N54 stumble on cold start. Location: Toronto. It depends on where the noise is coming from exactly. Retrofits: CIC, Wireless CarPlay, Ventilated seats, Active backrest width adjustment, Auto rear liftgate, ZHP shift knob. It also fixed low end power issues in first gear which I didn't know existed until after the fix and I realized a difference. I've been having this issue where my 2011 bmw 335 e90 (n55) idles kinda roughs during cold start. You will need to get a scanner and get us some more information. Gear WOT d) MHD Stage 2+ Index 9 and mix of injectors 4. I can make it do the same thing going from higher RPM to low RPM suddenly when cold seems to trigger it as well (this to me suggests VANOS). When starting the car at around -10 Celsius (14F) it catches instantly, no stumble but then the RPM drops after about 10 seconds to around 700~ and it runs really rough. It only does it when the engine is cold. Oct 11, 2017 · I will post up a video after work today. If I touch the throttle it will not start and seems to flood (fuel smell). This only happens when I start the car with the engine already warm, no symptoms on cold start. Hey guys, my 2010 E60 N54 has been acting up lately. Additionally, it took home 3 straight Ward’s 10 Best Engines Originally Posted by Jeffman. BMW N20 Engine. the harder the lateral forces, the more it misfires. The cold start noise reduction turns off warming your cats for emissions purposes, which takes under a minute, turning it off or leaving it on will zero effect on oil changes/pressure. 5 seconds but recovers quickly. Should I get the entire tip assembly replaced at the BMW dealer Sep 26, 2017 · This only lasts for maybe 1-2 seconds at most and then the RPMs return to normal and the car is fine. A forged crank and rods deliver solid strength. Will go back to normal having restarted car a few times. Just picked up my first - a 2007 335i 6 spd. Hello all. other words rpm bouncing. Fuel pump had it replaced 2 times 1 buy independent and the second buy dealer. iTrader: ( 1) FIXED: N52 help, car starts up but almost dies first few seconds, then drives perfect. Another area to look at would be the throttle body and also the intake. If I leave the vehicle long enough for the engine to cool down partially, it will re-occur. No codes are being thrown Stats on car: jb4 latest firmware n54 MT DCI axleback exhaust BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Misfire/stumble at cold start Google Search Feb 27, 2015 · Engine Shaking on Cold Start N54. To check for a vacuum leak do this check. Hello BMW world, I have a 2008 335xi 93K miles and I have recently moved from Texas to Philadelphia and needless to say my car is definitely reacting to the climate change. Values of less than 900psi as full throttle indicate a fuel delivery problem and the JB4 will failsafe at 700psi at full throttle. No problem. It was BMW’s first mass-production turbocharged, gasoline engine. Index 12s and about 3k miles on them. It can be not bad some mornings and then on other it shakes the car. I will post up a vid of a semi warm start after work today and tomorrow morning a vid of a cold start. Once you park your car, your injectors leak (which they aren’t supposed to) onto your spark plugs causing it to misfire, it isn’t strong enough to cause a code because it’ll kinda clear itself, but the injector (s) will get worse and leak more and more till you replace them. 2. Listen from 0:21 to 0:25. Below is what I've tried: I replaced injectors with all index 12 and 11. When i start the car in the morning, the RPMs go a While I think this is rod knock, it is entirely possible that your AC compressor is running completely dry. Nov 8, 2012 · Recently my car has started to idle roughly and stutter for the first 1-5 minutes depending on how cold it is and how cold it is outside. I live in Edmonton, weather got to -40 Celsius, and that's when it decided to give up. Quote. I had scanned it with ISTA D, found no code. New plugs, new coils, new index 12 injectors all in the last month. Now that the cold weather has moved in, the car has a really bad cold start and misfires like crazy. Happens only when the car has been