This is how I replaced the spark plugs on my Toyota Tacoma with the 3.4L 5VZ-FE engine. The plugs are due to be replaced every 30,000 miles and you must use Denso or NGK Dual Electrode plugs or you will have misfire issues down the road. We are going to start with the driver's side of the Tacoma Went ahead and picked up an OEM set of spark plugs and spark plug wires Notice the wires on the 4runner are numbered. The new wiring will have the same numbering system. We need to make sure that we replace each wire with its corresponding number! We need to remove some stuff out of the way so we can have room to work with: Removing ground wire and nut Diagnostics plug removal Once these are out of the way we should be able to have full access to the first spark plug wire, tug on it to pull out. Gently. If its stubborn, twist and pull. Work it slowly. Careful not to drop any debris once it has been removed Well need a ratchet and a spark plug socket, an extension is required. Here I pulled out the spark plug Compare with the new ones to make sure we bought the same ones. The used spark plugs look good. Oily, burnt or broken spark plugs are an indication of engine issues. To install the new plugs, I recommend using anti seize lubricant. This prevents the spark plugs from sticking and allows easy removal in the future. (You don't have to use it and yes, the plugs come with a plastic cover and pre gaped) Install new spark plug carefully, making sure it will not cross thread. Tighten snugly. access to the second spark plug Accessing the third spark plug is not so difficult, will need to just push some hoses out of the way I recommend installing the spark plug wiring as you install each spark plug. This prevents mix ups and makes sure that we are installing the right wire at the right plug. Remember the numbering scheme on the wiring! Finalized drivers side Now the passenger side involves a little more work to access all three plugs Removing hose from air box assembly Loosen screws and clamps Revealing the spark plugs..they look different! Notice that the end of the spark plugs wires are different than the drivers side Here, I remove the wiring, careful not to break the retaining clips! Once the two wires up the coils are removed, the spark plugs can be replaced the same manner as the driver's side! Remember to use anti sieze, don't over tighten, and thread carefully! Thanks goes to ramonortiz55 for the write up.
