335e91 3 Report post Posted January 15, 2016 Just recently noticed there is "police siren" type of noise only when apply light acceleration between 1600rpm-2700rpm or when let off gas. No noise when parked or Rev up. No engine power reduced or error code. Just wondering what that could be:( . anyone had same issue? Quote Share this post Link to post Share on other sites
Michael. 2313 Report post Posted January 15, 2016 Could be the diff. Quote Share this post Link to post Share on other sites
OP6 27 Report post Posted January 15, 2016 The 323 or the 335? Quote Share this post Link to post Share on other sites
zero 1162 Report post Posted January 15, 2016 You are driving a cop car 2 Quote Share this post Link to post Share on other sites
335e91 3 Report post Posted January 15, 2016 The 323 or the 335? 335i bro, hopefully it is not the turbo going out:( Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted January 15, 2016 Turbo / compressor side air leak. Possibly a charge pipe or hose connection Quote Share this post Link to post Share on other sites
335e91 3 Report post Posted January 16, 2016 Turbo / compressor side air leak. Possibly a charge pipe or hose connectionthanks bro, will get it checked out on Monday Quote Share this post Link to post Share on other sites
Cab 148 Report post Posted January 16, 2016 You've probably got a turbo that's dosing - is it similar to this? http://www.youtube.com/watch?v=6qApXcIgrF8 1 Quote Share this post Link to post Share on other sites
335e91 3 Report post Posted January 16, 2016 You've probably got a turbo that's dosing - is it similar to this? http://www.youtube.com/watch?v=6qApXcIgrF8 Having trouble opening the link bro Quote Share this post Link to post Share on other sites
Olaf 3320 Report post Posted January 16, 2016 thanks bro, will get it checked out on Monday Hopefully you'll be using one of our generous sponsors, such a, well, Botany Motor Worx Ltd, or other companies listed here #8 ) Mind you don't unwittingly pull people over whilst you're cruising around. Quote Share this post Link to post Share on other sites
KidFresh 0 Report post Posted March 20, 2016 (edited) Ok I'm getting this noise too in my 135i. Anyone know what it is .... i always thought it was the turbo spooling up until i read this thread. Did some research over the net and its apparently shaft play caused by the bearings in the center section of the turbo wearing out over time which can cause turbine failure. I'm sick of this car; first walnut blast of the intake valves now this. ZzzzZzzzZZ Edited March 20, 2016 by KidFresh Quote Share this post Link to post Share on other sites