sitting overnight. There are no SES lights or any other symptoms. When the AC compressor runs dry, it sounds a lot like rod knock. It is longer at colder temperature (outside Nov 23, 2018 · The computer likes to “custom tune” when the engine is cold I’ve noticed. Just put in a new alternator (bearing was toast) and new ignition coils. Car still randomly shakes or jerks, or kind of stumbles at a redlight. Torque (lb-ft) 300-332 lb-ft. Once it warms up, I can switch off the engine and turn it back on and it's smooth and there are absolutely no issues (at idle, driving or WOT). There could be a vacuum leak on the intake. Join Date: May 2012. Just buy a simple switch and route the button into the cabin to pull the plug on vanos. It seems to accelerate just fine. The rough idle only happens on very first start up of the day. But the desired rail pressure isn’t what it should be at cold start thus May 4, 2020 · Nothing other than basic bolt ons. I have spark and fuel. Think of the N20 as the N54's cousin from the city. An aluminum open-deck block and aluminum head help keep weight down. This cycles on and off for about a few minutes. Hey guys, Looking for some feedback on an occasional startup issue with my '14 335i with 35k miles. Sometimes it starts up totally fine. BMW’s N54 engine was an instant success, earning 5 consecutive International Engine of the Year awards. Feb 10, 2023 · After installing this kit, I was still getting misfires. Typical values at full throttle are 10-14, or 1500 to 2100psi. once I straighten out the car, it runs Jul 28, 2021 · Since we are dealing with a BMW rough idle on startup, we will start our test at the intake muffler (air filter housing) and work our way downstream towards the cylinder head. Sep 12, 2021 · Join Date: Jun 2016. I thought i had it all fixed and again another issue. Cylinder 1,2,3. 01-23-2023, 09:41 AM. He has a 2018 sti that he purchased new. MHD Flasher is the first Android and iOS handheld application to bring ECU tuning and monitoring to the BMW N54, N55, S55, B58, S58, S63 and N13 engine. My idle is always rough, doesn't matter if its cold or warm. all new spark plugs (step 2 colder gapped to Originally Posted by e90_guy. Got a rough idle on your BMW N52 engine? In this video, we diagnose using INPA what our MAF values are and then smoke test the engine to check for vacuum lea About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Nov 12, 2021 · iTrader: ( 0) Had cold start deleted for about ~6 months, first on stage 1 bm3 and now on stage 2 bm3. This only started happening after the dealer replaced my exhaust manifold assemblies and Apr 19, 2017 · Tunes/Tuning: The N54 is run by an extremely complicated ECU (MSD80/MSD81) and when you begin to tamper with this many things can happen After adding a tune, if you haven’t already, you will have to do plugs/coils soon as the increase in boost level taxes the coils further Oct 5, 2011 · Can go above 1000rpm while 'blipping'. Nov 28, 2015 · hey everyone, first post ever i was wondering if someone could help. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Feb 8, 2020 · I got my 2007 BMW 335i E92, cranks up but no start. While it shares design elements with the N54, its wastegate rattle performances are fewer and generally less dramatic. I get weird "pops" on cold start. If nothing is happening work backwards. The MHD Flasher reveals the immense margin of power BMW left on the table with the N54, N55, S55, B58, S58, S63 and N13 motor, while still retaining the sophistication of the original engine management program. Dec 5, 2016 · code 2A7C after Vanos replaced. I just picked up a 2013 328i xDrive F30 with the N20. What you’d be looking for is high pressure that bleeds off. When running a code scan via BMWhat App, I captured codes 2A7A ("Outlet, cold start Join Date: Nov 2014. this is normal situation. Nov 23, 2013 · The car has a slight miss / stumble / hesitation on light throttle which happens usually in 6th gear (or drive) highway driving at low 2500 or so rpm. Location: Mexico. Jun 19, 2013 · The exhaust flap rattles on my 2008 E90 335xi (N54) on cold start. Car on cold start has rough idle for some seconds before RPM goes back to stable mode, also car has hesitation on low RPM , or on acceleration. Driving e82, e72, e85, R53 Gone but not forgotten. can you please somebody check out my logs? I will be very happy, because i cant find anybody near me, who know N54 problems. Oct 27, 2020 · 1 post · Joined 2020. When i park my truck outside overnight it is not as bad as the truck high idles for a bit longer due to the cold temps. Codes that come up are all misfires on cylinders 4, 5, and 6. 