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Old 04-11-2015, 10:58 AM
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Quote:
Originally Posted by PhastPhil View Post
I'll post this here first then a new Thread if it's not appropriate:

In the coding, there is a code for:
IHKA: Automatic compressor engine speed.
The explanation is: Increase engine speed when A/C compressor is ON.

I have lived with higher than normal idle speed (900rpm) when the compressor is on, and had asked the dealer if there was someway to reduce it...they said (as usual) NO. The higher engine idle speed makes the X5 a bit unruly at slow speeds and braking.

So I see an option now in the BMWHAT APP to decrease it.

MY QUESTION: BMW must have had a reason for running the idle speed up with A/C on...I thought maybe emissions? A/C cooling? but, what negative effect would be to reduce the idle speed to normal (about 600rpm) as when there is NO compressor running ?
On most cars the idle speed is increased when AC is on to compensate for the extra load the AC compressor places on the engine. On older cars you would see this as a drop in idle speed as you switched the AC on. Mine has been set to off since I got the vehicle new.
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