Re: Shuddering surging idle at lights when humid.....????? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Shuddering surging idle at lights when humid.....?????
Posted by Bill03aero [Email] (more from Bill03aero) on Wed, 23 Sep 2009 11:00:10
In Reply to: Shuddering surging idle at lights when humid.....?????, LUKE, Tue, 22 Sep 2009 17:33:37
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I have the same problem as well. It seems the 10% ethanol in our metro area(central VA) may be creating a carbon build up in the exhaust manifold and cat. It may be effecting the o2 sensor thus the stumble at idle. My car had a complete melt down on a really hot and humid day. After it cooled, it started ok. But it was from that point on that it began to stumble. Changing the fuel filter and using some fuel treatment helped a bit. If you have ethanol in your area, this may be the common thread. My car gets about 1.5 mpg less than non 10% fuel. Performance is also off a bit as well. If your rear o2 sensor goes than it may be the problem. Thanks.
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