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2018 Abarth 124 Spider, Mare Blue / Nero Abarth Leather, Brembo's, Record Monza, Automatic
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Hi @Nycinter , the air conditioner puts a load on the engine, which in turn brings the idle down a bit and causes a bit of a shake - but this should be a momentary condition only, as the ECM recognizes the lower idle speed / AC on signal and should adjust the idle speed back up to 'normal'. When the compressor turns off, the opposite should happen. Sounds like this isn't happening though, so off to the dealer you go, for a free repair, before your warranty expires. Best, s
 

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I've never been impressed with this engine at idle. Always seems a little rough to me. Sure does smooth out as the RPM increases and that's what's important.
 

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2018 Fiat 124 Spider Abarth
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2,409 Posts
I notice the AC at idle, but don’t notice it otherwise.
 

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Totally normal.
 
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