2009 535xi wagon. Low/hard acceleration on idle feels like a misfire and lack of power from 600 to 1500 RPM. 800, 650, 400 (jerk) 700. When I drive the car and exceed 2K RPM The car starts to miss fire and the clever BMW shuts down cylinders. 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: Stumble on startup. With the car cold, pull the engine cover and check your CP (feel around for loose connections, etc), check your inlet/intake, MAF, airbox, O2 sensor plugs/wires, etc. I have her plugged in via CTEK Battery Charger. iTrader: ( 7) Cold start stalling, 35i. My Car is garaged, non heated so approx 0 C overnight. Had cold start delete on different exhaust setups including stock midpipe and downpipes and now on catless downpipes/midpipes, still no issues. . I have changed all spark plugs and coils several months ago as a Mar 17, 2010 · That reduced the hesitation to about 50% of the hard accelerations. Sep 15, 2016 · I think that might point to more of an ignition problem. Location: Philadelphia, PA. 94 after Index 12. May 14, 2020 · With the car off and engine cold, activate the pump with the cap of the reservoir off. e. My motor swap is almost complete so I'll check once I get it running (N55 though). And I now always get P29E0 fuel mixture code and sometimes P0171 lean code. -dom3. When I took it to a local mechanic he said it's the high pressure fuel pump that's gone bad. This only occurs for maybe 20 seconds or so and then it smooths out. iTrader: ( 0) Long cranks at cold start. In neutral and revving the car (above 2K RPM) < all is fine. It seems to smooth out and run fine after 10 or 15 sec. I had data logged during idle and showing: And im still not getting on bank 2 AFR 234. That car is gone and I'm in a (new to me) E93, N54. Hey guys, As the title states, there's something weird going on with my M2 (~850km). At about 5k miles he had the following mods installed by a reputable local tuner. I will post Datazap logs from MHD. They are gapped to . Any help would be good. Thinking- the car starts on the 72 or so psi from the in tank pump. Login or Sign Up Logging in Remember me Nov 25, 2014 · My car started playing up about 2 months ago, here is the problem. The car doesn't throw any codes, which makes diagnosis difficult. The below has been replaced/done. When I cold start it, it will idle very roughly and throw a CEL. Also running the GTS startup. Nevertheless, the car continued to kangaroo hop on cold start as I let the car roll along by itself in second gear without applying gas. Changing the plugs seemed to have worked for like a week or two maybe? Jul 20, 2019 · The dual VANOS is the system used on the infamous N54, and is very prone to failure in these engines. Jan 2, 2018 · Video included | BimmerFest BMW Forum. description: I am getting an occasional misfire when turning right. This noise has gradually gotten worse since I purchased the car 5 months ago and I Dec 30, 2011 · I have a 335i (8/2007) production 6sp MT. ) Here are the DEFINITIONS of Hex-code "2A79" per BMW Fault Code Lookup, first for N55 DME, and 2nd, for N54 DME (MSD80); Each Definition is followed by a link to the respective "Fault Information" sheet for that code in THAT DME: 1) N55: 2A79 | DME: Oxygen sensor behind catalytic converter 2, electric | mev17n46. My first thought was injectors so I pulled my plugs found cylinder 1&2 wet. You should also be able to physically see the coolant circulate in the reservoir. Doesn't always happen but it only happens during the morning cold start. . The car is a couple of months out of warranty (of course) with about Jun 16, 2015 · Rough idle on cold start (yes, ANOTHER thread) 2010 n54 79k miles 6MT. The Vanos is malfunctioning all the time, just you notice it most due to the cold start problems. Every morning the past couple of weeks, I get an odd cold start. I noticed a hesitation and roughness between 2500 and 3000 rpm under acceleration. Hey all, So I've been having this issue randomly where it would stall on cold start. In fact all 3. There seems to be some condition in conjunction with the truck being "cold" that is causing your issue. 