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Old 01-08-2012, 02:52 PM   #1
refill
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E46 Random chirping noise on cold starts

I have this random chirping noise that occurs during cold starts. It doesn't really have a pattern to it and I have already replaced the belts and idler pulley and tensioner pulley. It still makes the same noise as if before anything was replaced. You can heard a couple clear chirps around 0:16-0:17.


Last edited by refill; 01-08-2012 at 02:55 PM.
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Old 01-08-2012, 02:53 PM   #2
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sounds like your disa is rattling pretty bad.
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Old 01-08-2012, 02:57 PM   #3
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+1 OP, see that black box on the side of the intake manifold? Turn off the car, disconnect the plug to it and see if it goes away. If it does you need this part 11611440049


use my vid to change it

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Old 01-08-2012, 04:49 PM   #4
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Thanks for the replies. I will try this when I get the chance. Is there any risk of damage to the engine running without the DISA cable connected? I forgot to note this previously, but the sound goes away completely once the engine is warmed up. Does that help in confirming/eliminating a faulty DISA? I don't have any CEL light or codes being thrown either.
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Old 01-08-2012, 05:16 PM   #5
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No, nothing will happen. Just try doing what I said first. How is your oil level?
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Old 01-08-2012, 10:22 PM   #6
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No, nothing will happen. Just try doing what I said first. How is your oil level?
Oil level is fine.
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Old 01-09-2012, 10:31 PM   #7
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Started the car up this morning and it didn't exhibit the sound. If it is a faulty DISA, wouldn't disconnecting the cable not get rid of the sound? I saw other posts where a worn DISA valve will have a loose flap, therefore will continue to rattle without power connected to it. Since the noise does go away after warming up, isn't it unlikley it is the DISA? If it was faulty, shouldn't I be hearing the sound all the time and not just during cold starts?
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Old 03-05-2012, 07:17 AM   #8
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I have this same issue I think... OP, does the chirp increase with rpm? Mine goes away after warm, but I live in Florida so this rarely happens if the weather gets below 50.
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Old 03-05-2012, 09:09 AM   #9
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I have the same problem and not the disa valve!completely disappears after engine warm..help!
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Old 03-07-2012, 03:54 PM   #10
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I think it might just be idler or tensioner pulleys.
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Old 03-07-2012, 04:01 PM   #11
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OP, you might have multiple issues?

Even it your DISA is not making the noise, given the age of your car, it most likely needs a DISA anyway.

Easy enough to check and change.

See the first link below in my signature, there are pictures of the DISA out of the engine, some with the flap missing.
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Old 03-07-2012, 05:12 PM   #12
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I was thinking pulleys also...but use a hose to isolate the sound...first.

When the belt is off, check the other things that spin too...wp, alt, ps pump...while you're there anyway.

Check belts for cracks also...and doublecheck your oil...I never believe fanatics the first time they say something!

Also, what oil are you using if you don't mind a personal question! What's your oci?
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Old 03-08-2012, 07:46 AM   #13
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I don`t know for you guys but for me the noise is intermittent before I engage a gear and get`s like a real clak clak clak when I put it in D
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Old 03-08-2012, 09:54 AM   #14
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I don`t know for you guys but for me the noise is intermittent before I engage a gear and get`s like a real clak clak clak when I put it in D
Most of us in here have MT i believe sooo.. IDK what to tell you there.

DMAX what weight do you use? I'm fully SYN 5w-30 lol
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Old 01-26-2013, 11:37 PM   #15
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Did you ever figure this out? I've brought my pampered 2003 325xi (74k mi) to the BMW dealer 15 times over 8 years tying to figure this one out. Everything has been replaced on the front of the engine (ps, tensioners, all pulleys, alternator, belts). I hadn't heard of the DISA valve. Was that it? The chattering in my car is identical. Please respond if you figured it out. Thanks!
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Old 03-23-2013, 08:10 PM   #16
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I FINALLY determined the cause of this chirping/chattering. The dealer replaced the following parts (many under warranty, but some were not):
Hydraulic tensioner, tensioner pulley, alternator, power steering pump, alternator/idler pulley and water pump (it was leaking). The alternator, tensioners and pulleys were replaced twice. Do yourself a huge favor and start with replacing the belt first. Be sure to have them clean the crank shaft pulley of any residue. It's much more profitable for them to start with the hardware. But after checking my records, I realized that it was the belt that was replaced each time the chattering stopped for a year or two.
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