Clay Easto

Would running fuel system cleaners such as Techron help eliminate/prevent the carbon build up?

llamaboiz

i only use chevron gas (since day 1), it has techron already in it... if you dont have a chevron near you, normally any teir1 gas company will be fine.

raptor22

Here's a thread over at the IS-F section on DI (direct injection) which seems relevant to this thread, in case someone hasn't seen it.

https://www.clublexus.com/forums/is-...injection.html

This should only be a problem with the 250. Unlike the 350 and IS-F, the 250 doesn't use port injection, so it could suffer from the DI-only issues.

Infra

iTrader: (1)

No, because the fuel never touches the intake valve stems.

trixxx519

iTrader: (14)

can somebody guide me as to how to put rinse it out with water? lob was talkin about it on the other thread in the is-F section but im not too good with engine terms, pictures would greatly help

suicidesam

good thing i didn't buy some weak a$$ 250...lmao

XhyDra

iTrader: (8)

I have to apologize for not inputting any more information on my first post, it's been a hectic beginning of the year for me. I have had a chance to speak to a few trusted Lexus master techs that I'm friends with, and from their encounters they do log many IS250's with a lot of carbon build up, and exhaust valve replacements. Witch do not make anything any better, they basically fail to fix any problem. As I attain more information from them on this particular issue I will add it to my list of things to add to my first post. I'm terribly sorry on timing but soon I'll have some info to digest.

One last thing to add, this issue does not exist on IS350's or IS-F's due to their combo of DI / Port. So WOT for IS250's can help but there's more to fixing this problem, then letting it eventually cost you large amounts of money to fix.

shui3000

wait, exhaust valves? i thought the problem was the intake valves

is250gurl

i took my is250 in two days ago again for my complaint about rough idle and occasional studder and shake while at a stoplight. explained to them that it seemed like it was about to stall once in awhile. it has happened 6 times since in the last 20k miles. i am now at 45k so i thought it was a bit early to be having this already. i always use premium gas and the good stuff.

strange thing is the car has never thrown any codes and no lights ever come on on the dash during this. i was told that this is a new known issue with this engine and that lexus has a new machine to take care of this. no longer are they only cleaning the throttle body with a spray cleaner. it is now an induction service with an induction kit. i was told it will happen again in time as carbon builds over time and it will need it again then.

the car idles smooth now and it's no longer as sluggish. we will see if the studder is gone in time, but the head tech is sure it will be.

2slow

iTrader: (5)

Was this process free for you? Which dealership did you go to?

is250gurl

yes covered under warranty and it was in orlando, fl. something tells me this is something they are all hearing about now.

l3xuz

so that stop the slight vibration on car if you have your car on park.cause is250 are known for that slight vibration or shaking.

Pnuge88

iTrader: (1)

The problem only occurs right when u come to a stop. The car suddenly drops in rpms and feels like it almost stalled. Then the rpms will rise back to normal. Happens for a quick second

this is quite interesting that lexus took care of you. I've yet heard of anyone making a solution for this little problem. Think im going to do a FIS to my car now with BG products

JDKane527

iTrader: (10)

Have never had this problem, but then again I'm only at 31,000 miles. Which gas station do you usually go to? I've only had Chevron gas in the tank for every fill up.

trixxx519

iTrader: (14)

what if my 3year warranty is over?