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YOU NEED LONG SPARK PLUG SOCKET. NEED A 3/8 INCH RATCHET WRENCH.YOU NEED EXTENSION.YOU NEED SPARK GAUGE YOU NEED A TORQUE WRENCH. NOT MANDATORY JUST DONT OVER TIGHTEN SPARK PLUGS STRIP ALUMINUM THREADS WAIT UNTIL ENGINE COOL TO KEEP FROM WARPING THE HEADS. SPARK PLUGS LOCATION ON TOP OF CYLINDER HEADS.TO GET TO SPARK PLUGS THE COILS ON TOP EACH SPARK PLUG.HAS TO BE REMOVED BY REMOVING SMALL SCREW.THAT HOLD COILS DOWN.AND CHANGE ONE SPARK PLUG AT A TIME SO YOU WONT GET THEM MIXED UP.GAP PLUGS AT 0.028 - 0.031
LOCATED UNDER THE BLACK COVERS ON TOP OF THE VALVE COVERS YOU HAVE 3 PLUG WIRES AND 3 COIL PAKS YOU HAVE TO REMOVE THROTTLE BODY TO REPLACE THE ONES ON PASSENGER SIDE AND BE CAREFUL NOT TO BREAK THE THROTTLE BODY GASKET AS THEY GET BRITTLE YOU ALSO WILL NEED TO REMOVE THE SIDE BRSCKETS THEY ARE SILVER 12 MILIMETER BOLT AND 1 14 MILIMETER GOOD LUCK
spark plugs are under valve cover. Each plug has its own coil pack module. Plug is under this. Be ware, factory plugs may have to be ordered ( $ 15 - 20 ea.) , depending on parts stores in your area. here in Canada, some stores had wrong computer listings for all brands of plugs for this car!! The factory plugs are NKG Iridium, and are longer than conventional plugs!! I'm about to change mine ( 160000 KM's).Looked at plugs cpl mths ago, didnt look too bad. Hope to get another 160 K's from new ones ! Good luck .!
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
First you have to take off the black plastic cover then you will see the 3 on the front of the engine the other 3 are under the manifold, you have to remove the manifold in order to reach them, I suggest you take the car to a mechanic for this work.