5xtr, ID1050cc, AEM 320lph, aero FPR, iag rails and lines, cobb sf intake, perrin inlet, ets tmic Jun 29, 2014 · It is related to faulty wiring on blower motor for heating / ac systems. No check engine or warning lights, but I've felt/detected a misfire on some of these cold starts. I don't notice any loss in in power or economy as of yet. Let the car sit overnight and pull all 6 spark plugs and smell No dice. Jun 11, 2009 · If I start the car and drive for even ten minutes, it's usually fine starting up again for the rest of the day. Dealer suspected Coolant temp sensor and replaced it. My car has had a really rough idle sense day one of ownership, sometimes it stumbles so bad I thought I've been rear ended, it's that rough. To this day even after everything I've tried, I am still having misfires on cold start. Somehow it happens more often on slight inclines. Find the youtube vid - Basically hold accelerator pedal down for 10 secs with key in and ON but not started. Ran good for a week or two then started to act up again. Hi Folks, I've noticed just in the past couple of weeks that I'm getting what seems to be a slight miss and some roughness in idle immediately after a cold start. Didn't help. iTrader: ( 0) Cold Start Serpentine Belt Squeal. If it shouldn't move and does, use the duct tape. Car was a one owner, has 113,000 miles on it, and has a ton of maintenance done by PO. Feb 25, 2014 · Radiator fan turns on at cold start. When i start my truck, its a 2012 sierra, after sitting for a while it high idles for about 2 seconds then drops to normal idle and stumbles then it catches itself before stalling then smooths out. The engine cranks but will not start. Would I have to gap the spark plugs accordingly with the cold weather or is it possible that my some of my spark plugs have just puked? I maybe put about 500km on the new plugs. I haven't had it completely stall, but my automatic reaction has been to release the throttle. Before I started doing maintenance on the car it started fine but did have some initial hesitation, after maybe 5-15sec of rough idle it goes to normal and there is no idle problem when driving. Starts right up no problem, but after a few seconds (RPMS spike to 12-1500 which is usual in cold engine), it drops Mar 4, 2020 · Most cold start/ rough runnings are caused by vacuum leaks. during cold start/up to running temp/get worst driving for longer, the engine stumbles and hiccup with no code stored and it is happening very frequently. A new HPFP, all new injectors and new spark plugs cured itat least temporarily. #1 · Oct 27, 2020. Warm Start. It's about -20C. Mar 4, 2018 · More n54 headaches! (cant get rid of a cylinder misfire) I'm afraid to even bring this up as I'm expecting the standard responses to come flooding in. It doesnt feel like when injectors are bad and it misses a beat every few seconds, its just as if the engine is shaking alot. E90s can (commonly, depending on where you read) develop a leak in the evaporator. Gear WOT Can somebody checkout the new index 12 logs please? - Why im not reaching a 234 AFR? and why i get drop when i start cruise from idle to 500rpm please? THX So much for Oct 12, 2009 · The jeep starts easily. 