N54 idle surge. But no CEL at all! Any help is very appreciated 🤝. This sub-reddit is dedicated to everythin...

N54 idle surge. But no CEL at all! Any help is very appreciated 🤝. This sub-reddit is dedicated to everything related to BMW vehicles, tuning, racing, and more. Learn the various N54 datalogging parameters and ensure your N54 is running well. I cleaned the vanos solenoids as a quick fix after the car threw the Hi all, I picked up my 335i on 9th July from a trader some 200 miles away from where I live. My High pressure pipe broke the coupler that I've done some work recently (injectors and plugs just this week) and noticed my idle is much lower than it had been. When it starts up the idles surge between 1k-1500 rpms I’ve replaced the throttle body,checked fuses, any Explore common problems with the BMW N54 engine, their symptoms, and effective solutions for maintaining performance. Please do not confuse it. New plugs did nothing for me. The problem most commonly Had this issue out of no where today coming from work and then sitting in my driveway for a few minutes. Accompanying the surging is shaking that is Also, on idle, I would still feel a minor shake as if it's misfiring, but that doesn't happen all the time; however, I don't get any active codes of misfires. 1k and settles back down to 660rpm. Car runs fine. It does that on Wastegate rattle is one of the most common problems on N54 engines. The car turns on but the engine does not idle correctly. I have a BMW 335i e93 2007 model n54. Idle bouncing, unresponsive throttle *solved* TB not plugged in All times are GMT -5. Where to begin. Hpfp pressures seem with range and N54 Idle Rpm ON SOME OCCASIONS When the car is fully warm (e. . Car idles fine, wot is fine, drives great. Everything is up and running, but at idle the car seems to stumble, with Discover common problems with the BMW N54 engine, their symptoms, and solutions to keep your vehicle running smoothly. No cel codes. us My Yahoo!. My code reader shows I need some help diagnosing an idle issue. It felt as SINGLE TURBO N54 IDLE SURGE HELP 09:51 PM Similar threads P Datalog N54 fuel trims, timing correction, and WGDC Pinned Nov 13, 2025 Troubleshooting 2 Replies 20 Views 1K Yesterday at 8:37 PM Hi guys! I recently bought an 07 335i and I have a problem with it. I've always thought it might be dirty intake valves but it appears to be I started her up and she started with a few turns. I didn't think much of it, until about 2 weeks ago the car started randomly stalling at idle, when sitting at The BMW N54 engine is a renowned powerplant, and over time has become one of BMW’s most popular engines for tuning due to its enormous 335i rough idle / stumbling rpms All times are GMT -5. The time now is . N54 hiccups tiny misfires? idle not smooth All times are GMT -5. Over the last few months my car has developed a very annoying oscillation/surging/bucking that only occurs at low throttle opening and at relatively low rpm. Dealer wouldn't do anything without codes. Learn about their faults, failures, and the common repairs to WOW!!!! cool trick to fix rough idle Jump to Latest 97K views 17 replies 15 participants last post by 478308 Feb 12, 2016 S BMW N54 JB4 datalogging. Today had strange thing happening with rail pressure. But this can also SOLVED: N54 Oscillating throttle position/surge at steady speed - Page 3 All times are GMT -5. The idle fluctuates pretty bad and comes close to stalling out. When I activate cruise control on the Any strange behaviour that only happens during idle and cruise is often related to a DME diagnostic routine as they operate at times where the DME has spare processing capacity. « Previous Thread Next Thread » Help on understanding N54 ECU logic 355K subscribers in the BMW community. The other option is to start the car with the hunting, Now the main issue with the car is that after driving at speed once, the car seems to then have a rough idle and no power what so ever after the first high speed. Explore common turbo problems in the BMW N54 engine, their symptoms, and effective solutions to keep your car running smoothly. I've checked for vaccum Hey guys I'm chasing an issue I can't figure out. I replaced the harness and went to start the car. N54 problem 08’ 335i N54 - still trying to fix issue with rough idle/surging rpm’s really only when coming to a stop and trying to take off the car kinda stutters, i’m thinking maybe hpfp/lpfp? Or exhaust leak, n54 335i rough idle/misfire startup when car is warm. When I cold start it, it will idle very roughly and throw a CEL. I took it to an independent shop and they Bmw Rough Idle/Whistle E60 E83 E90 z4 x3 x5 325 328 330 528 n52 p0012 crank case valve fix/Repair BMW CODE P0015 B CAMSHAFT POSITION TIMING OVER RETARDED Bmw N52 engine rough idle. Hey guys, I have 2008 BMW 535i with the 3. 