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Bumping this thread as I just noticed in my Lexus Drivers' portal that adding the "EFI Fuel Tank Additive" is part of the recommended service. I remembered this back & forth discussion and found it interesting, considering Lexus themselves recommends it.
Bumping this thread as I just noticed in my Lexus Drivers' portal that adding the "EFI Fuel Tank Additive" is part of the recommended service. I remembered this back & forth discussion and found it interesting, considering Lexus themselves recommends it.
My Lexus Owners Manual's Recommended Service does not list the Fuel Tank Additive. Is this something that your dealership is recommending, which is separate and different from the Owners Manual that Toyota/Lexus provides owners? What does the [3] represent?
It's funny that Toyota/Lexus uses the word 'only': Hawaii and Puerto Rico only. If it was eh-okay, they would have recommended the fuel tank additive for all locations, but they didn't...
Apparently so. But mine makes no mention as to select states, as shown in my screenshot.
@bclexus The Lexus Drivers’ site is run by Lexus, not an independent dealer.
There must be some distinction between the two, otherwise the Owners Manual and the Lexus Drivers' website would provide the same information. I suspect, while they are both owned by Toyota/Lexus, different people maintain the material information...and they don't follow service recommendations to the 't'. I'm not so sure the Lexus Drivers' website isn't heavily dealership-leaning while still tethered to the mothership.
On Cadillacforums.com, a senior member used techron fuel additive in a Northstar engine and did a complete teardown of the motor with pics. This was about 9 years ago. The before and after pictures were indeed very conclusive. On the 4.6 liter Northstar teardown, the engine was indeed cleaner after the treatment and driving a few thousand miles. Almost all of the sludge was gone and the pistons were much cleaner. The tread was at least 75 pages long. At the very least, it was a fun read.
I got one of those cheap endoscope cameras that attaches to your phone. First I took a look at my Holden/GM 3.6L V6 Alloytec engine that had 260,000 kilometres on it.... https://photos.app.goo.gl/PxpKB4F2mYg8SBYX8
I got one of those cheap endoscope cameras that attaches to your phone. First I took a look at my Holden/GM 3.6L V6 Alloytec engine that had 260,000 kilometres on it.... https://photos.app.goo.gl/PxpKB4F2mYg8SBYX8
‘Looks like there has been/is some oil seepage at the bottom side of that valve...are the seals going out? Any smoke?
No it doesn't blow any smoke or burn any oil. Remember oil vapour is being introduced into the inlet manifold from the PCV valve. It's only areas receiving fuel vapour from the port injector that is getting any cleaning action. The backside of that valve is in the shadow of the port injector.
No it doesn't blow any smoke or burn any oil. Remember oil vapour is being introduced into the inlet manifold from the PCV valve. It's only areas receiving fuel vapour from the port injector that is getting any cleaning action. The backside of that valve is in the shadow of the port injector.
So, you're saying that only a portion of the intake valve actually receives fuel sprayed by the port injectors - and the injector sprays at such an angle that no fuel (i.e. cleaning action) comes into contact with the valve because the valve stem blocks the spray? That's a new one on me! And, you're also saying that intake valves do not spin or rotate about its stem axis? That's a new one on me too!
So, you're saying that only a portion of the intake valve actually receives fuel sprayed by the port injectors - and the injector sprays at such an angle that no fuel (i.e. cleaning action) comes into contact with the valve because the valve stem blocks the spray? That's a new one on me! And, you're also saying that intake valves do not spin or rotate about its stem axis? That's a new one on me too!
That does not look like carbon on the valve to me. Maybe what the substance that appears partially on one side of the valve is remnants of some type of aftermarket cleaner product, or corrosion or rust. Who knows, but that is not carbon buildup...
A port injection system delivers its fuel load under low-pressure conditions at near atmosphere pressure, and due to the injector's tip location well above the intake valve the fuel mist is allowed ample time to become a vapor before the valve opens. Also, from whence the port injector delivers its payload of fuel the injector is positioned quite a distance from the intake valve itself, well up in the manifold chamber which is about the diameter of the valve. That said, the port injected fuel has plenty of both time and space to cover the entire valve and it is literally impossible to have part of the valve blocked by the valve's stem from receiving fuel. That is just not possible...
That does not look like carbon on the valve to me. Maybe what the substance that appears partially on one side of the valve is remnants of some type of aftermarket cleaner product, or corrosion or rust. Who knows, but that is not carbon buildup...
A port injection system delivers its fuel load under low-pressure conditions at near atmosphere pressure, and due to the injector's tip location well above the intake valve the fuel mist is allowed ample time to become a vapor before the valve opens. Also, from whence the port injector delivers its payload of fuel the injector is positioned quite a distance from the intake valve itself, well up in the manifold chamber which is about the diameter of the valve. That said, the port injected fuel has plenty of both time and space to cover the entire valve and it is literally impossible to have part of the valve blocked by the valve's stem from receiving fuel. That is just not possible...
It's a Japanese import that had 81,000 kilometres on it when I got it. So who knows what fuel it was getting and how it was being driven. It could have easily spent a lot of its life idling in city traffic.
It was also the cylinder furthest away from where the PCV line enters the manifold. I plan to take the inlet manifold completely off when I give the car a thorough 100,000 kilometre service in the next 6 to 12 months or so. It will be interesting to see if things have cleaned up with the use of good quality fuel and the PCV oil catch-can with mostly open road highway driving.
01-14-20, 04:01 PM
