition coils, these will be squarish-looking packs with spark plug wires (4 of them) coming out. The wires should be going to the spark plugs, which are on the front and back side of the engine.
Grab the ignition coils or spark plug wires by the thick plastic piece at the end of the wire. Squeeze the end and turn it to release it from the spark plug. Pull back to remove the plug from the engine.
Slide the spark plug socket over the spark plug. The most common size of spark plug socket used on a Toyota Highlander is 16mm. Turn the socket to the left to unscrew and remove the spark plug from the cylinder well.

Here's a link that will help you. I've included the info that you need to locate the plugs below. Good luck!

http://www.ehow.com/how_4484637_replace-spark-plugs-oldsmobile-alero.html

To gain access to the spark plugs and spark plug wires do the following. In a 2.4 liter engine, remove the ignition coil and module assembly from the top of the engine to gain access. In this Alero model's engine, the spark plugs run down the center of the engine. In a 3.1 liter engine, remove the air cleaner to gain access. The spark plugs are located next to the engine oil reservoir. For a 3.4 liter engine, remove the windshield wiper module cover and rotate the engine for service access. For a 2.2 liter engine, the spark plug wires are located across the top of the engine and require no components to be removed for access to the spark plugs.

The spark plugs are located in the front upper half of the motor (4 of them). Each spark plug has a spark plug wire connected to it. The spark plug wires run from the drivers side of the engine to the spark plug so just follow the wires to each of the spark plug locations.

Your spark plugs can be located in 2 different locations.
1 if your engine is sitting front to back of the vehicle your plugs will be located on the drivers side and the passengers side of the vehicle.
2 if your engine is set from one wheel well to the other than your spark plugs will be located on the front of the engine ( front towards the bumper/grill.) and next to the firewall.

4.6L, 5.4L & 6.8L Engines

1. Disconnect the negative battery cable.
   
2. Remove the coil on plugs as outlined under Ignition Coil in this section.
   
3. 
   
4. Remove the spark plugs.
   
5. Inspect the spark plugs
   
6. Adjust the spark plug gap as necessary. Proper gap is 0.52–0.56 in. (1.32–1.42mm).
   
7. 
   

installation.

1. Install the spark plugs and tighten them to 13 ft. lbs. (18 Nm) for 4.6L and 5.4L SOHC engines. For 5.4L DOHC and 6.8L engines, tighten the spark plugs to 15 ft. lbs. (20 Nm).
   
2. Install the coil on plugs.
   
3. Connect the negative battery cable.
   

You didn't specify whether you have the (4) cylinder or the (6) cylinder engine..... I have a 2004 Hyundai Sonata 2.4L 4 cylinder and I just changed the spark plugs in it. I believe that the 2005 2.4L engine is the same. To locate and change the (4) spark plugs on a 2004 Hyundai 2.4L 4 cylinder engine: Remove the (4) 12mm bolts from the decorative plastic engine cover. Remove plastic cover from engine and place it off to the side out of your way. Standing in front of the car, the (4) spark plugs are located laterally (left to right) in the recessed area underneath where the plastic engine cover was removed. Note: This engine has (2) coils....They are located above spark plugs number (2) and (3) from left to right. Starting with the fist spark plug on the left: Remove the spark plug cable by pulling straight up on the insulated connector. Using a spark plug socket, remove the old spark plug and install a new one in it's place. To access the second spark plug from the left, remove the electrical connector and the spark plug cable wire from coil number (1) and then remove the (2) 12mm bolts that secure the coil to the engine. Spark plug number (2) is located directly under the coil. Lift the coil straight up removing the insulated connector from spark plug number (2). Using a spark plug socket, remove old spark and install a new one in it's place. Repeat same procedures for spark plugs number (3) and (4). Note: If you have the (6) cylinder engine, the front (3) sparks pluge are readilly accessible but in order to access the (3) rear spark plugs, you will have to remove the intake manifold

To locate and change the (4) spark plugs on a 2004 Hyundai 2.4L 4 cylinder engine:
Remove the (4) 12mm bolts from the decorative plastic engine cover. Remove plastic cover from engine and place it off to the side out of your way.
Standing in front of the car, the (4) spark plugs are located laterally (left to right) in the recessed area underneath where the plastic engine cover was removed.
Note: This engine has (2) coils....They are located above spark plugs number (2) and (3) from left to right.
Starting with the fist spark plug on the left: Remove the spark plug cable by pulling straight up on the insulated connector. Using a spark plug socket, remove the old spark plug and install a new one in it's place.
To access the second spark plug from the left, remove the electrical connector and the spark plug cable wire from coil number (1) and then remove the (2) 12mm bolts that secure the coil to the engine. Spark plug number (2) is located directly under the coil. Lift the coil straight up removing the insulated connector from spark plug number (2). Using a spark plug socket, remove old spark and install a new one in it's place.
Repeat same procedures for spark plugs number (3) and (4).
Note: If you have the (6) cylinder engine, the front (3) sparks pluge are readilly accessible but in order to access the (3) rear spark plugs, you will have to remove the intake manifold.


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