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.
+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
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.
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?
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.
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!
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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