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codes, CEL and lean(?) mixture 200

posted by  posaune on  Thu Oct 23 18:04 CST 2008
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last visit: Wed May 28 18:57 CST 2014
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Well, I know just about everyone has had a problem like this in the past and there isn't *one* good answer, but since I am supposed to leave on Saturday morning for an anniversary trip 6hrs away, I figure that I need some help quick!

Since I have my 945's interior completely apart waiting for a heater core, my wife's '92 240 decided that it would be a good time to throw codes 231 and 221. This started during an 85mi trip about 20mi after getting gas. As soon as I could, I stopped to check and clear the codes. When I restarted though, the CEL came back before the idle even settled. FWIW, I think this is a lean condition (221 is according to the 7/9 faq but not according to the Bentley) since there is NO smell of fuel and no smoke.

I have checked high and low for vac leaks with little luck, the AMM was known good about a month ago (from another 240 that I sent to the 'yard), and the O2 sensor is about a year/40k mi old.

The only other thing that I can think of that could be related is that this car seemed to set ECT codes about once/six weeks. Every time though, I would reset and the code would not come back. It doesn't come on now either - only 231 and 221.

Any gems of wisdom?






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