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F30 / F31 / F32 / F33 (2012 - current)
The sixth generation 3 series, chassis code F30. 2013 model year 328i and 335i sedans now in production. Read the F30 frequently asked question thread for all your basic question and dive into all the details in the ultimate F30 information thread.

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  #1  
Old 06-07-2012, 08:44 AM
DavidinDC DavidinDC is offline
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Question Odd Engine Sound of new 328i

I got my new 2012 328i sedan about three weeks ago. This is my first Bimmer. So I am not familiar with the sound of the engine. After the second day, I noticed the engine made a strange tapping/rattling noise when idling. It's not a really loud noise, but you can hear it from inside the car. It alsmost sounds like a diesel engine. It concerns me to hear any noise coming from a new car when it's idling.

I've had the car back to the dealership twice. Both the sales person and a technician have listened to it. Both have told me it is the normal sound of the new engine model. I was told that if I picked any other car on the lot with that engine, it would make that same noise. I'd be fine with that answer, but I didin't hear it during my original test drive. I also didn't notice it in my car during the first two days.

Has anyone else experienced such a noise with their new 328i?
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  #2  
Old 06-07-2012, 09:35 AM
The BMW-est The BMW-est is offline
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Absolutely not. Lemon it right now because no other N20 engine sounds like that at all. You do have access to right?
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  #3  
Old 06-07-2012, 10:03 AM
DavidinDC DavidinDC is offline
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BMW-est, what do you mean when you say "lemon it"? Also, this is not the N20 engine. I believe it is the new F30. Have you driven one?
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  #4  
Old 06-07-2012, 10:13 AM
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rtgirard rtgirard is offline
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Quote:
Originally Posted by DavidinDC View Post
BMW-est, what do you mean when you say "lemon it"? Also, this is not the N20 engine. I believe it is the new F30. Have you driven one?
Hi David,

Please read the following thread. It will most likely answer many of your questions:
http://www.bimmerfest.com/forums/sho...d.php?t=602095

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  #5  
Old 06-07-2012, 10:14 AM
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cheikh82 cheikh82 is offline
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Originally Posted by DavidinDC View Post
BMW-est, what do you mean when you say "lemon it"? Also, this is not the N20 engine. I believe it is the new F30. Have you driven one?
F30 is the code bmw calls the car. The engine in your car is named N20. The noise is probably normal, it is an inline 4 engine, which kind make the noise you've described when idling.
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  #6  
Old 06-07-2012, 10:19 AM
sactoken sactoken is offline
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David, BMW-est was being sarcastic. You apparently didn't read through this forum to see if your question had already been answered. There have been probably hundreds of posts discussing the engine sound, this is easily the number 1 complaint about the 328. The sound is normal for the N20 engine.
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Last edited by sactoken; 06-07-2012 at 10:44 AM.
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  #7  
Old 06-07-2012, 11:10 AM
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justinnum1 justinnum1 is offline
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just crank up the stereo, did you get the HK?
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  #8  
Old 06-07-2012, 11:22 AM
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From the engine experts I've talked to the consensus is the noise is from the injectors. They're high pressure and tend to be noisy. There is actually a chunk of foam under the engine cover that helps cut down on the sound considerably. It is an unfortunate noise but one I think we'll see on a lot more cars (not just BMW) as everyone moves to the high pressure injection technology.

