Need expert help. Engine Noise. (Audio clip attached)

[heiwaz]

Hello, I hear a stranger noise in the engine of my 986 when accelerate, and when slow down, too. Here the direct link to the audio clip:

http://www.megaupload.com/?d=4AZRVVYY

I tought it was the tensioner belt, but I checked belt, tensioner, water pump, ... and all is ok. What do you think this noise come from. It seem like an electric engine.

[harryrcb]

Originally Posted by heiwaz

Hello, I hear a stranger noise in the engine of my 986 when accelerate, and when slow down, too. Here the direct link to the audio clip:

http://www6.online-convert.com/download-file/1f230baa90bb384b8fa354581ea43dcd/converted-14d5f37cb919cd.mp3

I tought it was the tensioner belt, but I checked belt, tensioner, water pump, ... and all is ok. What do you think this noise come from. It seem like an electric engine.

How did you check your tensioner and water pump? It sound like a brng noise and could be comming from anything that belt is attached to. I had a similar noise and turned out to be one of the idler pulley brngs. They are reallly hard to find unless you know what you are looking for. after removing the belt you turn each one by hand and you might feel just a slight difference from the other. You probably wont be able to hear it by hand turning unless you rig up your dremel with a rubber cylinder and spin each pulley as fast as you can.
hope this helped

[Jaxonalden]

The link says that you can only listen to it ten times then it's deleted. I'd love to hear it if there's some other link to use like YouTube.

[heiwaz]

Originally Posted by harryrcb

How did you check your tensioner and water pump?

Hello, I started the engine for a few seconds without the belt, the noise doesn't disappear.

[heiwaz]

Originally Posted by Jaxonalden

The link says that you can only listen to it ten times then it's deleted.

Hello this is the new link to download the mp3 file:


http://www.megaupload.com/?d=4AZRVVYY

[harryrcb]

Originally Posted by heiwaz

Hello, I started the engine for a few seconds without the belt, the noise doesn't disappear.

If it's not your front pulley's it could be a number of other things. Some may sound odd to you but I have experienced all these except one.
Have you noticed any change in power?
Have you replaced your air filter lately? if it's clogged really bad then it could be trying to suck in air throught the intake somewhere else(where it shouldn't)
If not it could be too much crankcase pressure blowing it out the vent tube
Could be the dreaded IMS bearing has gone bad
Keep looking

[heiwaz]

I haven't notices any power loss and the air filter is in good condition.
The IMS works perfectly, because I've changed it. I hear the noise before and after I changed the IMS bearing.
Where is located the air ventil?
Do you think it may be the chain tensioner?

[harryrcb]

Originally Posted by heiwaz

I haven't notices any power loss and the air filter is in good condition.
The IMS works perfectly, because I've changed it. I hear the noise before and after I changed the IMS bearing.
Where is located the air ventil?
Do you think it may be the chain tensioner?

the vents I'm referring to are the crankcase breathertubes, there is one on the drivers side upper front of engine (underneath all the intake manifolds) and it crosses over to the AOS the other one has the AOS sitting on top of it.then there is a short one going just behind the throttle body. It is indeed a strange noise but with out hearing it live it's almost impossible to trace. Have the car put on a lift while its running and see if you can get a location of the noise. Chain tensioners? I suppose it's possible there isn't much of a fix for that with the engine in the car. See ifl you can get a better location. Sorry I'm running out of ideas.

[heiwaz]

Anyone has the same noise?

I'll check the breathertubes, but if they're ok, probalbly I'll replace the chain tensioner, but they 3 are so expensive to replace if are ok.