I'm replacing the gaskets in a few days and will report back. 7K subscribers Subscribed Jun 28, 2023 · Learn about BMW fault code P0171 - bank 1 too lean. Bad wastegates or vacuum leak or other? When I start my car i hear a rattle noise but it disappears after my engine is hot I dont hear any rattling between 1500-2000 rpms (not sure how loud the bad wastegate rattle is if I can miss it) but when I get to 5000-6000 rpms I get Low Boost Pressure (30FF). 300F engine codes signify blown turbochargers or bad boost solenoids. N55 Valve Cover and Gasket Leak Symptoms: Low engine oil light Burning oil smells, or smoke coming from valve cover area Oil on spark plug threads The same exact valve cover leaks were also appearing on high mileage older N54 engines. May 21, 2018 · 335i Overheating Issues out of nowhere Thread Tools 335i Overheating Issues out of nowhere. I've done some logging with the COBB AP recently and I noticed that at idle, the engine barely makes 0. Don't just trust your MAF. For example, a smaller vacuum leak will make hissing sounds as the vacuum pressure escapes from the leaking hose. BMW N52 Valve Cover Gasket Leak Like the N54, the N52 engine is plagued by the same common valve cover leakage. What is BMW P0171 fault code? Jun 18, 2022 · In simple terms, a vacuum leak describes what happens when your BMW engine starts getting extra air from faulty gaskets, and cracked, damaged, or disconnected hoses. 0 or 0. If you have a serious vacuum leak in your BMW’s engine, you may hear a suction noise that sounds just like the hose on your household vacuum. On the way down to durban on Friday afternoon we hit roadworks, after idling for 2 minutes it started smoking heavily. And it can be a bad source of an air leak, as can the o-ring on the dipstick handle top, dipstick guide. Boost leak! Vacuum lines or turbos? Smoke and boost leaked showed no leaks whatsoever. You have to do a little investigating on where liquid oil is accumulating. It's a N54. Is this normal for the N54? or do I have a vacuum leak somewhere? Jul 10, 2025 · Here are the key symptoms to watch for: Your car might shake, vibrate, or struggle to maintain consistent RPM, especially when you’re stopped at a light. Usually they leak internally causing them to not pull the wastegates shut enough to b Jun 18, 2022 · In simple terms, a vacuum leak describes what happens when your BMW engine starts getting extra air from faulty gaskets, and cracked, damaged, or disconnected hoses. Oct 1, 2020 · I have had an N54 with this before and fixed it easy. I have been running intakes, downpipes and ecu tune for more than a month. Feb 14, 2022 · Vacuum leak Vacuum leak Sep 8, 2013 · Good evening Gents, I have some strange Issues with my 335. Apr 13, 2025 · Shop high-quality OEM and aftermarket parts for BMW, Audi, VW, Volvo, Saab, Mercedes-Benz & more. New comments cannot be posted and votes cannot be cast. It starts up "different" on cold starts, revs a bit higher than usual. Search "inlet manifold" @440istephen 335i High Pressure Fuel Pump early symptoms 😔 #BMW #335i #N55 #N54 #135i #E90 #E92 #E9X #E93 #e90335i #e92335i 395 Dislike If playback doesn't begin shortly, try restarting your device. Normally it sits at 0. two 10mm nuts, harness connector and two vacuum hoses. N54 Oil Leaks Problems with the N54 PCV will reveal themselves in different ways, depending on which system is breaking down (or both). It's an easy DIY replacement. A smoke machine is used to create smoke-like vapor that is used in the engine to visually identify where the leak is coming from. Why is your vacuum reservoir disconnected on the left side? That vacuum leak is likely causing your low boost. May 22, 2024 · What are the most common N54 engine problems? Read our guide and learn how to minimize the chances of costly engine failure on your 135i, 335i, or 535i! N54 Oil Leaks Problems with the N54 PCV will reveal themselves in different ways, depending on which system is breaking down (or both). new Boost solenoids, new vacuum lines. The oil leak can be caused by two things: either the valve cover gasket degrading or the valve cover itself cracking. Since the valve cover is made of plastic, it warps over time from the engine heat and can crack. I disconnected one of the lines from the vacuum canisters then quickly plugged the end with my thumb, heard a hiss and that was it. Jun 8, 2018 · Boost/Vacuum Leak? Video and Logs Inside. BMW N54 vs N55 Engine Since the BMW N54 and N55 share a similar design and have a lot in common overall, comparisons were bound to spring up. Dec 22, 2025 · Diagnosing and fixing leaks and faults in the BMW N54 engine is essential for maintaining its performance. Is it a boost leak or just a bad boost solenoid? BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / Specific Topics > 135i Turbo Engine (N54 / N55), Exhaust and Drivetrain Modifications Is it a boost leak or just a bad boost solenoid? Why is your vacuum reservoir disconnected on the left side? That vacuum leak is likely causing your low boost.

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