I think my 2006 lexus is250, might have carbon build up due to a few incidents. First incident happened when i started my car up and the RPM's were bouncing up and down, while the car seem liked it wanted to go and stop at the same time. The next occurance was last friday i was sitting at a light and the RPM's did it again where they jumped up to 2500 RPM's and then went below 1000 RPM's as if it was going to stale on me. The final occurance was when my wife got off of work and the the car started up and the RPM's went all the way up to 7000's and then turned off on her 3 times in a row.

So does anyone have a idea what this could be? I just purchased this car on the 29th of Feb, and it hasnt been 3 weeks and im running into issues.. Help please . Car has 63000 miles and runs smoothly when its not having these issues.

 

Def take it to the dealer you bought it..if its not a Lexus dealer then take it to the closest one in your area...Did you get an extended warranty?

 

Naw i didnt get extended warranty, but i spoke with Lexus this morning and they informed me that i was still covered by the power train warranty, and that if it is carbon build up then its covered under that warranty and will be taken care of at no charge. I just wanted some opinions about it. Maybe it might be something different that i would have to look out for other then carbon build up.

 

on some Is250s there is a TSB (toyota service bullitin) they are replacing the pistons. i dont know if your car qualifies but if u call the dealer they can tell u. or u can private message me and i can run it for u..

 

yo go to the second gen IS section it has all the answers your looking for.
https://www.clublexus.com/forums/is-...hreads-54.html

and definitely get the tsib done under warranty..your covered till 70K

 

Thanks Plmeeker and Mia_lex, the information is very helpful. Now i have a starting point on what i need to do next.

 

yea that's the routine to solve the issue...the TSB usually fix the problem in most cases..don't mean to scare you but i have heard good and bad after the job was done!!

 

I brought my car in saturday because its cut out a couple times, rough idling and when i start the car the RPM jumps up to 3000 which maybe cause by the carbon build up. Still at the dealership waiting to here from them if they found anything.....

 

If you read some of the posting on the thread below you will notice most members complain about the same problems like what you having which is also cause by the carbon build up......

https://www.clublexus.com/forums/is-...d-threads.html

 

Juvi22003, I meet you last thursday at the club meet.. I was the black guy talking to you about your coilovers... The blue on your car looks great.... Let me know how it goes with your car please...

 

^^^ oh yeah thats right i remember, thanks man. Got a call about 30mins ago and they still havent found any issues they are keeping it for one more day. will let u know how it turns out....

 

Thanks bro....

 

Lexus just called me said my car is ready but they couldnt find anything. Im sure once i pickup back the car today things will be the same. But they took notes and if it continues i should bring back in.

 

Yeah I saw your car sitting off on the side when I dropped off my IS.... What rental did u get? They gave me a 2012 es350...

 

i had the RX350, i got it back today and they said they couldnt find any problems with it but they made some notes, need my handbrake to adjust they told me the car was too low to get it on the lift so i just ended up getting an oil chnage.....