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Lexus IS250 4GR-FSE Engine Carbon Build-up (merged threads)

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Old 04-29-10, 12:23 PM   #46
Clay Easto
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Would running fuel system cleaners such as Techron help eliminate/prevent the carbon build up?
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Old 04-29-10, 12:31 PM   #47
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Quote:
Originally Posted by Clay Easto View Post
Would running fuel system cleaners such as Techron help eliminate/prevent the carbon build up?
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.
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Old 04-29-10, 12:59 PM   #48
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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.

http://www.clublexus.com/forums/is-f...injection.html

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is this problem only with the is250, or is this also a problem with the is350?
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.
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Old 04-29-10, 02:49 PM   #49
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Quote:
Originally Posted by Clay Easto View Post
Would running fuel system cleaners such as Techron help eliminate/prevent the carbon build up?
No, because the fuel never touches the intake valve stems.
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Old 04-29-10, 03:19 PM   #50
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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
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Old 04-29-10, 03:35 PM   #51
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Quote:
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This is very important to 4GR-FSE (IS250) owners.
good thing i didn't buy some weak a$$ 250...lmao
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Old 04-29-10, 06:40 PM   #52
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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.
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Old 04-29-10, 09:50 PM   #53
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wait, exhaust valves? i thought the problem was the intake valves
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Old 05-13-10, 05:55 PM   #54
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Default new carbon buildup resolution at Lexus dealerships

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.
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Old 05-13-10, 06:02 PM   #55
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Was this process free for you? Which dealership did you go to?
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Old 05-13-10, 06:04 PM   #56
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yes covered under warranty and it was in orlando, fl. something tells me this is something they are all hearing about now.
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Old 05-13-10, 07:20 PM   #57
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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.
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Old 05-13-10, 07:28 PM   #58
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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
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Old 05-13-10, 07:36 PM   #59
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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.
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Old 05-13-10, 07:39 PM   #60
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what if my 3year warranty is over?
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