RPM dip with A/C running
 

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Anyone notice that when you have the A/C running and come to a stop the RPM would dip and then go back up? Dealer checked said was this was normal and all the new Subaru does it. Any thoughts?

It's not normal if it's severe and this is a documented issue with the twins. I've had the idle dip from about day 1. Bought mine in July '12. It usually goes away once the motor is warmed up, but it's embrassing to have someone in the passenger seat when the car is cold. They always ask if there's something wrong with the car. :thumbdown:

It seems to happen only when the A/C is running and I'm coming to a stop.

With the A/C on it's normal.

Not a fan of this car with AC on over 90 degree heat.. Too much of a drag to run the AC system.. Probably the main reason i'm going to add more low RPM focused mods to the car to battle this...

The A/C will toggle off if you floor it. Casual driving you shouldn't see or feel the A/C turn off.

If you turn on the A/C and the rear defroster at the same time it dips pretty hard, but then again you shouldn't be doing that. :P

Add an exhaust and most people won't notice a thing.

normal to me. most vehicles i driven, including family minivan had little RPM dip.

Same here, coasting to a stop sign/light in gear...when I get to around 8mph or less I put it in neutral and the dip happens.

Only with A/C on, the idle is totally stable without A/C. I do NOT think I am a candidate for the idle issue as that issue happens A/C on or off.

Sounds like everyone is saying this is normal when A/C is on, thanks.

What happens (in every car) is the A/C pulls a decent amount of electricity to run, so when the engine is turning at idle it is asking the alternator to pull harder to make more power to use the A/C. In older cars or cars with weaker electrical systems (my 90 240 for example) at idle if you roll the windows down the rpm's take a dive.

What other devices run off the alternator in this car? Even though I seem to have everything turned off on the dash/console I still feel like the alternator kicks in constantly. I'd like to turn everything completely off and see if it makes a difference to my idle.

I think the load on the engine itself to run the compressor is much more of the problem than the load on the electrical system.

It happens to me too and its not the idle dip issue mentioned above.
only occurs during rpm drop to idle and the AC compressor kicks in
and drops the rpms too low, then it quickly recovers after stumbling
and then is stable..
Only when the engine is not engaged to the trans when coming to a stop.
Not every time.. but happened a few times to me under those conditions..
IMO.. Its a software glitch..
otherwise i find the idle with compressor cycling to be very smooth and
transparent in operation.
mid 90's tomorrow forecasted.. Raven in the hot sun = :evil:

The electric power steering system is quite power consuming at times..