Rough idle problem - Scion xB Forum
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#1 Old 12-29-2010, 05:24 PM
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Rough idle problem

When I come to a stop my xB idle's very rough. It dips down to almost 400rpm and nearly stalls before the computer adjusts (I assume) and brings it back up.

Are there any commons problems that would cause this, or should I just go ahead and replace the spark plugs? If so, what are the OEM plugs?
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#2 Old 12-29-2010, 06:33 PM
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Re: Rough idle problem

Old plugs or dirty Idle Control Motor.

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#3 Old 12-30-2010, 12:15 PM
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Re: Rough idle problem

Thanks, will try the plugs first
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#4 Old 12-30-2010, 12:35 PM
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Re: Rough idle problem

I'd do ISC cleaning first. Easier and cheaper. May be clean the MAF sensor too.

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#5 Old 12-30-2010, 01:00 PM
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Re: Rough idle problem

What's an ISC?
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#6 Old 12-30-2010, 01:03 PM
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Re: Rough idle problem

Quote:
Originally Posted by PCH View Post
Old plugs or dirty Idle Control Motor.
Where is the idle control motor located?
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#7 Old 12-30-2010, 01:38 PM
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Re: Rough idle problem

http://scionlife.org/Scion_Docs/2004...y/conponen.pdf

Great DIY on how to clean one: How To: Clean your throttle body - CarForum.net - Car Forums, Automotive News and Community
You can use wd40 if it's not too dirty.

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