Time for plugs...Which ones?
- Thread starter Presta24
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snhrph
New member
I installed Autolite XP Iridium about 2 months ago. So far I like it. I have not had any problems starting the truck in the cold. Also, I noticed that the engine sound changed a little, it became deeper, more raspy, I guess... I like it.
03_4x4Runner
Senior Member
I am not sure which plugs were stock but if you got to 100k with the originals I would stick with that.
Doozi
New member
Plug change observations
Changed the plugs today and can only assume that the originals were still in there... 3 Denso on the passenger-side and 3 NGK on the driver-side. Mileage was 71,686. The manual says the spark plug gap should be 0.043" and the Autolite XP Iridiums came out of the box at 0.044" so I just left them that way.
These are the plugs that came out and their gaps...
> Denso (on the left, top-to-bottom): 0.054", 0.053", 0.053"
> NGK (on the right, top-to-bottom): 0.060", 0.060", 0.060"
The picture shows the plugs in the positions that they were in in the engine...
Can't really conclude too much from this, but a couple of observations would include that the NGK plugs look to have been consumed a bit quicker than the Densos and maybe the two rear plugs (top in the picture) get the hottest. Also, they were pretty tight and "squeaky" coming out so I used a bit of anti-seize on the new ones.
~Doozi
Changed the plugs today and can only assume that the originals were still in there... 3 Denso on the passenger-side and 3 NGK on the driver-side. Mileage was 71,686. The manual says the spark plug gap should be 0.043" and the Autolite XP Iridiums came out of the box at 0.044" so I just left them that way.
These are the plugs that came out and their gaps...
> Denso (on the left, top-to-bottom): 0.054", 0.053", 0.053"
> NGK (on the right, top-to-bottom): 0.060", 0.060", 0.060"
The picture shows the plugs in the positions that they were in in the engine...
Can't really conclude too much from this, but a couple of observations would include that the NGK plugs look to have been consumed a bit quicker than the Densos and maybe the two rear plugs (top in the picture) get the hottest. Also, they were pretty tight and "squeaky" coming out so I used a bit of anti-seize on the new ones.
~Doozi
Doozi
New member
Yeah... I've read that they come from the factory like that! Don't know why, but maybe someone can chime in.
~Doozi
Uneek
Super Moderator
Some have speculated that Toyota has a 50/50 agreement with both Denso and NGK for plug usage. So the best way to ensure the agreement is upheld is to use half and half in every engine.
Koz
New member
Changed the plugs today and can only assume that the originals were still in there... 3 Denso on the passenger-side and 3 NGK on the driver-side. Mileage was 71,686. The manual says the spark plug gap should be 0.043" and the Autolite XP Iridiums came out of the box at 0.044" so I just left them that way.
These are the plugs that came out and their gaps...
> Denso (on the left, top-to-bottom): 0.054", 0.053", 0.053"
> NGK (on the right, top-to-bottom): 0.060", 0.060", 0.060"
The picture shows the plugs in the positions that they were in in the engine...
Can't really conclude too much from this, but a couple of observations would include that the NGK plugs look to have been consumed a bit quicker than the Densos and maybe the two rear plugs (top in the picture) get the hottest. Also, they were pretty tight and "squeaky" coming out so I used a bit of anti-seize on the new ones.
~Doozi
I had the complete opposite happen when I changed my plugs (at 50K miles). The NGK's were like new and the Denso's looked half used. This was on a supercharged 3.4 V6.
Koz
galactic_04
New member
I just finished putting NGK Iridiums in mine tonight.
I have 100,300 on it now and guess what? 3 Deno's and 3 NGK's in it when I pulled them out! It really wasn't bad, but on the driver's side we had to pull one vacuum line when we did the driver's side, and have a swivel for the 10mm on the middle coil, but other than that we could just barely get that and the back injector out with a little finesse.
I have 100,300 on it now and guess what? 3 Deno's and 3 NGK's in it when I pulled them out! It really wasn't bad, but on the driver's side we had to pull one vacuum line when we did the driver's side, and have a swivel for the 10mm on the middle coil, but other than that we could just barely get that and the back injector out with a little finesse.
Koz
New member
galactic_04
New member
Honestly, it was pretty even. They both looked about the same. I may be getting one MPG better, but I dubt it made much difference.
sting555
Member
I just hit 59k on my original plugs. Pulled out 3 NGK and 3 Denso. Replaced them with Autolite Iridium XP. Just got the ones that Kragen/Oreilly's had listed for my engine. So far so good. No gap adjustment. Overall a relatively easy job. Removed the intake and engine cover. Also removed the top bolt on the black bracket on the drivers side. From there, the plugs weren't hard to get to.
