That's normal behavior for just about every car on the market.
What's happening is that when you first start the car, the computer sees that the coolant temperature and the O2 sensor temperatures are low. It sets a fairly high idle speed in order to heat up the O2 sensors, and bring the coolant temperature into the normal range as quickly as it possibly can.
As the O2 sensors warm up, and start to give the computer useable data, the computer starts to lower the idle speed as it controls the mixture in a closed loop cycle. The idle speed starts to come down. But, the computer still sees that the Coolant temperature is still lower than the normal range, so it still keeps the idle speed higher than normal.
Once the coolant temperature reaches the normal range, then the computer drops the idle rpm to where it belongs.
BC.
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Its not how fast you go, or how expensive your toys are.
Its all about how big your smile is at the end of the day that truly matters.
'98 Silver Boxster, '08 Ducati 848, '89 Honda Hawk GT, '89 Honda Pacific Coast
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