Just checked my plugs after a 3 year hiatus in doing so. All six were tight. Still never a problem with #5. I'm not going to check them again.
Do you check them all? Or do you know your car well enough now to just do that one? I was really surprised to see my #3 loose also.Annual spark plug #5 check today, after 12 months with Denso Iridium TT20 plugs. It was a couple ft-lb loose. Re-torqued. Took just 5 minutes, all good.
Great suggestion! Id go with this route first before paying anything.I'd call Honda corporate and tell them about the problem and see if you can get them to pay for it. Since it's not far past the powertrain warranty and serious engine work shouldn't be needed at less than 70k miles. Tell them you purchased many hondas and are a loyal owner. If they can't pay the whole thing see if they will pay 50%. But my goal would be 100% coverage. Be nice yet firm.
If HC thinks you have a case they'll open a case file and communicate with the dealer. This has happened a few times with this engine and has been reported at least 3-4 times on here.
Check this thread out:
Sparkplug threads stripped in head.
bad spark plug hole
2005 Honda Accord LX 3.0L 6cyl coil
Thought of a Helicoil repair?
How to Repair Stripped Spark Plug Threads: Auto Clinic
Thought of a Time-Sert repair?
+ TIME-SERT® SPARK PLUG THREAD REPAIR KITS + spark plug stripped thread repair kits for spark plug problems, thread stripped spark plug repairs in damaged threads in spark plug hole stripped out approved thread repair, aluminum head spark plug repair
They coat the drill bit with grease so that aluminum chips don't fall into the cylinder.
I tried the Helicoil five years ago on a lawnmower engine just to try it out- works great. Never tried it on a car engine.
This can be a job for an independent shop....much cheaper than the dealer SHOULD the dealer refuse to help you. The dealer may only recommend replacement. An indy can swap in a used head for $800 or can even try a Helicoil repair or Time-Sert repair for a few hundred bucks.
BTW, THIS is why some mechanics suggest removing your spark plugs every couple of years and re-coating them with anti-seize.
I would not torque that to 24 ft-lb, unless you are asking to helicoil the head yourself.
The truth of this problem, as I've been reading this for over 13 years, this problem spans to the old CL, TL, Honda Odyssey and other earlier J-series engine. Honda had a problem with a tap at a machining plant, but by the time they found out, it was too late. That #5 loose spark plug is caused by that tap that's off by just thousands of an inch.
Honda V6 engine cylinder numberingI had the same problem with my 5 spark plug @ 240K , I am the second owner purchased ODY at 195K, I got the flashing engine light after I hit a bunch of truck tire remains going 60MPH the engine started knocking, would not accelerate right . I got the codes forgot which ones flashed, I assume the previous owner changed out the sparks at 105K, I changed out all 6 spark plugs the front 3 all were great , the rear three 4,5,6, were less so 4 & 6 were slightly more worn than the front three, Number 5 was the culprit it had thick hardened deposits on it which probably cracked loose when I struck the object . I replaced all and the codes were gone and the engine ran normal, 30 Ks later on Valve cover gasket work on removal the 4-5-6 were once again more corroded than 1-2-3 , but number 5 was once again the worse, it had oil in the well , more carbon buildup , and it was loose. I cleaned up the rear 4-5-6 and swapped them to 1-2-3 . I torqued 5 down very tightly . But on a high mileage vehicle those gaskets harden , and spark plug seals harden , I had to use a flat head screwdriver and hammer to remove them from the valve cover. The rear sparks are easy to access so check them occasionally if concerned.
Yes mine runs solid but I made an error I put in some AT-205 a supposedly good stop leak additive , after about 150 miles the codes came a flashin ! Now I will have to replace an oil pressure switch. The 5 plug is notorious in VTEC land I check that plug every 15K inspect clean and reinstall. Also change out your Tranny fluid if dark red or burnt smell . I do the 3X every year .Same thing happened to mine. #5 came loose and stripped the threads. I ended up taking the chance of inserting a helicoil since I already had over 230k miles on the vehicle. Its been solid since! No issues.