05 avalon with 226K and just did 2nd plug change and first coil change on all cylinders. however, can't understand the video comment about not being able to "afford" 3 additional coils. for the money that it cost to purchase the vehicle and every other expense in life and decades of wages, along with the fact that you want to maximize efficiencies and get the very most out of every mile... but for those that are really tight on cash, just pick up a part-time job for 1 week even at $15/hr. then take care of the coils for the last time - its the old axiom, an ounce of prevention is worth a pound of cure, changing all 6 coils in my opinion is smart money and peace of mind.
dont get me wrong, i'm very tight with the buck, probably more than the guy who "can't afford" 3 more coils. i'm a very careful and resourceful consumer with everything and i used this source for my coils, check it out, (
https://www.1aauto.com/ignition-coil/i/1aerk00115?f=506214&y=2005) they come with a limited lifetime warranty - code for we'll replace it for free as long as YOU dont damage it upon installation + most any defective parts issues. in fact, when the 6 coils arrived, 1 had the gasket that was not properly seated, so i called and they sent a free replacement, no questions, no charge, no shipping cost.
what prompted the coil change was the "P" code on #6, and i'm glad i changed all because the benefits are exponential. better gas mileage, 32 highway at 70MPH, 25 city (versus 28 & 21) with careful acceleration, quieter idling, smoother running, rapid and immediately responsive acceleration, improved shifting from gear to gear, but the most amazing was when i turned off car for the evening... before, the hood was always warm and i just took it for normal on a car with 200K+ miles, and now, not even a hint of warmth - i couldn't believe it, i kept feeling the entire hood, maybe someone can explain the
DRAMATIC heat reduction of the hood just from a simple plug/coil change.
later, i also dropped the trans pan to change the filter and clear any debris and metal shaving on the magnets then filled with 4qt of the recommended WS fluid, but ironically, after my "restraint of trade" conversation regarding toyota NOT listing an equivalent fluid in the manuel, my local toyota dealership guy said that they use the valvoline product for their needs. i still purchased the WS product. (because of my 1 week PT job, LOL!) why not use valvoline? i just had greater confidence in the reward of the WS over the risk of the valvoline product, $12 more in product versus thinking that if something goes wrong i have the confidence to rule out the trans fluid, but i'd be interested in opinions/experience/use of an equivalent trans fluid...
finally, i've dropped in a pic of the removal of most all of the significant parts for a clean plug/coil change (a 4 hour job vs. a 3 hour job); and also for the satisfaction of reviewing any parts for which i can diagnose and replace something that is worn/damaged or may become worn in the near term, and so i changed the manifold gasket as a preventative maintenance issue. glad it did...
additionally, i noticed that one of the 4 long screws that held the throttle body in place; that over time and vibration, one of them was broken and not tightly securing the unit, so i just drilled through the same spot and anchored it down with a 3" screw and bolt, hope the pic is useful and "let's go places"