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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 03-25-2013, 06:15 PM   #1
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Join Date: Mar 2013
Location: Prague, Czech Republic
Posts: 35
My Ride: E46 323i
Strange sound from engine

video: http://www.youtube.com/watch?feature...&v=wMiYfDGXE7Q

Problem (chattering) begins approximately at 0:20.

RPM when problem occurs: 1500-2000.

First few times on video I push the gas pedal and the sound is OK. Around 0:20 I get to between 1500 (at that time I push the gas pedal) - 2000 (at that time I release the gas pedal) rpms and the chattering begins to be heard when releasing the gas pedal.

I will be very happy if you tell me what it could be.

I remember (about 2 years) it only when the engine is cold.

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Old 03-26-2013, 09:04 PM   #2
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Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
Hi! It sounds like there could be a loose part somewhere, like a piece plastic vibrating at that rpm. Have someone press the gas for you while
you check around the engine.

GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
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Old 03-26-2013, 09:10 PM   #3
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Location: nyny
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could be valve cover rattle..but video has to be of engine bay when reving...tons of plastic parts in there.

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Old 03-27-2013, 07:55 AM   #4
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Location: Prague, Czech Republic
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My Ride: E46 323i
Thank you for replies!

I will try to check it more carefully with someone pushing the gas pedal.

E46 323i
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