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Rough idle

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Old 07-14-13, 02:09 PM   #1
carl1989
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Default Rough idle

When I stop at a light I feel a very rough idle from the engine for about a second. This has happened a few times already. Everything about the car is fine, but every now and then I feel the engine rumble after I come to a full stop. Is this normal V6 vibrations?
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Old 07-14-13, 04:07 PM   #2
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Sometimes the RPMs can drop once the radiator fan kicks on.
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Old 07-14-13, 05:20 PM   #3
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Sounds like it could be the carbon build up issue. Do you have a 250 or 350?
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Old 07-15-13, 10:51 PM   #4
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Quote:
Originally Posted by VTsuckah View Post
Sometimes the RPMs can drop once the radiator fan kicks on.
It could be that...

Quote:
Originally Posted by bob4256 View Post
Sounds like it could be the carbon build up issue. Do you have a 250 or 350?
I have an is250. only got about 55k miles on the odo. Is there a thread about the carbon build up issues?
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Old 07-16-13, 04:49 AM   #5
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Quote:
Originally Posted by carl1989 View Post
It could be that...


I have an is250. only got about 55k miles on the odo. Is there a thread about the carbon build up issues?
Yes sir. Two threads, one about the problem and another about how Lexus is trying to fix the issue. Search for carbon build up and both should pop up
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Old 07-18-13, 12:00 PM   #6
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With the recent heat wave in our area, this same rough idle has occurred a handful of times, under the almost identical conditions as the OP. Prior to this heat wave, it didnt occur. Looks like I will be reviewing the carbon build up thread.
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Old 07-18-13, 12:09 PM   #7
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I would also add that I started my engine and got going, then lost power while I was driving. Check VSC and engine light came on. Pulled over and restarted the engine and the problem never showed up since then. This happened earlier this year.
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Old 08-29-13, 12:53 PM   #8
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time to change the spark plugs.
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Old 09-01-13, 10:34 AM   #9
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Pull out your mas air flow sensor Spray some carb cleaner on to clean it out. Fixed my problem on both my ISF and is350.
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