autox250

The 350 does have port injection... there's been a few rare cases when a GR-family engine develops carbon deposit on the direct injection bore. 2GRs run mainly on direct and activate port under certain load conditions. At a dealer your looking at about 5-6 hours of labor to remove upper manifold, lower manifold, fuel rails, injectors etc...
As far as the 250??? I have an 07 w/56k.. I've done the top engine clean in the shop, I had extensive buildup... nothing you can do about it... It's got nothing to do w/EGR, its the PCV system in the car. Down side is, If you plug the manifold port for PCV and you vent it to a breather... you'll get a system lean code on both banks... I did the top engine at 30k, Im going to take it apart again at 60k when I do plugs... this time if needed im running top engine clean & then washer fluid... I will post pics before & after, I've done this to a RX300 w/crazy ping with excellent results

panda327

iTrader: (3)

i'm getting this carbon build up done next week ...
i'm worried after they do this clean up... things may get worst

autox250

nah, the top engine clean wont bring on other problems... while it does remove a decent ammount of carbon buildup, it doesnt do as good of a job on the gunk built up on the valve stems. I can guarantee you that from doing atleast 30 or 40 of these already... I'm going to try a diff method, I hope I can bring you all good results on a home made version of the TSIB

penone

So for the 2nd time I had the blinking CEL, Check VSC, studder problem happen. I had this previously and in the end the dealer performed the "cleaning" under the TSB. I am now at 61K miles (but it is a CPO) and my question is - is this still covered under my warranty since the "fix" did not work the first time or will I need to pay for the cleaning?

600rr05

iTrader: (9)

^^^ take it back to them.. i actually just took mine in today because my car while driving around 15-20 mph just suddenly lost power like it was gonna stall then my check vsc light and check engine light came on. Took it into the dealership and as long as that is the issue its covered by the warrantee of 6 years or 70,000 miles so you should be good but might be different since they have already done it once.

tobyman

i had this problem on my 2007 IS250 happened like 10 to 12 times. took it back to the dealer each time, kept the paperwork. before my warranty expired (when they would they have stopped covering the top engine clean procedure) i returned the car as a lemon.

panda327

iTrader: (3)

anyone with an 09 + with this problem ?

i've had the shudder and the stalling feel a couple of times .. but nothing recent ...

penone

Unfortunately NY does not have that strong a lemon law where I could return the car (afaik). Did take it to the dealer and my SA just called to let me know it was covered and that they were going to change (or maybe clean?) the valves.

Let's see how long this fix lasts.

tobyman

and that was the problem with my car... every time the dealer would do the top engine clean, the issue would go away temporarily. then after a few months or weeks, it would come back. they even replaced the valves on my car but the issue always returned. if you kept ur paperwork and went in multiple times, it might be worth it to speak with a lemon law lawyer just to see what ur options might be.

Thinktwice

Did they have to replicate the rough idling when your car was there or did they take your word for it? I know the problem many have is that its so intermittent that its hard to reproduce on demand. Then what happens is the dealer says they can't replicate it and nothing is done because of that.

tobyman

yep, my dealer did indeed have to replicate it for them to work on it. in my case, lexus would hold onto my car for days at a time and each day would try a few times to replicate it. the problem would eventually occur and then they would do their top engine clean.

modifiedMR

I would like to know who actually has pulled the valve cover to verify the problem and at what mileage? It can also be a problem with auto's and sensors. It's common for auto's to hesitate under certain circumstances due to slow responses. It can also be caused by the ecu going rich/lean going from load to decel. On decel, most newer engines actually cut ALL fuel and use drivetrain to keep the motor spinning.

If it is what many are stating, it is what they call pinging. Maybe many have some kind of vacuum leak?

I cannot imagine a car with 20k having much carbon build-up. Although, the compression ratio is very high and can be causing excessive crank case pressure. I would not suggest nitrous, but maybe install a very small water injection system in the intake? Find the smallest nozzle you can and keep running WI. It cleans good or maybe even a 50/50 injection with methanol. That will stop the pinging, clean the engine and give you a little boost of octane.

I never would have though a toyota would have this problem at such a low mileage. Toyota's trying to be on the cutting edge of efficiency since late 90's, but that causes problems. They used to worry alot more about reliability and over engineered EVERYTHING. My corolla has 243k on it and runs great, even with burning 1/2 quart every 3k. My mr2 has over 240 whp and holds up fine to abuse. Newer cars are just not built the same. They want more mpg and are sacrificing reliability. Toyota isn't the only one doing this.

autox250

Its not sludge, pulling the valve cover wont reveal anything.... they're all clean. It's not related to any sensor, lag, ECU, fuel cut, vacuum leak or pinging. at 20k its not that common but they do build sufficient carbon and sludge behind the throttle plate, lower intake manifold runners and valve stems to cause idle roughness.
The water injection is ideal, but you're totally wrong about the reliability factor. Aside from defective intake cam gears and carbon buildup, there's nothing wrong you can find mechanically with them.. you want to talk reliability??? ask BMW what they're doing to recall all the straight 6's that are suffering from shearing cylinder head bolts..... now thats a damn failure

600rr05

iTrader: (9)

i had this done to my car i think 1-2 months ago and well today out of no where it starts to happen again i am starting to notice it happens when i have the AC on.. gonna call the dealer on Monday but i am really starting to wonder about this car....

jv250

im hitting 18k+ mi starting to get a little lagginess and vibrating while in drive at idle/stopped.

wonder if i should try bringing it in for tsib.