How do these spark plugs look after 109k? (1 Viewer)
- Thread starter swild
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r2m
Richard
Have you gapped them? Are they within spec?
They all look quite good, dry and clean, except #8 has a little residue.
They all look quite good, dry and clean, except #8 has a little residue.
With 108K your injectors are unlikely to be flow matched anymore. No. 8 may be getting a bit less fuel and running slightly lean due to some clogging, hence a bit more "cooked" than the other plugs.
108K is the service interval for these plugs, so I'd replace all of them. Then either have the injectors rebuilt and flow matched, or at the minimum, give it lots of injector cleaner. On a UZ it's pretty easy to swap out the injectors; not sure about a UR.
108K is the service interval for these plugs, so I'd replace all of them. Then either have the injectors rebuilt and flow matched, or at the minimum, give it lots of injector cleaner. On a UZ it's pretty easy to swap out the injectors; not sure about a UR.
- Thread starter
- #5
I swapped them out for new plugs.
I removed the injectors when I resealed the timing chain cover and didn't notice anything odd with them or the valves.
I'll try an injector cleaner, though. What do y'all recommend?
You won't notice anything odd visually as there could be a tiny piece of gunk on the inside of a spray hole. If No. 8 providing a few percent less fuel than the than it should, that cylinder will burn leaner and hotter than the others.
If you can have the rig down for a few days I'd pull them and send them to a company like InjectorRX for a rebuild and flow matching. Then you'll know they are good.
If you can have the rig down for a few days I'd pull them and send them to a company like InjectorRX for a rebuild and flow matching. Then you'll know they are good.
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Theres a 3 part fuel service that toyota does that runs the engine with a slow drip of carb cleaner (through the pcv valve I think?). Thats supposed to clean it all out. Desert toy shop here in az charges about $175 for it I think so probably like 750 from Toyota : )
That's probably a Seafoam style treatment that will get most of the carbon out of the intake manifold, intake runners, valves, and top of the pistons. Definitely a good treatment and worthwhile (and you can DIY it for $12 with a can of Seafoam
). But, it won't do much for the fuel injectors. IMO the best way to take care of the injectors is to add injector cleaner to the tank at each oil change. Even with that, they should still considered a wear item and will eventually lose their factory flow match and spray pattern as the seals wear out and gunk gets trapped in them. The gunk can be little pieces of dirt/sand from the tank that won't be dissolved by injector cleaner. I ended up burning a exhaust valve on an old Subaru due to a partially clogged injector (engine otherwise ran fine), so injector problems can cause real issues.FWIW I have Dirty Deeds refurbished and flow-matched 12-holes in my 2UZ. I think the 12-holes are OEM on the later UR engines. It did run a bit better with the new injectors compared to the 15 year-old ones it had before.
Regarding the plugs, interestingly my #1 (Right rear?) also showed some corrosion on the threads and was very difficult to remove. The others were all easy.
FWIW I pulled the original plugs at 250k miles and they looked about the same as yours AND were in spec. I don't think the platinum and iridium plugs actually wear back on the gap very much like copper electrodes.
I've always wondered about injection cleaning.
Would like feedback from someone who actually sent theirs in and a photo showing the before/after flow bench. Many Toyotas with a few hundred thousand miles that seem fine... how much is to be gained?
FWIW I pulled the original plugs at 250k miles and they looked about the same as yours AND were in spec. I don't think the platinum and iridium plugs actually wear back on the gap very much like copper electrodes.
I've always wondered about injection cleaning.
Would like feedback from someone who actually sent theirs in and a photo showing the before/after flow bench. Many Toyotas with a few hundred thousand miles that seem fine... how much is to be gained?