56mm (. No codes show or are stored using the OBDII or JB4 reader. Location: Central NJ. 2008 535i, N54 engine, 140k miles. Join Date: Jan 2008. The car would accelerate through that range well enough but it was very annoying. Recently I have noticed a serpentine belt noise that sounds similar to a raspy sandpaper at idle, and chirping in 1k and above RPM loads. It is particularly noticable in 4th through 6th gear. Been trying to solve this problem for a week now. MHD "Cold Start Noise Reduction" Mode with BMS catless downpipes, cat deleted N54 mid pipes with Vibrant resonators in their place, and a Maddad Whisper axle Hey guys I have been problems with delayed start on warm starts then that issue wen away then all of a sudden on cold starts I will sometimes get a the half engine light and it will go into limp mode. I tried to get a video but the issue doesn't come through very well. Apr 23, 2015 · Cold start stumble. VC gasket. It is always the same 2nd bank i. Feb 1, 2020 · The BMW N54 is a 3. At cold start, my idle is very shaky. but in my case rpm dips at 750 immediately (and engine starts to work rough)then rises up to 1100 rpm (engine smoothening) and then finally drops 750 rpm. Cold starts fine, no hesitation or stumbles, requesting the 23/2400psi of fuel pressure. Turning off the car and trying again sometimes clears it, once warm it goes away. Nov 13, 2010 · 2011 Ranger 800 efi 300 miles on it. 0L inline 6 twin turbocharged, direct injected, gasoline engine produced from 2006-2016. Not many E60 5er videos out there so I hope I can help a few people out. I cleaned the throttle body, changed plugs, tested coils, no solution so thought to disconnect MAF sensor cable before starting the car after car rest This vehicle had a rough running on a cold start that felt like a distinct skip (misfire). I did the following work on it: Mar 16, 2022 · I'm still experiencing a stumbling idle. About 3 minutes into run time it begins to stutter/skip. Apr 22, 2016 · we all know at cold start rpm goes aprox. n54 cold start whine - any help diagnosing? Video included. This will happen at almost exactly the same distance from my start each day, or will occur even when I let the engine idle to warm up. Not as aggressive as cold start and it does not stumble as much. it's a cold start @ 40-50F ambient-- when I start the engine the RPMs pop up to ~1,200- 1,500, then within a second it stumbles, with RPMs dropping sharply -- 500 or less RPMs. Then when the rpms starts to decline back to idle speed (~700) i would feel it drop slightly below that for a split second causing the engine to stumble and the rpms would stabilize after that. It’s the first mass production engine from BMW to feature this technology together. On starting only when cold and left for over 24 hours the first start up is rough and stumbles and misfires badly for 10 seconds. When I turn the car off then on again it's gone and out of limp mode. 1974 2002, many various 3s. The PE mod essentially takes out the fiberglass chambers from inside th Jan 27, 2021 · Semi-cold start after I got out of work. What BMW’s Use the Dual VANOS System? M52 engine (’99-’05) M54 engine (’99-’05) S54 engine (’99-’05) N54 engine (’04-’10) Dual VANOS Engine Fault Codes. This is what has all ready been done. 5 N55 with the N54 type pump, my X5 shows around 4-5 mpa after shutdown. It seems to try to ignite, then sputters a bunch and slowly stalls out /w Each unit of measure is roughly equal to 150psi. Never had any problems at all or any problems with idle speed at startup. gear WOT c) MHD Stage 2+ Index 12 - 2700rpm 3. You have already done many of the common causes. If I keep trying it it will all of a sudden start like normal. I wish it was close by so that I could help you out. Explains the procedure and steps to find the root cause of the pro Originally Posted by 2e9x's. Oct 1, 2023 · a) Cold start with Index 12 b) MHD Stage 2+ Index 12 - 2500rpm 3. Performance, mileage and who knows what else is suffering due to this. But once it's warm the car run fine. BMW e90 / 330i model 2010 , European version. No need to go crazy on a thermal anything. So to help avert some of those, let me state my problem, what I've done, and what I've researched. Dec 30, 2020 · Car won't start No crank n54. Gear WOT Sep 5, 2017 · Originally Posted by wardy335i. The BMW N54 engine utilizes a twin turbo, direct gasoline injection design. bmw n54 index 12 injectors - auto parts - by owner. Remove the intake muffler and disconnect the mass air flow sensor so a rubber cone adapter can be inserted inside the intake boot. - Starts up instantly, yet at idle resting you can slightly feel shakes or misfires. I don't think it's injectors or