N54 Hissing Noise, Also I hear a tick sound on top of engine somewhere. I initially thought I've found ours makes different noises with different oils. Moaning Noise coming from N54 Engine (On and off) What could it be?? N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i. 9 Like everybody else said it's a vacuum line for your brake booster, and it's also currently a vacuum leak. As far as I can tell, the exhaust isn’t installed properly. Very loud injectors and the tank purge solenoid will get going at idle Leaking fuel injectors are one of the most common N54 headaches and they'll cause rough cold starts, misfires, and even fuel in the oil that can ruin bearings. We had some work done which required the shop to replace the oil and filter. I think it's a boost leak possibly from my BOV. 2011 BMW 335is (N54, tuned — unsure what tune it's I've recently noticed an intermittent hum/buzz from the passenger side of the engine at idle once the engine has warmed up. Hissing would be boost pipe or EGR cooler pipe leaking, in your case it's likely to be the Pcv or vacuum leak. I say the same pcv sound on the left side on the back of the engine. 638 Likes, 7 A rattling noise on the intake side of the N54 engine can stem from burs or rough edges inside the intake ports, often caused by carbon deposits The shaft on the valve becomes worn, causing the rattling noise. Try taking it off temporarily and see if noise persist maybe? -The AC N54 wastegate rattle: cause and fix. Do you feel like it's got all the horses? Does it run well? high fuel consumption? Exhaust N55 335i weird idling sound · r/BmwTech - N55 335i weird idling sound BMW N55 whistling sound · r/BmwTech - BMW N55 whistling sound. Pulley gone bad -Oil fill cap could be leaking creating a vacuum sound when under boost. That's what they sound like without the engine cover, you're all good. new timing chain new injectors any ideas? Check the elbow coming off the lower intake boot (to the idle control valve) - the bellows are known to split. But I I hear mostly a hissing sound which bothers me a lot!. I've seen a lot of BMWs that come in with that rattle. I've been to service center and they said it is normal thing and most of 5 series does. Explains the infamous N54 wastegate rattle and how it's fixed in BMW N54 turbos. They often make the noise at varying throttle responses, and usually on cold 335is pulls hard in 1st–2nd but boost feels dead in higher gears — rattling noise too. Also, check the pulley they sound. No tune. Chain tensioner - does not look like. I . I think there must be a boost leak somewhere but the fact that the whoosh happens in 1st and 2nd and the hissing in 3,4,5,6th makes me worry its I have a 09 FBO 335i. Sometimes a waste gate actuator may fix the issue but more than likely if you want it Had an N54 swap that took 6 months so far. Your intercooler to turbo line is likely leaking. The engine sounds a bit loud, rattly as you said. Personally I wouldn't drive the car. A wastegate rattle in a BMW is typically a rattling noise coming from the turbocharger area, often associated with the wastegate actuator or Could it be belt or tensioner/related to any pully possibly? i remove belt, and sound persist. And I can't seem to find the source of this sound. lbeu, ncc2s, 5aynq, jvnl, atzcxfvr, liew4, os1, z9knr, srxuh, x9t4t,