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Marty
Marty, ASE Certified Technician
Category: BMW
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Experience:  ASE & Bosch Certified Master Tech. Over 30 years experience.
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323i: I have a 1998 bmw 323i manualmy car make a squeaking

Customer Question

I have a 1998 bmw 323i manualmy car make a squeaking noise like a duck. when I drive fast it stops,but when I drive slow or slow down it makes the noise,also when I remove the oil dipstick I hear the noise louder
also. please email me XXX@XXXXXX.XXX
thanks
Submitted: 1 year ago.
Category: BMW
Expert:  Marty replied 1 year ago.

eurotec :

Hi, and welcome. My name isXXXXX noise you are hearing is most likely coming from the crankcase vent valve. When the valve fails it can cause a squeak or honking noise to come from the crankcase. If you remove the oil cap and the noise goes away it is most certainly a bad vent valve.

eurotec :

Another possibility would be a bad bearing in one of the belt pulleys but removing the dipstick would have no affect on a noise from the bearings. This sounds more like a bad vent valve.

Customer:

when the car is idle I don't hear it

Customer:

if I start it in the morning and its idle then I hear it for a few seconds then stop

eurotec :

Is the check engine light on?

Customer:

no the engine light is off

Customer:

I have no errors on the dashboard

eurotec :

Do you only hear the noise first thing in the morning?

Customer:

no

eurotec :

Are you sure removing the dipstick affects the noise?

Customer:

I hear it off and on...example if im taking off slow

Customer:

yes I tested it this morning..i starting the car then I took out the dipstick and it got louder

Customer:

started*

eurotec :

Ok, if that is the case it would have to be a fault with the vent valve for the crankcase ventilation.

Customer:

its more like a honking soft sound

Customer:

how can I fix that?

eurotec :

It's a very common problem on the BMW and it can cause strange noises in the crankcase when it fails. A honking type of noise is definitely one of the symptoms.

Customer:

ok

Customer:

r u there still?

eurotec :

Well first there is a test that we perform with a manometer to be sure the valve is bad. The valve is located underneath the intake manifold and is very difficult to access. The normal charge for replacing the valve and the vent hoses that connect to the valve is about 2.5 hours.

Customer:

oko

Customer:

okay

eurotec :

Full Size Image

eurotec :

Click on the image above. Item #2 is the valve.

Customer:

I see

eurotec :

#4 is where the hose from the valve connects to the dipstick tube. That's why it gets louder when you remove the dipstick.

eurotec :

#1 is the vent hose that runs from the valve cover to the valve.

eurotec :

The valve retails for $87.

Customer:

is there any other way I can fix temporary

eurotec :

Not really. If the valve is bad it will need replacing. The hoses that connect to the valve should be inspected as well. If a hose split it could cause the noise but it's usually the valve. You would need to inspect the hoses from underneath the car.

Customer:

ok..

Customer:

I live in the caribean

Customer:

they aren't really good bmw mechanic

eurotec :

I can imagine.

eurotec :

Click here for a good article on the replacement if you want to attempt this yourself.

eurotec :

Or you could print the article and give it to your mechanic.

Customer:

thanks

Customer:

I have a question

eurotec :

ok

Customer:

how many questions can I ask u

Customer:

the more questions I ask the more I have to pay? how does it works

eurotec :

If it pertains to the same problem you can ask all you want. If it is on a different problem you are supposed to open a new question. They don't like us answering multiple questions on different problems under the same question.

eurotec :

Just go ahead and post the question here and I'll see what I can do.

Customer:

ok I understand

Customer:

my ac works fine while I'm driving but when I stop it doesn't cold

eurotec :

Have you had the a/c system evacuated and recharged for this problem? Low refrigerant is the most common cause of poor cooling.

eurotec :

I would also make sure that the fan in front of the a/c condenser is working at idle.

Customer:

ok I will check that out

eurotec :

Ok

Customer:

thanks

eurotec :

You're welcome. If you would please take a moment to rate my service today I would appreciate it.

Marty, ASE Certified Technician
Category: BMW
Satisfied Customers: 50114
Experience: ASE & Bosch Certified Master Tech. Over 30 years experience.
Marty and other BMW Specialists are ready to help you
Customer: replied 1 year ago.

good day


I just replace the vent valve and hose


And it still makes that honking noise


The mechanic change the crank case valve with a spare one that he had and still made the noise and the hoses are in good condition..


what else can be the problem. PLease let me know ASAP

Customer: replied 1 year ago.

 


good day


I just replace the vent valve and hose


And it still makes that honking noise


The mechanic change the crank case valve with a spare one that he had and still made the noise and the hoses are in good condition..


what else can be the problem. PLease let me know ASAP

Expert:  Marty replied 1 year ago.
Hi Uveen, without hearing the noise myself this can be very difficult to diagnose. I can only tell you what is common on this car and the crankcase vent valve will commonly cause this type of noise. If the vent valve he installed is definitely a good one and if he replaced all of the hoses to the vent valve I suggest that you try removing the belts and see if the noise is still there with the belts removed. If the noise is still there I would have to think that the noise is coming from inside the intake manifold.
Customer: replied 1 year ago.

he told me the noise indeed was coming from the intake manifold

Expert:  Marty replied 1 year ago.
Ok, then I would suggest he removes and inspects the DISA valve on the manifold. The valve can cause noises from the manifold area. Click here for a picture of the valve.

Customer: replied 1 year ago.

ok thanks

Expert:  Marty replied 1 year ago.
You're quite welcome.

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