coils. On <12. I have been dealing with issues on my car for a few months. Occasionally on a cold start if I immediately (within 10 sec) put the car in drive and start to drive away the car will stutter and almost stall out. I've replaced Injectors to Index 12. i have a bmw 135i N54 DCI bmw performance exhaust and COBB stage1 and i have noticed sometimes after some WOT runs all the way to redline when i come to a complete stop after 10 seconds the HPFP shoots up to 2,200 PSI and sits there and after 10 seconds the injector(s) start to tick louder like its being put under enormous Feb 13, 2018 · It primarily happens at idle. When the initial cold start fuel request goes down to normal idle range 7-750psi, at that moment as soon as the request changes in the computer there is an audible tick/ping from the engine pay. If nothing looks/feels wrong, and you have no codes or other symptoms, there isn't much to go on. I'm brand new to the e90 game. Start up Nov 6, 2008 · The cold start issue is just part of the problem. Cheers. P1520 – camshaft position actuator Jun 25, 2021 · This 2008 BMW 335i has catless downpipes and the PE Mod done to the factory mufflers. The radiator fan turns on at cold startup. Car ran fine for about two days then again would not start without any crank. 0-liter, inline-six, single-turbocharged engine is like the N54's younger sibling, inheriting both the good genes and some of the quirks. What do you think is wrong? Mar 2, 2015 · When I initially start the car after sitting for 5-10 hours cold it will experience experience extremely jerky acceleration like power is constantly being cut until about 3-5km into the journey in which everything returns back to normal. Happens at about 140 degrees engine temp. Feb 20, 2021 · Mhd cold start delete. Now it seems like it does it every cold start. Feb 16, 2015 · On cold start it will stumble after a couple minutes between 500-800rpm. My F80 M3 has just started to misfire on cold start only, have fitted Akra DP and M Performance exhaust. Jan 4, 2019 · Member#: 320853. a) Cold start with Index 12 b) MHD Stage 2+ Index 12 - 2500rpm 3. Any help is greatly appreciated!! Jan 6, 2020 · N54 misfire diagnostic help. Dealer warrantied the part because i bought it from them. Apr 28, 2017 · HI. Oct 4, 2023 · This 3. Hey everyone, I own a 2007 335i with 99k miles on it. Sep 30, 2021 · 300-335 HP. Appreciate 0. If any are > 8%, then you have a vacuum leak. On all JB Maps. I have a 2008 335xi with a misfire on cylinder 2. Whenever I cold start for the first 5-8 seconds, the car feels like it's stuttering; you can feel the engine shaking before it stabilizes and the cold start resumes Hi, guys. 6 speed manual. No codes. Well I am taking the car in on Saturday to look at the starting issue. The engine RPMS briefly drop, seems to stumble/hiccup and vibrate about . Once the car gets to operating temp, it will either start running perfectly fine on its own, or after a quick restart. The low temperature morning starts have really accentuated some issues with my engine. Been chasing a cold start misfire and popping on idle with my N54 since May when I took it out of storage. As far as I know, it pretty much holds there while it sits. I think this is normal since others with N55's have reported similar behavior, and that this is BMW's way of dealing with some of the challenges that cold starts with direct injection presents. It has warmed up a lot, is -4 now. My idle no longer jumps around at all while in neutral, but my car still has a lot of trouble during a cold start, really sounds like it struggling to stay running. Jan 22, 2015 · On my 2010 535i with 59,000 miles, I got a half-engine light (i. 20 second stumble on cold start 2018 STi. Only on cold start. As the engine oil heated up, the idle quality got noticeably better. iTrader: ( 0) N55 Odd Start in Cold Weather. Here's what happens: on a cold start, as I've described it, the starter will turn normally--though it seems to turn a bit longer than usual before the engine will fire up--and then, just as it does fire up, the engine seems to stumble Nov 4, 2015 · Originally Posted by slowie. If it throws an immediate code when started that indicates throttle malfunction reset throttle adaptions. It's happened maybe 15 times now over a few months. Recently upgraded from my old N52 E60 530xi Dec 4, 2015 · Location: USA. Here is a clip from a cold start. Start it back up and its fine. It'll still throw a misfire code during a cold start. 