Yet another mixed engine of Denso/NGK's.
- Thread starter Casper
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Casper
New member
toy,
they are iridiums but as with everything in a mass produced car, there are compromises. Toyota is using the lower end of NGK's Iridium line (Laser OE) vs their Premium Iridium (Iridium IX).
I believe that service interval is is something beyond 30K miles....and probably more like 60K.
they are iridiums but as with everything in a mass produced car, there are compromises. Toyota is using the lower end of NGK's Iridium line (Laser OE) vs their Premium Iridium (Iridium IX).
I believe that service interval is is something beyond 30K miles....and probably more like 60K.
I'm not sure if it even is a mod. The only reason I did it is because there was a chance that I could have half Denso and half NGK's, but of course I had no way of knowing that without pulling the plugs. I guess I could've replaced the Denso Iridiums and returned the NGK's and saved myself $60, but what fun would that be??toybox said:
Casper, can you re-assure me that the NGK Iridium IX's are in fact a better plug than the Denso Iridium's?? I can't find a price of the Denso plug anywhere so I don't know if its less expensive or not.
Casper
New member
Price has nothing to do with quality....just look at the OEM laser plugs that are $2.00 more per plug.
I have used both Denso and NGK in past vehicles and I have always been more impressed with NGK than Densos.
Guys I trust to build my race engine use them as well as almost everyone in the racing circles that I reside in.
NGK...better plug.
I have used both Denso and NGK in past vehicles and I have always been more impressed with NGK than Densos.
Guys I trust to build my race engine use them as well as almost everyone in the racing circles that I reside in.
NGK...better plug.
Just an update here:
After driving a couple weeks with the NGK's installed I can really feel a difference in the high end power. It feels like the engine is firing much stronger at these rpm's. It still also sounds louder to me too, not sure if that has anything to do with a better spark or not, but it would make sense...
After driving a couple weeks with the NGK's installed I can really feel a difference in the high end power. It feels like the engine is firing much stronger at these rpm's. It still also sounds louder to me too, not sure if that has anything to do with a better spark or not, but it would make sense...
greasefingers
New member
The only problem with waiting for 120 k miles is if the plug becomes stuck. I plan on removing all of mine this summer for a cleaning, inspection, & lube up the threads. I will most likely replace them at 90 k miles. Which is three times the distance of a standard plug.
Also the cost of the ngk IFR6A11 (4589) is $ 6.84/ea at Rockauto, and this is exactly 3 times the cost of a Champion Truck Plugs, that I use in my Jeep. So are these plugs worth it
Also the cost of the ngk IFR6A11 (4589) is $ 6.84/ea at Rockauto, and this is exactly 3 times the cost of a Champion Truck Plugs, that I use in my Jeep. So are these plugs worth it
4th gen mixed Denso/NGK plugs
I changed the plugs in my 2003 4Runner V-6 Limited 4WD this past weekend and mine were a half-and-half mix also: the left/driver side bank had three NGK plugs, the pax side bank had Denso plugs. Mileage was 30,200 and none of the plugs was really eroded significantly. Biggest gap on any of the six plugs was ~.0036 vice the spec of .0034, so IMHO the original plugs could have easily gone to 40k. I replaced them with Toyota Denso plugs gapped to .0034 and so far haven't noticed any appreciable difference in how smooth the engine runs.
The most difficult part of changing the plugs was removing the wire clip from each of the igniters; those clips just didn't want to come off!
I changed the plugs in my 2003 4Runner V-6 Limited 4WD this past weekend and mine were a half-and-half mix also: the left/driver side bank had three NGK plugs, the pax side bank had Denso plugs. Mileage was 30,200 and none of the plugs was really eroded significantly. Biggest gap on any of the six plugs was ~.0036 vice the spec of .0034, so IMHO the original plugs could have easily gone to 40k. I replaced them with Toyota Denso plugs gapped to .0034 and so far haven't noticed any appreciable difference in how smooth the engine runs.
The most difficult part of changing the plugs was removing the wire clip from each of the igniters; those clips just didn't want to come off!
Re: NGK IX iridium install question
I just hand tightened them with a little bit of anti-seize on the threads. Hand tighten with the extension until snug then tighten an additional 100-120 degrees of rotation with the wrench, so in other words get them in there sung but not too tight, don't want to strip the threads!!!AVincent said:
, spec on them is 66in-lbs. Good luck.
Some1esle
New member
I got one specific reply from the local Toyota Mech.... The coil is just not strong enough to support the Iridium.? I still don't get it since the IX plugs are supposed to conduct better... It was Friday, and he seemd like he had been ridden like a bicycle all week.... So I was guessing he was talking about the quad plugs or something. I've held off installing the quads until I install the super racing grounding plate... I know they are a little hokey, maybe even snake oil type, but I o know that the grounding straps/wires on my 95 are 12/13 years old and were not strong in the first place. I also know that grounding is eccential to proper operation, and I feel like added 8 guage ground9ing wires can't hurt. Especial with all the stereo equipment I have in there... Also, the improved grounding should allow for better flow of the current to the plug, plug to the tip, better detonation, more efficient combustion, and overall more effiencent operation of the engine.
Of course It is very possible that I'm completely wrong since it's happened before...
If anyone has any past experience with either part... Quad spark plugs, and/or the gruonding plate let me know...
Thanks.
Of course It is very possible that I'm completely wrong since it's happened before...
If anyone has any past experience with either part... Quad spark plugs, and/or the gruonding plate let me know...
Thanks.
Casper
New member
Some1esle said:
The coils, while MAYBE being a limiting factor on the truck, should be rated for higher than that of the stock plugs. There are replacement coils (ignitionsolutions.com) but at $800.00+ they are a bit expensive.
I would love to know how this tech knows that it can not handle an iridium plug. Seems fishy if you ask me.
*EDIT* just noticed that you have an older model V6..this information would now make sense.
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Some1esle
New member
Casper said:
Yep, that's true. I opted for the cool looking 4runner and paid cash, as opposed to the Generic looking with V8, and huge note.... Just kidding. I love them all, mostly.
Anyway, It's been my experience that the ignition coils is not an area Toyota spend huge R&D money on, and have always been a little weak on most Toyotas in general. However, I tend to agree that the Mech answer I posted may not be completely correct. I was leaning to the possibility of the grounding being more of my problem.
I asked for plugs at the stealership and they didn't have them in stock. I said I would just buy them at O'Reilleys and the clerk looked at me like I'd slapped her. She told me not to put their plugs in and I explained I could buy NGK's there and the 4-runner had either NGK's, Densos, or a mix of both. Then she looked at me like I was a complete idiot and said they would never mix plugs like that. Needles to say when I changed the plugs I had three of each. No more trips to the dealership unless necessary. Oh, and they also put an extra quart of oil in it for me when they changed it. Way over the fill line. Nice
