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we all know idling is bad for converter!!!???

posted by  Volvodad on  Tue Dec 3 15:09 CST 2002
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last visit: Thu Oct 23 16:18 CST 2014
[RELATED]

I think this advice is out of date. I recall hearing this in the early days of cat converters when most cars had carburetors and idle mixture was set somewhat rich to get a smooth idle. In any case fuel mixture was comparatively imprecise. Excessive idling could allow converter temp to climb to the point where the substrate could melt, ruining the converter. Also, at idle, there's no airflow to cool the converter. As others have said below, modern EFI systems maintain the proper air/fuel ratio for proper combustion and converter operation, even at idle.






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