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The Metal Boot comes off with the plug wire......as far as removing and installing the plugs,it is pretty straight forward, Just a spark plug socket is needed to remove the plug.....the back plug on the passenger side,back by the fire-wall is the onlytoughone.....its just tight back there.
....The gap of.....0.60 is for the A/C Delco Platinum plugs which is what you Tahoe came with from the factory.......The Iridium plugs should be gaped at 0.40 right out of the box.....Check the Gap to make sure......But do not attempt to re-gap them as the Iridium tip can be easily damaged.....and last don't forget the anti-seize went installing the new plugs.
There will be 6 spark plugs. 3 at the front of the car between the engine and the radiator. 3 on the other side of the engine close to the firewall. You can follow the spark plug wires to locate each plug. The engine is transverse mounted, or sideways. It can be difficult to plugs on this type of engine because of clearance problems. I use a special spark plug socket that is extra long. Instead of using a ratchet wrench, I use a 7/8 inch ratcheting box end wrench on the socket. The socket has a rubber insert to hold on to the plugs after they have been removed from the engine. Be careful when removing the spark plug wire. They get stuck on the plugs, and pulling on the wire will damage it. If you don't have a tool designed for removing spark plug wires, twist the boot, or the big end of the plug wire that slips over the end of the spark plug. Once is is loosened up, you can pull it off the spark plug. Pull on the boot, never the wire. Only remove one wire at a time to avoid getting the wires crossed. To install the plugs, get a 6 inch length of rubber vacuum hose that will fit tightly on the end of the spark plug. Use this as a handle to install the spark plug into the engine. Once the spark plug is threaded in to the engine, pull the hose off the end of the plug and use the socket and ratcheting wrench to finish tightening.
This is a pretty straight forward job though I cant recall if you need to do anything special to reach some of the plugs. You may need a tool to pull the boot off of the plugs. Now is a good time to go ahead and change the plug wires. If the plug wires stick to the plugs hard enough they could break during removal. You will need various length of extensions and a special socket for the plugs to help prevent breaking them. Experienced mechanics often do it with a regular deep socket but better safe then sorry. unplug the wires from the spark plugs makeing sure to keep them in a logical order because they have to go back in the same spot they came out from. If you are worried about messing up here then just do one at a time. Unhook the spark plug wire from the plug. remove the plug. check the gap(these days I notice that most of the new plugs are already gapped to the right spec. but it doesnt hurt to double check) on the new plug. Carefully thread the new plug in and tighten it up. plug the spark plug wire onto the new plug. Move to the next plug, rinse and repeat.
Hello, one of the main mistakes a lot of people make is pulling off all of the plug wires at once. Do them one at a time, remove that plug and replace the wire before moving on to the next plug. Grab the spark plug wire boot, not the wire and give it a slight twist to loosen it. I always start the new spark plug by hand to avoid cross threading. Once the plug is tightened, make sure the spark plug wire is fastened securely. I hope this helps.
The heat shield on the plug wires are there to keep the heat off the wires.I believe they are only on the rear ones.Yes they do come off.They need to be installed on the new ones.There are some special pliers that are for removing the wires but sometimes they ruin the wires.The best way to remove the plug wires is to grab and twist back and forth and out.What happens is the rubber part kind of sticks on the porcelin part of the plug and you have to twist it to break it loose.Hope this helps.Good luck.
The metal tube stays in the heads. They make a special pair of pliers to remove the spark plug boots from the spark plug. You should replace the wires at the same time as the plugs on those models anyway though.