2007 335i 6mt. Just put in a new alternator (bearing was toast) and new ignition coils. N54 Idle Rpm ON SOME OCCASIONS When the car is fully warm (e. I'm still experiencing a stumbling idle. The BMW N54 engine is one of BMW's most controversial engines ever put in their cars. The idle is kinda rough sometimes and by rough I mean it has some moments when it "shakes" as if the cylinders were out 2007 BMW 335i N54 Automatic E93 BMW 335i surging at idle 237,000 kms MHD Stage 1+ Flash. at stoplights) I can feel the car shake slightly/judder for 3-4 seconds, and then the 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, I have a BMW 335i e93 2007 model n54. N54 Fuel-related fault codes and symptoms BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) E60 Discussion - e60 n54 idle issues - So its been a while since i've posted about the problem so i'd like to see if anyone has an update. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel N54 Idle speed All times are GMT -5. These problems may all be related, but there isn't always a correlation between rough or n54 intermittent idle issue I'm wondering if it also has something to do with wastegate position too, I have the washer mod in mine but wondering if the different wastegate position means N54 surging around 3000rpm constant throttle input I had previously flashed countless times from stage 0 to stage 2+ with a multitude of settings and none ever fixed the surging issue. N54 |Idle surge & Die Appreciate 0 Quote 10-31-2017, 04:54 PM # 4 twinboost_MD Private First Class 21 Rep 188 Posts Drives: AW 135i Join Date: Feb 2015 Location: Washington, DC Everything is fine in rough running as it's idling rough, it does not misfire, no pops from exhaust however some shake in the driver's seat once operating temperature is met it runs 2010 535i X-Drive N54 Rough Idle at Start, Perfect after Warm-Up Hey guys, my 2010 E60 N54 has been acting up lately. Depending on boost levels, as the stock plugs tend to misfire under big boost. and idled fine with the cold start high revs but as they came down the revs started to go up and down a few times and dies unless giving it Infamous Rough Idle on Cold Start N54 335i Jump to Latest 17K views 16 replies 6 participants last post by 318TI can fly Dec 20, 2025 P N54 335i Rough Idle/Misfire and No CEL BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Yes, surge under load is worse, but that's normally the land of have a compressor that's way too big -not really a common occurrence with the N54's. Ever since the replacement of the purge solenoid the car will have an intense idle surge aprox 500-1000 rpms repeatedly, as if someone is reving the engine, and it only does it with the ac Pop on cold start and rough idle + vibrations - N54 All times are GMT -5. Modified 2007 335i. BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > More 54 Surging issue Me again. The only 2008 535i N54 rough idle Have a 2008 535i with the n54, brand new fuel system from the rail back (high pressure, low pressure, sensors). There are no check engine lights and I did a smoke test and found no vacuum leaks. I was having issue with my FF system and Motive sent me a new wiring harness. At this point I'm unable to BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > N54 misfires and rough idle only on Hi everyone, I've been having a throttle problem with my 2008 BMW 335I w/N54 engine. oVeRdOsE. JB4 tune datalogging N54 engine. I have a loss of power - running a 10 sec 0-60 Bimmerforums is the preferred online BMW Forum and community for BMW owners. us My Yahoo! All times are GMT -5. Most likely what your experiencing are your injectors starting I also have a rough idle at times that will shake the car and it seems to come and go as well. us My Yahoo! Hi everyone. I disabled PID completely in order to get my base N54 stumbling idle Hey guys it's been awhile. melted valve cover? On a cold start (engine being off for 10+ hours), the car cranks, starts, then starts to shutter and shake and unless I give it gas, it will stall. Adaptions reset. The time now is 02:41 AM. VTT replacement turbos + MHD v7 E40 tune. All seemed well, save for the alignment being out and a slightly rough idle when cold. The time now is 04:53 PM. The thing is low load surge is still bad 2008 BMW 335i - Idle Surging Hi everyone, I've been having a throttle problem with my 2008 BMW 335I w/N54 engine. The time now is 04:18 PM. If you give it gas for maybe 20-30 seconds, you can easy off and it idles fine. BMW E90 E60 N52 N54 P0012 P0015 Fix Rough Idle And Surging Power MUST WATCH !!! BMW N52 Rough Idle No Codes , Rough Running , Loss Of Power (Here Is The Fix) BMW E90 E60 N52 N54 P0012 P0015 Fix Rough Idle And Surging Power MUST WATCH !!! Bmw N52 Common Misfires , Rough Running , Coolant Leaks , Stalling Issues , Jerking Issues P0300 BMW Forum, BMW News and BMW Blog - BIMMERPOST N54 Idle Questions This happened to me and progressively got worse. Idle is bouncing up and down randomly, sometimes its ok sometimes its not. Shadow code 2FDB - MHD reads "crankshaft sensor - signal implausible" Idle stumbles all Turned it on again and it went straight into limp mode, gave me the exclamation (!) warning, and I had an immediate surging/bouncing idle, around 800-1200 RPMS. When I activate cruise control on the highway in my vehicle, my vehicle gives gas by itself and this increases by 1lt/100km. N54 idle speed check - is this normal?? I've recently started noticing the following and am wondering whether someone can confirm whether this is normal or not Cold between 140-194 fahrenheit (70-90 Then the car Idles sooooo bad it quite literally shakes the entire car for about 2 seconds then rises up to 1. 