2004 Volvo S40 engine whining + eng light on

Can you have the codes read off and post them on here?

sorry i cdnt reply earlier was on other projets ck code is 2187 system too lean at idle speed

The noise you hear could be related to the code and possibly your oil leak. The PCV box or oil trap box as some may call them, has a diaphram inside that teasr and creats an internal vacuum leak that starts to make a whistling sound. That box usually leaks engine oil as well. Quick way to test this is to remove the oil dipstick. Once you do you will hear a load suction noise and the whistling will stop. If you are in the United States especially in California, the oil trap is covered under an extended warranty of 10 years/150k miles. You would need to call Volvo to verify this by giving them your VIN#. You may also want to look in to upgrading the ECM software as well if one is available and is also covered by the same extended warranty. Good luck and hope this information helps you.

thank you for a valuable information that make sense before i got your msg i ckd the oil leak by removing all the front part of the timing belt including crank pulley cleaned the cam seals and crank seal let the engine run for close to 1hour at idle and no oil leak found exept around the covers where it look like tar and not oil drip and 1more thing i removed the oil filler cap half way and the noise stopped i guess same as dip stick removal im going to contact volvo dealer for what you suggested and see what the result is ill keep you posted about this subject thanks again franky

I am glad the information was helpfull. And yes, removing the oil cap would also give you the same results. If it is not covered under warranty then at least you know now it is the oil trap box that is making the noise. If you do the repair yourself, make sure you reset the fuel trim adaptations or the fuel trim code will return. usually unplugging the ecm will do that. Well keep me posted.

hi im glad to say your right on the money about that diagnosis of "oil trap" took it to volvo dealer and they confirmed the oil trap and they fixed under warranty coverage around couple of hours so thank you again good job you have my voting franky

I am glad it worked out for you and that they did cover under warranty. Thanks for the vote :)