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not much 200 1990

posted by  Rhys on  Sat Feb 24 15:57 CST 2007
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last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

At 24 mpg you are probably averaging about 35 mph, so to burn a gallon with the engine under load, doing useful work, takes about 45 minutes. At idle, hot, the engine might have used a quart and a bit. What the enrichment did in the first few minutes was burn a bit more.
The catalytic convertor doesn't like to be idled. It fails to reach its optimum temperature, and that coats it internally. To clean it requires full throttle - the Bosch system like many others goes intentionally rich at WOT for power, cooling, and to provide enough fuel to heat the convertor past the normal self-cleaning temperature. Doing that negates a low of fuel saving techniques.
As another poster said, use a block heater, and don't idle for more than a couple of minutes.





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