Lexus IS250 4GR-FSE Engine Carbon Build-up (merged threads)
10-05-11, 05:03 AM
#556
lobuxracer: I follow your explanation on why EGR reversion contributes to this problem, but how will changing the piston rings correct the problem? As you pointed out, the EGR flow is controlled by software and valve timing. It seems like they would rethink the EGR, not the piston rings.
10-05-11, 03:39 PM
#557
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lobuxracer: I follow your explanation on why EGR reversion contributes to this problem, but how will changing the piston rings correct the problem? As you pointed out, the EGR flow is controlled by software and valve timing. It seems like they would rethink the EGR, not the piston rings.
10-05-11, 07:05 PM
#558
Lobuxracer: If wear attributed to fuel dilution is the reason owners are getting piston rings, then the great majority of owners should not need this procedure... and it can't be the cure for carbon buildup. All UOAs for this engine show it is very easy on oil. It must have been the very first buyers who were affected by fuel dilution.
10-05-11, 09:07 PM
#559
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The LSB for the piston replacement says be sure the reflash LSB has been done. Apparently there is a concern large enough for Lexus to specify this as a first step.
10-06-11, 12:46 AM
#560
>>I also wonder how effective the BG direct injection induction cleaning service really works in our engines. Like others I am not excited about my engine being torn down by the dealership.<<
I am not sure about that either, but I will tell you that I am a believer of the BG-44K product now.
For over 6 years my RX idled horribly and Lexus said "thats normal". All high mileage RX are like that.
I tried techron, gumout, etc all these years but no effect.
Earlier this year I purchased the expensive BG-44K and poured it in the tank of my RX.
Voila! The vibrations are gone.
I am not sure about that either, but I will tell you that I am a believer of the BG-44K product now.
For over 6 years my RX idled horribly and Lexus said "thats normal". All high mileage RX are like that.
I tried techron, gumout, etc all these years but no effect.
Earlier this year I purchased the expensive BG-44K and poured it in the tank of my RX.
Voila! The vibrations are gone.
I hope the BG-44K method works.
My car randomly shakes for 2 seconds when I idle at a light. It's very random. Doesn't happen all the time.
10-06-11, 07:32 AM
#561
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If it were mine and I was out of warranty, I'd try injecting water into the intake first. It's just about free and might reduce or eliminate the problem directly where it exists. BG44K is great stuff - I've seen it do some almost miraculous stuff, but it's going to clean the injectors, not the valves.
10-06-11, 02:04 PM
#562
You know what would work... They should put cleaning fluid or water into something like an IV bag. Use a cheapo orifice to *safely limit* the flow and tee-in at the correct place under the hood. Tuck the bag somewhere in the engine bay, like between the battery and the firewall, and drive hard until it's empty.
*meter is not the correct word there.
*meter is not the correct word there.
Last edited by hades281; 10-06-11 at 02:09 PM.
10-07-11, 01:51 PM
#563
You know what would work... They should put cleaning fluid or water into something like an IV bag. Use a cheapo orifice to *safely limit* the flow and tee-in at the correct place under the hood. Tuck the bag somewhere in the engine bay, like between the battery and the firewall, and drive hard until it's empty.
*meter is not the correct word there.
*meter is not the correct word there.
10-07-11, 07:01 PM
#564
If it were mine and I was out of warranty, I'd try injecting water into the intake first. It's just about free and might reduce or eliminate the problem directly where it exists. BG44K is great stuff - I've seen it do some almost miraculous stuff, but it's going to clean the injectors, not the valves.
10-07-11, 08:29 PM
#565
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10-10-11, 06:43 PM
#566
I am kind of disappointed. I bought Lexus for its reputation of being reliable, didn't want to deal with this design flaw. Now it looks like the best remedy is to buy an extended warranty. This sucks. 
Does anybody know how much extended warranty cost?
Does anybody know how much extended warranty cost?
freeflight: A dealership engine overhaul, which is what the rumors about this TSB allude to, would be big bucks. It's also one of those projects where, depending on mileage, you start saying to yourself... "While you're in there, lets replace A, and B, and C" (things like timing chain guides). Keep in mind that at this point the engine would need a thorough decarbonization. If you pull the valves, you'll put new valve guides, etc, etc.
Lexus is better off doing factory engine rebuilds and just swapping your engine for one redone and tested in a factory setting. Other manufacturers have done this.
Lexus is better off doing factory engine rebuilds and just swapping your engine for one redone and tested in a factory setting. Other manufacturers have done this.
10-10-11, 06:46 PM
#567
Pricing varies based on year, model, mileage, how many years left on warranty, where you buy from, etc.
On a 2010 with a 6-year powertrain warranty you have a long way to go until you have to worry about this.
10-12-11, 07:02 AM
#568
I wouldn't start looking at extended warranties, etc. just yet. We haven't even read the TSB to know which cars may be affected, the reason for the repair, etc.
There is a high-mileage 2IS thread with several owners having cars running well into the 100k+ range.
There is a high-mileage 2IS thread with several owners having cars running well into the 100k+ range.
10-12-11, 01:44 PM
#570
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If you're really worried about it, you can put a restrictor in the hose to slow the water flow, but again, it's really difficult to hydrolock an engine without completely submerging the intake.