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I have heard that when you start your car (cold) that is uses up to 6 times the amount of fuel that it uses in normal conditions until it warms up and goes into closed loop.
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That's a bit of a stretch. I'd say 1.5x is more like it on the coldest of days.
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If you do an EOC with a fully warmed up engine, and then start it with the clutch, does it still go through this routine?
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No, the ECU is aware of coolant temperature and the O2 sensor is already at operating temperature.
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and if so how long does it take to get back into closed loop roughly?
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Almost instantly.
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I ask because even when the car is warm and I do an EOC, whenever I pop the clutch to start, it seems to start just like I started it with the key and idles high for a while before it settles down. Maybe 30-45 seconds or so. Anyone have any info, links, ideas here. Any input would be appreciated, thanks.
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Solution 1: Put the engine back to work so it won't idle.
Solution 2: Take idle control away from the ECU by unplugging the IAC.