Cracked coil plugs

So as part of the maintenance I'm doing on this new to me truck with 173000 miles on it, I was taking the spark plugs out to inspect them and found them to be in really good condition. However, all eight of the coil packs had cracks in them, some minor some of them going down the entire length of the coil. What brand do you guys recommend?

 

@Professional Hand Model can help out I’m sure

 

Was the truck misfiring at all? When you say cracked, are you referring to the rubber boot?

Personally, I would rebuild them with boot kits and replace the plugs and see how it runs. If they start causing issues, replace.

 

No the truck was not misfiring. And no it's not the boot that's ripped it's cracked down the entire length of the coil. The rubber boots are in good shape actually.

 

Can you snap some pics? Again, personally I would run them if they weren't causing any issues. If money is no object, replace them all at once or replace 1-2 at a time till they are all done with factory Denso OEM coils.

 

Denso Coils are what I installed after seeing half of my 8 OEM originals have the same cracking problem.

For 2002 V8 4.7

BTW, only near breakdown ever in 20 years of ownership was from a bad cracked coil. I was able to limp home. Replace them all if cracked! Read the reviewers and believe them.

Read the reviews on Big Gurrl from Brasil. All types of Toyota owners say to buy these instead of the cheap China knock offs. They are about $55-60 each. Part number in picture below.

Do not fall for the fleabay Toyota China counterfeit knock offs for $20 each. Beware!

 

https://www.summitracing.com/parts/msd-82218/year/2006/make/toyota/model/tundra

I was thinking about picking these up.

 

Ultimately, this is going to be your decision.

 

Yeah I think I better just get the Denso OEM. Can't go wrong with those.

 

Don’t forget to shop around to see which vendors carry that same product and use coupon codes!

 

I’m kinda scared to go to big gurrl..... but if hand model has had good luck, I’ll try it.
These were mine, all on the passenger bank, just as you’ve described. Some micro, some the length of the mold casting line

 

I agree. Those other ones were $320 with 2 reviews. Sketchy word-smithing in the description designed to deceive. Pointing to like China mades. Beware!

Densos only $140 more for the peace of mind.

 

Do t forget TRD sparks has discount codes for forum members

 

Do you have a part # for the boot kits. Not seeing anything on Rock Auto or Toyota OEM parts websites

 

https://www.oreillyauto.com/detail/.../4384654/2000/toyota/tundra?q=coil+boot&pos=1

When I changed my plugs, one of the boots got stuck on the plug. I had to use a o ring to remove it but it ripped the boot. I used this to replace it.

I admittedly, never checked for cracks but don’t recall seeing anything.

 

When you polish your coil plugs every other week as according to @bmf4069 you’ll never run into this problem of sticky boots.

 

Found this thread, looking for some best gen advice.
Changing spark plugs on my wife's 04 Sequoia for routine maintenance. 139k miles, no CEL's.
No.3 cylinder coil pack boot is discolored with small cracks at the very end, also the same plug was only hand tight.
No cracks anywhere else in the coil packs.
Everything is back in with new dealer plugs and running great.
Ya think I'm good to go or should I replace the boots?

Side note, the plugs from the Toyota dealer were made in Indonesia, not Japan. Normal?

 

If you can get just the bottom rubber pieces, I would. That's a lot of voltage to contain and those cracks won't help. If not, you're looking at $40-50 per coil.


Oh, also:

 

I replaced all of mine at 150k miles after deciding to keep the truck a few more years. Had one go bad at 120k miles and was able to limp home. Only time she scared me. Reading up on these: All the 4.7L Land Cruiser guys that did piece meal over the years on theirs wished they had just gone to the Denso Store on the too big website and just replaced them all at the same time. Some guys went cheap chynese and their coils failed in 2-3 months.

Everything I’ve purchased from Denso Store has been flawless. I use NGK Copper Coil plugs that cost about $2 each. Not sure where they are made.

Maybe just keeping what you have until one coil goes bad and then replace all with new. Those little boots cost $$$ and look like a waste compared to buy all new coils when its inevitable.

 

What kind of plugs are they? I just ordered some from Toyota too so we’ll see if mine will be from Indonesia (I’m leaning toward yes)

Where do you source yours from?


I’m a little scared to see what the plugs look like considering the prices on Toyota’s site.
But Denso is half that on places like RockAuto

 

Appreciate it!
Do you get a miss fire code when they go tu or do you have to dive down a rabbit hole to diagnose the coil packs?

 

Post back when you get your plugs, for shits n gigs.

 

Will do. It’s the same stock number. $2.11 each

Ah after a quick search, they’re copper. Toyota website says nothing so I needed some confirmation and still cheaper than Amazon. Thanks!

 

Loose spark plugs seems common on our trucks. Mine are always looser when checking them well after 3-5k miles after they’ve been put on tightly.

 

Rock Auto replacement Boot set

https://www.rockauto.com/en/moreinfo.php?pk=10958236&cc=1426935&jsn=439

Rock Auto Denso coils

https://www.rockauto.com/en/moreinfo.php?pk=2140934&cc=1426935

 

It's tough to beat Summit's pricing, especially during holidays and days of remembrance. They do so much volume they can sell for little to nothing above their cost every day. Only time I ever beat them is when Advance Auto is doing their 25% off coupons and it's not a holiday.

@Cody06tundra I'm curious about those MSD coils. I've always had great experiences with MSD stuff the last few decades, the price will come in cheaper than OEM and coming from a name-brand company who'll stand behind their product. I'd give it a go. If you can wait until Veteran's day, they'll probably have a sale, but sign up for their catalog and email newsletter, they'll send you periodic codes. Sometimes the code ALWAYS will get you 10-15% off.

 

@NWPirate finally got some parts in. Guess the dealership didn’t feel the need to notify when my order arrived.

 

Well, that was sure nice of them.
I see Indonesia on the box too, Japan must be done making these plugs.

 

Of course. I think I’ll go to the other dealer now.