V6 engine problem. Went to replace spark plugs... upon removal one side of engine spark plugs were in great shape, other side engine spark plugs were trashed.. what is problem?

See this YouTube video:
Toyota Avalon V6 DETAILED Spark Plug Replacement

You'll see why dealers charge upwards of $400 for this job!

Hi!!
"V" Type Engines (V6, V8, V10, V12) are divided into 2 BANKS, BANK 1 is the side where spark plug #1 is, BANK 2 is where the Last spark plug is. Usually the #1 plug is in the driver's side of the engine.
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The 2006 KIA Sorento is a smaller SUV with a 3.5-liter V6 engine. This engine uses six spark plugs to run the engine properly. There will be three spark plugs on each side of the engine. All six spark plugs will need to be changed at the same time to ensure that all six are working equally. The spark plugs are in plain sight on the right and left side of the engine and have rubber wires connected to the top of each one.

1. 1 Insert the edge of the spark-plug gapping tool under the meal arm in the center of the one of the new spark plugs and turn the gapper until the number .038 is in the center of the metal arm. Repeat this for all other new spark plugs.
   
2. 2 Open the hood of the 2006 KIA Sorento and remove a rubber wire from one of the spark plugs. Use the ratchet and spark-plug socket to remove that spark plug from the engine.
   
3. 3 Insert the new spark plug into the hole where the old plug was. Hand-tighten the new spark plug until you are certain it is seated properly, then tighten it further using the ratchet and spark-plug socket. Replace the rubber wire to the top of the new spark plug.
   
4. 4 Repeat for all other new spark plugs. Once you have replaced all six spark plugs and replace the rubber wires to the tops of them, close the hood.
   

Is it a V6? For a V6 if you are standing in front of the car it will be the middle cylinder on the firewall side of the engine. You will have to remove the plastic engine cover and the intake manifold to get to it. If it were on the front side of the engine you would only have to remove the plastic cover. Since there is a good bit of work involved removing the manifold, I would suggest that you go ahead and replace all of the sparkplugs and consider replacing the coil for the one cylinder also. I have a 2001 Mazda Tribute. Mine started running rough so I decided to replace all the sparkplugs. After replacing the sparkplugs it continued to run rough. I took it to a shop and got it scanned (no cost for the scan). The scan showed the coil on the 3rd cylinder was bad. So I wound up having to pull the manifold off again to replace the coil :(
The first time it took me 1-1/2 hours to do the plugs, second time 1 hour to do the coil. Car runs great after coil replacement. Hope this helps.

Buy repair manual

It has a maintenance recomendation from the manufacturer for replacement of the spark-plugs at 100,000 miles. You don't list mileage or V6 or L4 cylinder. Make sure engine is cold because the cylinder heads are aluminum and can be damaged if plugs are removed hot or overtightened upon reassembly. Remove spark-plug wires and replace spark-plugs. Sometimes the wires break when you remove them and will require replacement. If you coat the inside of the wires where they connect with the plugs with dielectric grease it will help prevent the wires from breaking upon future disassembly.

Since you didn't state whether it is a V6 or V8, I'll give you both.

V6 -4.3Liter
Firing Order is 1-6-5-4-3-2
Distributor rotor turns Clockwise
Number 1 spark plug tower on distributor cap, faces the front of the engine.

->Drivers side, spark plug order in engine, starting from the Front going back:
1-3-5
->Passenger side, spark plug order in engine,
starting from the Front going back:
2-4-6

If it's Electronic, the distributor cap has a Left side, (Drivers side), and a Right side, (Passenger side)
Starting from the Front, going back on the Left side,
3-1-5
Starting from the Front going back on the Right side,
2-4-6

V8-5.0, 5.7, and 7.4Liter
Firing Order is 1-8-4-3-6-5-7-2
Distributor rotor turns Clockwise
Number 1 spark plug tower on distributor cap,
faces Front, towards the Drivers side.

Electronic distributor cap has two sides. Drivers, (Left), side and Passenger, (Right), side.
Starting from Front going back on Drivers side,
1-7-3-5
Starting from Front going back on Passenger side,
8-2-4-6

Spark plug order in engine, starting from Front going back, Drivers side:
1-3-5-7
Spark plug order in engine, starting from Front going back, Passenger side:
2-4-6-8

You have coil over spark plug ignition and one of your coils is bad.You need to find the bad coil and replace it.

install a fresh set of plugs. make sure to check them for proper gap, even if they are " pre-gapped "


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