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2015 Subaru Outback 3.6; 2015 A7
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51 Posts
Discussion Starter · #1 ·
Hello all

Our 2015 3.6R with 25K miles revs between 600-800rpm if we are stopped on a red light (i.e. in drive with brake pressed). Noticed that if I turn the AC off then it does not fluctuate the rpms.

The only thing I did last week was to replace the OEM battery with a Bosch battery (group 25).

Has anyone else seen this before?

Link to see video: https://we.tl/WFedtfx8mM

thanks.
 

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1999 30th Anniversary Legacy Outback DOHC 2.5L 4EAT, 2008 Impreza WRX 2.5L 5MT, 2008 Impreza Wagon 2.5L 4EAT
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1,224 Posts
The fluctuation may be as the AC compressor kicks on and off? Higher RPMs when the compressor is engaged, lower RPMs when it's not engaged?
 

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6,264 Posts
Hello all

Our 2015 3.6R with 25K miles revs between 600-800rpm if we are stopped on a red light (i.e. in drive with brake pressed). Noticed that if I turn the AC off then it does not fluctuate the rpms.

The only thing I did last week was to replace the OEM battery with a Bosch battery (group 25).

Has anyone else seen this before?

Link to see video: https://we.tl/WFedtfx8mM

thanks.
I think if you do some searching there is already a thread on this with a zillion posts.

My '15 2.5 does it. I haven't never given it a second thought.
 

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2013 Outback 2.5i Convenience
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1,388 Posts
Perfectly normal. AC puts a load on the electrical system and the ECU adjusts for it by increasing the rpm momentarily. Same with the radiator fans when they click on and off.
 

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I've noticed an irregular idle after battery changes; seems like when there's zero power the engine has to learn the optimal idle again?
 
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