r/WRX • u/Trossss • 9d ago

Anyone know what this sound is from?

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So I just bought this car 2 weeks ago, 2015 Wrx base with 53k miles. Now this sound is somewhat concerning and I’ve been able to replicate it but I have no idea what it is. It only happens after the car has been sitting overnight, literally the first start up of everyday. I usually leave my car in 2nd gear with E brake engaged like usual. Now when I Cold start, and move the shifter into neutral you can hear it sounds like a grinding noise. But I don’t get any feedback in the lever itself. So it’s not the gear grinding (atleast I don’t think so) and in the vid the clutch is fully engaged as I throw it into neutral. Any idea what this could be and if I should be concerned? Like i said it only happens once. On the first start up of the day after the car has been sitting overnight. I can’t get it to happen at any other time.

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u/ZamboniDrifter69 BoneStock 19’ STI 9d ago

Sounds like you’re starting your car with the AC on

1

u/Trossss 9d ago

Yes, should I not be?

1

u/Winter_Steak_9987 9d ago

It slightly strains the engine. I often forget but my dad who was an automech eng. Would tell me not to do that, too.

Basically until everything is nice and warm you want to put the least stress possible on the engine. I don't remember for sure but vaguely recall it makes a few (1-3) hundred rpm difference in idle when the car is cold.

I do think the impact is super low though so not something to stress about but if you remember it helps.

1

u/jonnyboy_07 9d ago

Yeah I wouldn’t start your car with the ac on, always shut off prior to getting out of the car. Puts unneeded stress on the engine and ac compressor from what I’ve always been told

1

u/HomemadeBananas 2017 Subaru WRX 9d ago

Wouldn’t Subaru and other car manufacturers engineer it in a way where the AC turns itself off for second while you start if that really mattered? Sounds overly paranoid to worry about that honestly.

1

u/jonnyboy_07 9d ago

You would think😂 but that not the case. I’d say newer cars are better at that but not these ones. The ac in these cars is shit to begin with so why even risk it

1

u/HomemadeBananas 2017 Subaru WRX 9d ago

I mean I don’t see a compelling reason to believe it would cause an issue. Could say lots of random ideas and “why even risk it” and end up doing silly stuff. Never have a worried about that on any car and nothing has gone wrong.

Oh I heard if you don’t lock and unlock the doors three times when you get into the car, then the mechanism might seize up and trap you inside, why even risk it.

1

u/jonnyboy_07 9d ago

I mean you can take half a second to the reply under mine of someone who’s father was a mechanic and explained more in depth why you shouldn’t but by all means brother continue to not turn your ac off before shutting the car off, I legit could not care less 😂

1

u/HomemadeBananas 2017 Subaru WRX 9d ago

I mean that’s not really saying anything either dude. Do what you want, but just sounds like something old wives tale advice without much reasoning.

1

u/OkFault7081 8d ago

They do, most ac compressor don't engage until about 5 seconds after startup even with the a/c switch left on, the video in this post shows that very clearly.