Jedan71 0 Report post Posted June 19, 2011 (edited) I have just developed a high pitch squeal from the engine area somewhere. Car details , 318i E36 1.8 m43 engine 223k on its. Auto the noise only appears when the car has warmed up. the noise is at idle but disappears when revv'd when driving as you rev, the sound goes but as you lift foot off pedal, once the car has started to slow, the noise comes back untill idle speed . i have replaced water pump i have removed all belts and ran it, te sound is there. The origin is some in bay area but hard to pin point. there is a black circle thing that sits on the middle of the manifild, cant see it in OEM, but it sits on the flange, 11611247772 part number. thats is hissing a lot. throw water on it, it gets blown away? does that mean anything. there seems to be performace drop but hoping there are seperate issues. I have checked under bay for anything obvious. had it checked over but nobody can tell what the problem is and costing me a bomb, so wanted it get fixing first time round. PLEASE HELP me.. losing my mind with the noise Edited June 20, 2011 by Jedan71 Quote Share this post Link to post Share on other sites
Jedan71 0 Report post Posted June 19, 2011 (edited) I have found the source of the moving squeal/ Noise. So posting my results for reference The noise is crankcase vacuum or sucking. This is caused by a faulty CVV/CCV/OSV/PCV all those different names listed on the internet. You can diagnose quickly by removing the dipstick when the noise is occuring or remove filler cap and you find the engine sucking air in. Once open the idle goes even worse. The difficult part of finding the problem is that everybody describes the fault different and the faulty part has so many names. Also never second hand as common fault on all models of BMW, Crankcase vent valve - CVV Crankcase vent valve - CCV Oil seperation valve - OSV Pressure control Valve - PCV Hope this helps other drivers of this fault Edited June 20, 2011 by Jedan71 Quote Share this post Link to post Share on other sites
boon 0 Report post Posted July 17, 2011 I have found the source of the moving squeal/ Noise. So posting my results for reference The noise is crankcase vacuum or sucking. This is caused by a faulty CVV/CCV/OSV/PCV all those different names listed on the internet. You can diagnose quickly by removing the dipstick when the noise is occuring or remove filler cap and you find the engine sucking air in. Once open the idle goes even worse. The difficult part of finding the problem is that everybody describes the fault different and the faulty part has so many names. Also never second hand as common fault on all models of BMW, Crankcase vent valve - CVV Crankcase vent valve - CCV Oil seperation valve - OSV Pressure control Valve - PCV Hope this helps other drivers of this fault Interesting Jedan I have a similar problem in my 1994 e36 318, i found one hose to be stuffed so brought an new one from bmw in hastings bloody expensive vac hose it was $97. then found another crack in hose under the idle cover so repaired that using some super glue and heat shrink.... for the time being. but the car idles like crap and has a squeal thats dam right embarising. i thought it might have been my at fluid so checked and topped up but noise hasnt gone away. My belts could probably do with a change. but this also sheds new light on an on going problem so will try that in the morning and see if it works. Thanks Boon Quote Share this post Link to post Share on other sites
cytamen 1 Report post Posted July 18, 2011 Fairly sure any car with a MAF will idle erratically if you take the oil cap off, regardless if there's an issue with it? Quote Share this post Link to post Share on other sites
Jedan71 0 Report post Posted August 2, 2011 How did you get on? Did it solve the mystery? Quote Share this post Link to post Share on other sites
