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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Engine trembles at idle
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      09-24-2020, 11:28 AM   #1
doublevanosrc
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Engine trembles at idle

Greetings,

I'm currently looking at a 2017 330i sport at a dealership, the car rides like new however I popped the hood while the engine was running and noticed that the engine trembles like a 1990s Honda Civic, the exhaust tips also tremble during idle. I asked the dealership and they said its all normal, I've had 330s for loaners before and didn't notice this, thoughts?

Thx

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      10-02-2020, 11:43 PM   #2
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Does it look to run smooth and kinda hiccup? If cold, could be idle enrichment...or it could be a slight miss. Depending on mileage, spark plugs are a cheap and easy thing to replace, relative to virtually anything else maintenance and performance related. Might be a case and do a visual check of the air and boost locations. Unmetered air at idle (vacuum) can give rough idles. Quick way to tell is to unplug the MAF sensor, fail-over to speed density, which isn't as touchy with leaks.
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