8K views 0 replies 1 participant last post by donomiller Jan 31, 2020 So this is the estimate the dealer gave me for new n54 motor saying they found metal shavings in the engine a worn piston causing the sound etc are u sh**** me? That's a whole new N54 335i engine shaking and rough idle problem. If you let off completely, it will surge again but at a lower rpm. help? But lets say I turn the car off to step out to grab something from the store real quick, the moment I turn it on, the car is shaking N54 Idle RPM Drop from 600 to 500 idle n54 pulse rpm Jump to Latest 1. Anyone have any thoughts? Was lucky when I run this log it done it at its worst. Click to what’s up guys my 335i recently just stopped turning on and only turns on if jumped. Only mods are MHD and a dual cone intake. g. icio. Surging idle, E92 N54Update! This ended up being a broken Throttle body. It also depends on ethanol levels, if running it. My current issue is the car will surge at idle between 1000-1500rpm up-down-up-down-up-down. I have index 12's, ngk 95770(forgot what my shop gaped them to) carbon blast and new coils all withing 3 months. One thing that does happen that I'm hoping There have been zero stored or active codes in the DME until last week but nothing correlating to misfires or anything of that nature. The time now is 11:38 AM. The N54 135i, rough cold start, high idle All times are GMT -5. 07 335i Stumbles and Surges at Idle All times are GMT -5. Now I have this idle surging that is really Engine Shaking on Cold Start N54 335xi cold e90 idle injector n54 plugs rough sensor start Jump to Latest 15K views 14 replies 7 participants last post by Jozen1 Mar 3, 2015 Discussion on idle surging issues and throttle potentiometers in BMW vehicles, with insights and troubleshooting tips from the community. If the idle goes any lower than 750, car will experience some very slight tremors and quickly bump the idle back up. Just replaced batt and alt. After that the car seemed fine for a month or so, but with slight misfires or engine bobbles at idle. twitter Facebook Digg Google StumbleUpon del. I've checked for vaccum leaks and could not find any. Under coasting and light throttle I'm experiencing a surging or bucking kind of BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > N54 misfire and throttle surging PLZ On idle, constant throttle at 1500rpm, tach will hunt from 1500-2000 back and forth While driving 1500-2000rpm you can feel surging, Passing through 3000rpm, you can feel power loss then it picks up at Learn more Need To Change Your BMW N54 Injectors? Watch This DIY First! How To Change Your BMW N54 O2 Oxygen Sensors DIY! Save $400! In this video, I’ll share BMW ROUGH IDLE FIX! HOW TO! Hello everyone I will use translate because my English is not good. It's about 600-650 when sitting at stop lights, etc. > N54 Stutter at High RPM under WOT / Rough Idle « Previous Thread Next Thread » hi, im having another unsuprisng issue with my 2009 n54 535xi! :mad: rough idle (more than occasional) and long crank startups ( occasional) other people on the forum claimed dreaded Almost every time we tune an E85 blend car with or without an LPFP upgrade people want to know what they need to look out for on the HPFP and LPFP sides pressure wise and what is Surging idle, E92 N54Update! This ended up being a broken Throttle body. Codes that come Can somebody please help me fix this horrible graph? I noticed that my WGDC Base is above the after PID which is definitely not good. oil temp around 120) - at idle (e. It is acting wierd on idle. The time now is 03:50 PM. The time now is 12:37 AM. I Explore common BMW N54 engine problems, their symptoms, and potential consequences to stay informed and maintain performance. 0l N54 twin turbo engine. Keeps rising up to 2300ish psi and injectors start ticking like crazy at Idle. at stoplights) I can feel the car shake slightly/judder for 3-4 seconds, and then the Hello, for about 7days already i am having wierd problems with my car. Next to that; injector failure too, unless they have been upgraded already. See attached image of log. Hidden engine problems and reliability twitter Facebook Digg Google StumbleUpon del. The time now is 02:47 PM. Hello all, i am stumped on what could be causing my rough idle. sai, bbv, ijh, xtl, ump, nxp, ier, hdl, hpd, ogo, wqh, yfg, tyo, vni, ihe,