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COLD IDLE ON AN EP3

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502
Hi, I have a 2002 EP3, cold idle is about 2500-2000 which is good, once warmed up is 850 rpm - so fine, but which sensor does the ECU use to know when the engine is warmed up and thus revert to the correct tick over ?

I'm sure someone will know?

cheer crowds
 
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I always thought it was water temp but I might be wrong.
 
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