Jeff Lange

iTrader: (1)

Warranty for this issue in Canada has been extended from 6 years / 110,000km to 9 years / unlimited km as per warranty administration bulletin (WAB) 2086.

Hopefully that helps some people with the issue.



Jeff

chikoo

The easiest way to find out would be to take an affected IS250, give it BG44-K can in the gas tank, and see if the problem goes away. If it does, then it works. Else not.

meis250

Thanks Jeff, that is good news for Canadians. Interested to know what's in the fine print of that WAB 2086

nitrotang

iTrader: (2)

Any word/update on Lexus America issuing the same warranty extension for this issue?

hades281

Though I do believe that carbon in the intake ports and valves is the problem (#1, #2, and #4 being true in my previous post) or at least contributes to the problem, we cannot say with certainty that your statment is true. I would assume the pistons and rings in the IS350 have different geometry due to the change in displacement, and the fuel injection strategy is completely different which could definitely affect the amount of carbon buildup in the combustion chamber.

GDI depends on fuel being sprayed on and reacting off of a specific spot on the piston. A layer of carbon would change the geometry which might result in changes in combustion?

None of us have the resources necessary to apply the scientific method and determine the real, provable root cause(s).

I wonder how much more it would cost Lexus to add D4-S to our cars (reprogram, swap heads and manifold, add injectors - whatever) than it costs to swap pistons and rings and not have truly fixed the problem...?

totalstu

So I got the car back today. Looking at the invoice they noticed major carbon build up. They performed the top engine clean and cleaned all carbon from the valves. They also changed the oil. No issue with the drive back from the dealer to the office and then from the office to home. it's to early to tell though. They did notice a vibration from the rear transmission engine mount and are fixing that under warranty in a couple of weeks.

Glad they have extended the warranty on this as my car will be 6 years old in another six weeks.

chikoo

Is the engine in the 350 a high compression engine too?

Kurtz

iTrader: (1)

Yup, sure is

RONNIEJNZN

'06 is 250 (~108,000 miles) in for brakes n tune up. Noticing its I direct injection I looked for carbon buildup while I had the plenum off for plugs 4 & 6 .Sure nuff it was loaded on the backs of the valves. Reading the top engine clean TSB it cleans the cylinder but not really the valves. I rotated the crank to close the appropriate valves and filled intake runner to just over carbon n let sit till dissolved and blew out with air and rags while spark plugs were out. Put some oil in each cylinder , blew it around lightly and reassembled. After some smoke and a little noise runs great. P.s.. make sure no liquid is left in cylinders except for a thin film of oil . No puddles. You'll wreck your motor .

seouljahon

iTrader: (1)

i just had my whole bottom end replaced for free. car runs awesome now, i was just having minor issues but a friend hooked it up at lexus

nitrotang

iTrader: (2)

Which Lexus is that?

KINETICS

^^^^^ yeah interested in that too! Bay Area hopefully...^_^

ddhleigh

So I just got this done due to the rough idle issue. Now I don't know if I was lucky or if the dealership (open road lexus richmond) was just doing their job right. I booked an appointment for them to check the car.

The tech took my car for a drive with me in the passenger seat. I explained the issues and just mentioned rough idle at lights and stop signs once in awhile. I never mentioned any error codes popping up. Went back inside and the SA asked the tech what was up, He mentioned rough idle and to check for TSB's.

Booked an appointment 1 week later, got a courtesy car for 2 days because "they wanted to make sure the job was done right".

Top engine clean done plus oil + filter change. No questioned asked. Excellent service.

Orozco27

iTrader: (2)

so if you WOT a few times a week does it helps the chances from not getting carbon build up?

SpookJr

I got the CEL/VSC light awhile back and autozone scanned it as p0051 A/F O2 sensor bank 1 sensor 1. So I went and bout the the O2 sensor and replaced it but the CEL/VSC is still there. I have experienced the rough idle numerous times so maybe the CEL/VSC is triggered by the carbon build-up but throwing an O2 sensor code?