022 ). It will sputter maybe once every 10 mins of cranking lol. Lately I have been having cold start problems. If it doesn't move and should, use the WD-40. Everything is up and running, but at idle the car seems to stumble, with rpms dropping suddenly. I experienced rough start-up and idle bumping up and down (500-1200 rpm) for about ten seconds during the last cold snap, it was 23F in my garage. Temperature in mornings is around 70F or 20 C. Today the engine light came on. Checked all relays, fuses, and what not. It evolved into misfires across all of bank 1. Starter went out so I replaced it along with the intake manifold gaskets. Instantly replaced the two injectors with brand new ones. - Replaced a semi leaky valve cover gasket. recent work completed related to misfires: low pressure fuel sensor, new plugs, new coils, new turbos, new o2 sensors. e 4, 5, & 6. 1100 (at cold start)and after few seconds drops at 700-750. I traced voltage, checked fuses/relays, and even pulled the new starter out to make sure it was working. If it's really cold it even stalls. Drives: 2009 Montego Blue 335i XDrive. You've fuel slowly leaked into the cylinder and that's why it only happens in cold start. iTrader: ( 0) Slight Stutter / Rough Idle On Cold Start. All 3 of my 335i's have had this issue. Nov 2, 2015 · iTrader: ( 0) Stutter, almost stall on cold start. You should be able to immediately and easily hear pump - even a quiet one. Sometimes it just stalls completely and needs a restart. Dec 1, 2021 · BMW 135i N54 Cold Start Rough Idle (fine when JB4/MHD removed) Hi guys, I've been having a problem with my car for a while and have replaced loads of things to no avail. In the last couple weeks, after it's been sitting overnight -- i. Got a rough idle on your BMW N52 engine? In this video, we diagnose using INPA what our MAF values are and then smoke test the engine to check for vacuum lea Feb 2, 2012 · Just saw a used set pop up on Craigslist today. The length of time cycling on and off seems to correlate to the temperature. iTrader: ( 4) 335i Cold Start - Occasional Stalling & Startup Issue - updated. "Engine Malfunction" or limp mode) light associated with rough idle which was particularly rough when the engine oil was cold. The car now runs but wont rev up and the revs are jumping constantly. Your car returns to normal after the excessive fuel is burned. E82, N54, 6MT, 117k modded miles. Hi all, trying to help a friend out. With a hot engine at idle, check the fuel trims. Fortunately repair is a lot easier. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. Idle jumps up to 1500 and down to 1000. 2 weeks of trying now. The personal experience with my 2006 @ 135,000 when it’s colder out is that at times the engine runs mildly rough for a brief period while warming up then as the idle drops it evens out to a natural purr. It is what many others have said around here, the morning starts and when it is cold at night take a good 5+ seconds to fire up. Same with me bro my last 335i had injectors replaced so many times and even after the car ran like shit so they bought it back and now i have an 09 sedan with barely 5000 miles on i alrady had During cold start the RPM's would jump up to 1500 and stay there for 15-20 seconds. Note when not at full throttle a typical value is 5 or 750psi. If you rev the engine to 3,000 rpm for 30 seconds and the short term trims reduces, then it is a 2008 e92 335i n54 cold start spluttering and eventually limp mode. The car starts with a kind of stumble into idle too (clumsy start), and it stalled about a month ago on me (fully warmed up. the car will feel shaky and feeling of misfires seem present. So if you go by thatthat means we can rev it up to 2kish for about 5 secs and that should burn the excessive overnight fueling. Needle just keeps hunting for rpms. rz pr sj fy bg ch sd sy sk km