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  #9  
Old 06-07-2012, 12:49 PM
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Quote:
Originally Posted by sactoken View Post
David, BMW-est was being sarcastic. You apparently didn't read through this forum to see if your question had already been answered. There have been probably hundreds of posts discussing the engine sound, this is easily the number 1 complaint about the 328. The sound is normal for the N20 engine.
Nor did you read any reviews of the car before you bought it. Almost every car review out there, in magazines or on-line, mentions the diesel-like sound coming from under the hood. It's ok!
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  #10  
Old 06-07-2012, 01:13 PM
kc1953 kc1953 is offline
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Originally Posted by The BMW-est View Post
Absolutely not. Lemon it right now because no other N20 engine sounds like that at all. You do have access to right?
David,

Welcome to Bimmerfest. A few sharp elbows, for sure, but you have at your disposal a wealth of information from a very engaged and knowledgeable community. Just do your homework first, and you will be a welcomed participant.
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  #11  
Old 06-07-2012, 04:39 PM
Elk Elk is offline
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Originally Posted by tim330i View Post
From the engine experts I've talked to the consensus is the noise is from the injectors. They're high pressure and tend to be noisy.
Exactly. The fuel pressure rail in direct injection engines is often around 1,500 PSI. The noise comes from switching on and off this extremely high pressure by the injectors.

All direct injection engines make this noise to one degree or another. I don't know why the 335 is a bit quieter than the 328 in this regard.
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  #12  
Old 06-08-2012, 06:21 AM
The X Men The X Men is offline
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Originally Posted by Elk View Post
All direct injection engines make this noise to one degree or another. I don't know why the 335 is a bit quieter than the 328 in this regard.
Refinement, the I6 turbo engine have been around for much longer. I am sure BMW will work on the N20 in the up coming years to quite it down, as that seems to be the major complaints.
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  #13  
Old 06-08-2012, 06:25 AM
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White05X3 White05X3 is offline
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So OP - is your question answered and your concern addressed?
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  #14  
Old 06-08-2012, 10:09 AM
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JustinTJ JustinTJ is offline
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So OP - is your question answered and your concern addressed?
You expect a reply on this crap? Two posts and gone like the wind.
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  #15  
Old 06-09-2012, 08:48 AM
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OP, that's called DI and due to the injectors. Nothing can be done. Shame it's so damn loud
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  #16  
Old 06-12-2012, 07:27 AM
Spartan Eagle Spartan Eagle is offline
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4 Cylinder engines are nicknamed "four bangers" for a reason. Its completely normal. BMW I6 engines are more representative of BMW's sound
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  #17  
Old 06-12-2012, 08:55 AM
reidconti reidconti is offline
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Quote:
Originally Posted by Elk View Post
Exactly. The fuel pressure rail in direct injection engines is often around 1,500 PSI. The noise comes from switching on and off this extremely high pressure by the injectors.

All direct injection engines make this noise to one degree or another. I don't know why the 335 is a bit quieter than the 328 in this regard.
Yeah. First car I ever noticed it in was an 07 A4. I think it's just more noticeable on the 4-cyl because it fires less frequently for a given engine speed. On the 6, perhaps it sounds a bit more like a hum than clattering?

I did the Team USA drive in the 328, and with the A/C on low (hot day) I couldn't even tell the engine was running. Definitely doesn't bother me. I think the 4-banger's the way to go, it's a gem.
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Old 06-12-2012, 03:40 PM
Elk Elk is offline
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Originally Posted by reidconti View Post
I think it's just more noticeable on the 4-cyl because it fires less frequently for a given engine speed.
Very possible.

I doubt BMW is withholding technology or other means by which it could make the four quieter which it utilizes on the six.

