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Old 06-24-2020, 03:55 AM   #5
humfrz
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Join Date: May 2013
Drives: 2013 FR-S, white, MT
Location: Puyallup, WA
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Quote:
Originally Posted by Schweiz View Post
Hey everyone, I'm new to owning a twin and new to the forums here.

Any insight is much appreciated.
Hello Schweiz and welcome to the forum -

Does your car have any power mods?

Are you sure the A/C compressor is not cycling, causing the idle to vary?

You might try putting your voltmeter on the battery when the car is running to see if their is any correlation between when the alternator is charging and the idle is fluctuating.

Did you get your last tank of gas where you normally do?

I doubt the ECU is still learning after the battery change, but, maybe it's a slow learner -

I hope you get it sorted out.

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