Hi,
Is it just straightforward, as to buy spark plugs and adjust the gap and change it? Do we need to adjust the engine timing too?
Ashutosh

I just change the plugs using OEM replacements. The gap is preset but I still check and confirm gap is still correct. You can change the plugs without taking the intake off. A flex head rachet, 16mm spark plug socet with a flex head and several 4 inch and six inch extension will make this project simple. Go in from the left (passenger side), you will need to remove one or two vacuum hoses to clear a path for your arm. Have engine cold because you will laying right up next to it.

You will also need a big plier to help pull the wires. I also used spark plug anti-seeze.
Don't check the gap if you buy OEM parts, it's not necessary and harmful.

I agree with using anti seeze on each plug. Pliers should not be necessary. You will have individual coils to to each plug held in place with a 10mm bolt. Remove bolt and pull coil up off of plug and lay it out of the way. Do one plug at time, replace coil and go to next plug.

You guys are good.. I agree with all of the advise, well probably not the big pliers :), but good call on the anti-seize, I always use it on plug threads or anytime there is aluminum on iron/steel or vise versa. The dissimilar metals (aluminum head and steel - plug) or any steel vs aluminum can fuse together over time. They actually become as one.. this would be very bad lol. The anti-seize will prevent this.

The only thing I can offer in this post is to be very careful not to overtighten the new plugs into the aluminum threaded plug holes, aluminum is very weak.. tighten just snug. Also dont cross thead them.. they should screw in quite a ways very easily before it bottoms out, if they bind prior to bottoming out where they should, back out the plug and screw it in again. You would be surprised how many people do cross thread the plugs or over tighten them.

You can use a peice of 3/8 inch fuel line from the part store that is about six inches long, push the end of the plug onto the hose and then thread it into the plug hole, this really makes threading them in easy.

One last thing, always check the plug gap when using a regular spark plug as they are not usually gapped correctly.. I am not sure about the OEM plugs.. and those fancy expensive plugs, they are usually preset.. they have really thin porcoline (sp) and or electrode or both, you can tell by looking at them which type they are. Gapping those type plugs do damage the plug.

I have tried about every plug there is and seem to keep going back to good ole Autolites, AC Delco is my second choice.

Hi,
I looked at autolite spark plugs they have 2 types platinum and double platinum. The V6 engine only takes platinum ones. They last for about 60K miles. Do you think there is any difference in platinum and double platinum? There are also irrdium plugs, but they are 13$ a pice as opposed to 4$ for the double platinum.
Ashutosh

I would contact your toyota dealer and provide them with your engine type and ask their price for the correct plugs. In my area, replacement plugs from the dealer fell between the two prices you quote. I believe performing a search on this forum you will find some posts about plug compatablity with certain engine types.

What I did is go to the dealer and buy some plugs. I think we are saving a lot by DIY, so use the best parts. My plugs are $9 each.

go to autozone and buy NGK will do you good.

NGK or Denso..Platinums good, Iridiums better.
Personally, not so good luck with Bosch.
Autozone not a bad place to buy. And they will tell you the right kind to use.

Invest in the sockets and extensions, anti-seize and keep an open day with no appointments just in case. Also some neosporin for the skin loss. lol