It would be interesting to know if the injectors and the head design are the same on the two engines.
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  #19  
Old 06-12-2012, 07:55 PM
beren beren is offline
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BMW sound is a generational thing. My '76 2002 sounded quite different from my X5, and 328i too. For me the lacking feature in the 328i is exhaust note. It could have been a little bit more present in the sport line, but I guess that's why they market the performance exhaust.
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  #20  
Old 06-13-2012, 05:52 AM
OBS3SSION OBS3SSION is offline
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Originally Posted by beren View Post
BMW sound is a generational thing. My '76 2002 sounded quite different from my X5, and 328i too. For me the lacking feature in the 328i is exhaust note. It could have been a little bit more present in the sport line, but I guess that's why they market the performance exhaust.
Which makes you wonder if the engine and exhaust note of the 328 will change and sound "better" over the course of the F30 lifespan.
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  #21  
Old 06-13-2012, 07:32 AM
jtuds jtuds is offline
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Nice way to get welcomed to a forum eh? By a few dicks getting off on a dude who focuses on more in his life than a car brand....
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  #22  
Old 06-13-2012, 08:06 AM
dtc100 dtc100 is offline
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Originally Posted by reidconti View Post
I did the Team USA drive in the 328, and with the A/C on low (hot day) I couldn't even tell the engine was running. Definitely doesn't bother me. I think the 4-banger's the way to go, it's a gem.
Next time I test drive one, will remember to turn the AC on and see if the engine sounds better. I ususally leave AC on anyway, even in the winter, a good way to keep humidity down. Just turn the heater on at the same time.

Now the lack of exhaust note on the 328i is likely going to be a deal killer. I agree with the above post, at least if you care to order the M sport pack, slap a better exhaust on as a bonus.
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  #23  
Old 11-17-2013, 09:34 AM
tomsz tomsz is offline
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I have the same pinging issue with my 2012 328i

I have the same pinging issue with my 2012 328i, but does not matter what the temperature is. I had three loaner cars in the last month (not related to this), two 2013 328i and one 320i, and none of them made this noise. Otherwise it runs great and getting excellent mileage.

I wonder, if a valve (valves), lifter may be at fault. Either mechanical (bent or sticking valves /lifters), or accumulated a lot of grime and deposits. The sound from my engine is much more pronounced on the right front side (the left, if you are looking at it from the front).

The other issue may be the knock sensor(s). I a not that familiar with these ultra modern engines. I put 93 Tier 1 gas, fuel system cleaner and I can see a minor improvement, but far from being normal. The problem is that I purchased the car just a month ago with 26K miles already on it and do not know what it sounded like before. My 2007 X3 makes about the same sound when it's still cold, but only for about 10-15 minutes. After that it purrs smooth, puts my 2012 328i to shame.




Check this link: BMW 3 series (F30) 328i Year 2012 - Major Engine Problem

It sounds much much worse, but clearly his problem became much worse and was caused by a bent cylinder rod. I am not saying that the same thing is happening, or it will degenerate this bad, but the sound of his car at idle is very similar.

He says: "Update: After dismantling the entire engine and a 2week long investigation, they found a bent rod connecting the 3rd cylinder. However, STILL WAITING for BMW to provide a solution on whether they will repair or replace. This is CLEARLY a manufacturing defect. I'm getting very annoyed with their nonchalant attitude. This will be my last BMW. Never again."

The dealer should be able to check the engine parameters that include the knock sensor, valves/lifters, injectors, etc. What worries me (besides potential long term damage), is that I will run out of warranty and whatever causes this noise will strike a blow after I am off warranty already.

Last edited by tomsz; 11-17-2013 at 10:03 AM.
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  #24  
Old 11-17-2013, 09:58 AM
tomsz tomsz is offline
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Similar sound......normal?



Interestingly, the 2012 328i in this video sounds very similar (check at the 10:13 mark). I can see why my 6-cylinder 2007 X3 runs smoother due to 4 vs 6 cylinders, but why is it that the two 2013 328i loaners I drove both had a "smooth" sound?
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  #25  
Old 11-17-2013, 10:21 AM
HugH HugH is offline
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Originally Posted by Spartan Eagle View Post
4 Cylinder engines are nicknamed "four bangers" for a reason. Its completely normal. BMW I6 engines are more representative of BMW's sound
My 2007 Lexus GS 350 had a 6 cyl 300 hp engine and it made the same type of noise as my 4 cyl 2013 F30 makes. At that time there weren't too many direct injection engines and the Lexus dealers were swamped with complaints.

Last edited by HugH; 11-17-2013 at 10:29 AM.
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