Whining noise N20B20. There are many possible causes why your car makes that whining noise whenever you increase your speed. You need to have your brake pads (check both front and rear pads!) Update** Took it to a local German repair shop. However it is a constant pitch. The car (F32) rolled out in may '14, done about 65k miles, roughly 105000 km. Rather quickly I noticed the high pitched noise coming from the engine bay, following RPMs up and down. It may be that a small part has broken down and needs to be replaced, or perhaps your car … It is coming near the front end near the belts. Most times the symptoms are worse at low RPM or when the engine is cold and when cold also accompanied by a rattle noise at start. While the wastegates have been an issue on the N54 I don't recall people reporting the issue as a grunting or groaning sound. It is a loud high pitch squeal similar to a fan belt squeal. Hi everyone, When I drive past 10 minutes, my engine starts to squeal during idle. A failed PCV valve may produce a low moaning, whining, or whistling sound. I ended up putting the Default Wastegate up to 100 (apparently no worry about rattle on the N55) and left the JB4 disconnected from the MAF sensor. At a glance: Common causes of whining noise when accelerating. Typically the wastegate issue is a rattle, particularly at low speed or idle. Tech mentioned he drove it for some time and wasn't able to replicate the sound, but based on the video i showed him (will try to post later) and then two codes he got back from the computer (Mixture bank 1&2 and exhaust vanos) he thinks it's either the crancase vent valve or the valve cover is bad and needs to be replaced. Horsepower and torque loss noticeable during acceleration and a drop in fuel economy. N55 is 100% correct. All services carried out. Hello All, I'm writing here in hopes to get more help than on the E70 X5 Forum. When I tighten the oil cap , the squeal re-starts. Just in case the noise suddenly stops, that just means that the wear indicators are now worn out, and that you will soon be braking with metal-on-metal, rather then with brake pads on metal. I have owned it for just a couple of weeks. Yesterday, my wife and I were running errands, and when we got back into our 2011 328xi wagon, BEFORE I started the car, there was a fairly loud buzzing/static noise. This groaning noise sounds more like a brake or driveline issue of some sort but noises can be tough to locate and resolve. N55 Reliability Despite the many misconceptions that BMW’s as a whole are unreliable, the BMW N55 is actually a fairly reliable engine. The four most common problems with the N55 are, in no specific order, the valve cover and gasket, water pump, oil filter housing gasket, and VANOS solenoids. The whining noise crescendoed to the point where it was constant, the heat started blowing cold air even with the temperature all the way up, and then the critical engine temp light came on, putting the car in safety mode (only allows low revs and no quick acceleration). I have experienced a squealing/squeaking noise from a N55 135i before which wasn't belt/tensioner related, it was the front main seal and a rather common issue apparently. The source of the noise can be tested by blocking the vacuum source to the valve and listening for changes to the noise. When I remove the oil cap, the engine pressure is relieved and the squealing stops. Noise is one symptom to look for. After having my valve cover replaces as a warranty job because of a leak on the rear passenger side of the engine that was sending fumes into the cabin through the vents, a whirring/screeching noise started to be more loud when the car is at operating temperature. N55 with 80,000 miles. replaced a.s.ap. 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