Spark Plug changeout after 30K How do they look?

The top set are Denso plugs and the bottom are NGK. The Denso's gap was between .043 to .045 whereas the NGK's looked a little more worn. They were between .047 to .055. Notice the dark what looks like oil on the threads. Is this normal? My mileage and everything seems normal. I typically get between 17 to 18 mpg (4X4). Also about what mileage do any of you use Seafoam?

 

They look just fine. As usual these days, our vehicles run pretty lean, so they're quite light colored, but they're all the same. No problems that I see. The gaps will likely be wider than they should be only because there's 30,000 miles on them. Good to go, man. Put in some fresh ones and truck on.....

 

Yeah, I just think it's funny that Toyota used Denso on one side and NGK on the other. It looks like the Denso's held up better. The gaps didn't wear like the NGKs did.

 

I confused the service guy at toyota today by telling him that toyota uses different brands on the same block.

 

My 05 had different plugs also, it's prob to be able to keep the account, where some of their other cars use NGK plugs only and others denso. Also by having more then one supplier it gives toyota bargaining power

 

I don't think anyone really knows why Toyota does that. I sure don't. I've used NGK plugs for 25 years and had great luck with them. Although I put in the laser platinums, I will probably use the iridiums next time, just to get a bit of added mileage. I think the platinums should run a good 50,000 before needing to be changed out.

Here's what I recommend:

NGK Laser Platinums:7654
NGK Iridiums: 6619

 

I agree with this suggestion

 

Sweet Jesus

 

Looking normal. changed out mine at 60 k. the spark plugs closest to the firewall action of fair amount of oxidation and fouling. yours look great

 

just kidding



you are gtg

 

just use the correct plugs. Trust me............................................................................................see......................

 

looks good almost look like a tasty marshmellow

 

I just changed my spark plugs as well and also had results similar to the OP.

OP did you note the location of the plugs (forward or aft end of block)?
The plug with most residue on the threads was the NGK on the driver side closest to the firewall. I'm curious if that side naturally gets the most blowby gasses fed to it's cylinder.


Anyhow, these are the pics I snapped when changing the plugs:



And not to cause any unjust worry, but I originally used a rotary type gauge to gap the plugs but measured it with my calipers after and found it to be up to .005" (5 thousandths) too large. So I used a feeler gauge to regap them. So if anyone recently changed plugs and gapped using a rotary type gauge, measure the thickness with a caliper if you got it.

Cheers,
NM

 

OP did you note the location of the plugs (forward or aft end of block)?
The plug with most residue on the threads was the NGK on the driver side closest to the firewall. I'm curious if that side naturally gets the most blowby gasses fed to it's cylinder.


No, I did'nt think about that till it was too late. I did find it interesting how the NGKs wore more than the Densos. I look forward to seeing how these do this time around.

 

I did mine not too long ago, and also found the driver's closest to firewall was the dirtiest. It worried me a for a little while, but then read someone here mention the same thing a couple times, so it sounds normal.

 

Are you all replacing the original plugs with identical plugs (NGK & Denson) mixture, or are you all using 6 of the same plugs? If so, what plugs are you using?

 

FWIW, probably already been posted, so this could be a reminder.

Toyota states in the manuals for the 2010 trucks with the 1gfr engine that the plugs need to be replaced at the 30000 mile maintenance to maintain your emissions warranty.

A few weeks ago I replaced the spark plugs in my truck. These were the originals and had 18000 miles on them.

I installed the Denso Iridium Power plugs. These are a fine wire, 30k mile style spark plug. The V6 took IKH20 series plugs. These are the same that URD sells.

PK

 

I just went up to a dealership and asked for plugs for my truck, they gave me 6 Densos, so that's what I used. They actually have them for a decent price there too.

 

I posted these pics on 9-28-11 with my 30,000 mile report:



Here are the NGKs:


Here are the Densos:


I was disappointed that the new plugs did not improve the gas mileage at all... ie. no change.

 

Not surprising at all. From the looks the engine was running perfect. My father put 180k on his 98 before I changed the plugs. He just never thought about it. That actually did make a difference. Those were dual electrode plugs and the centers were actually oval. I put plugs in my older carb equipped vehicles every few years but properly running fuel injected vehicles (especially with COP ignition) really don't need very frequent changes.