crankcase ventilation plate. On the cars i've heard it on its worse when coasting down as you describe and sometimes when the engine is cold at idle also. Indicates bad crankcase ventilation valve or plate.


Quote Originally Posted by MBXB
WTF!!??

I recently did all the rubber and gaskets on my 94 540i intake manifold. All my idle and codes problems are gone!

Today, Im running down the road and this saxophone sound comes from the engine WHEN I LET OFF THE GAS. (MAX VACUUM RIGHT?). When I get on the accelerator...no sax sound.

Car does the same thing when parked; sound comes from engine.

AC OFF; Heater OFF; No codes; Idle is smoothest ever since Ive had the car.