BMW 318i E90 misfiring cylinder 3... Already had parts thrown at it... Fault finding and repair... 

This engine injection is very troublesome almost every engine with these injectors I have seen suffer from misfire.. I am in the process of diagnosing my N43 for the same issue, I have eliminated coils and spark plugs now that I have swapped them with new ones. Next is the injectors. ->> also wanna say it’s always worth checking the vanos selinoinds as they are cheap to fix (wither clean them or swap them) and could also cause rough run. -> Another one to check is the MAS as this also can cause it.. Good luck 🍀

It looks like injector no.3 is the initial fault which then fouled the plug causing cyl 3. to become wet with unburnt fuel. This fuel will then contaminate the oil as it passes the rings so an oil change is definitely recommended. I hope the wetness in 3 was just fuel / carbon and not oil but this would need to be monitored. great work as usual.

The best diagnostic video I've ever seen! Congrats man! I suffer the same with my n43. Lovely, brilliant video, don't stop recording you've helped a lot of people I'm pretty sure!

Thanks for a great video and the thought process. I can also agree that the car needs funds to completely fix the problem. The root cause is mechanical, the misfire will return after a while since there's an excessive oil leak in cylinder no. 3, which will overtime cover the spark plug electrodes and prevent it from firing. Another thing that needs to be replaced is the leaking injector. Thanks again for these great videos

I literally have same issues on my 320i And I got new spark plugs put in but I still having same issues, I bet they used bosh plugs and sent me on my way. Amazing video, can learn a lot from this. Well done 👏🏼👏🏼👏🏼

I am not trying to be that " smartass " Luis because it happened to me 5 years ago on a Audi but I was thinking why you don't check for spark. Believe you me. I have never forgotten my own neglect. Great stuff Luis. Edit, I just remembered that last year I changed plugs on a Volvo and I drove the car outside without any problem and when the client picked it up only 3 cylinders were working.

Hi Luis. I’m pleased you managed to finally identify and resolve the rough running of the engine with a set of quality spark plugs. The car overall needs urgent servicing which you have already identified some of the faults. Great video as always. Keep up the good work 😊

Great video i have a problem with my e93 bad starting problem misfire cylinder 3 and 4. Changed spark plug s still missing

Good job Luis, dont worry about making the wrong-ish call. I am definitely not your engine guy but the injector leakdown and the oil on the spark plug is surely an issue. You fixed it spot on for now but were right in seeing something coming...

GREAT JOB well done best video i have seen so far i have a question for you does the 318i E90 2010 model have vanos non return valves if it has can you locate them for me please thanks.

Brilliant job ! I wish i could bring my car to you. I have the same problem on my N43 engine.

didn't have to buy a new injector. Just ultrasonic clean it. Did that to my impala. Had #6 misfire for the longest time, checked plug, coil, compression, all good and finally decided to clean the whole injector rail in the ultrasonic cleaner. Runs like a new car now. Even with 600000 km.

Great video Luis. I love case studies like this.. carrying out tests to eliminate probable issues and finding other issues along the way. Fantastic stuff! :) Look forward to your next challenge

So to conclude, the misfire was due to a leaky injector causing both fouling of the spark plug and sulphurisation of the catalytic convertor? How quickly would this recur if the plug was changed but not the injector? I think I may have this problem, although I changed the NGK spark plugs a year ago (8k miles). I have the cat sulphurised error code and a cylinder 3 misfire / injector code with very rough running and stalling last few days. Compression test was fine, when all 4 coils (Bosch) were replaced a couple of months back. UPDATE: Pulled plugs with some fouling from leaky rocker cover seals and replaced with new NGK plugs, but rough running / misfires still there - now reaching out to a petrol injector specialist for advice.

As youve said before.always start with the basics.

Morning Luis. Thanks for another Sunday morning vid. Perfect timing as always 🙂👍Gives me an excuse for another cuppa lol.

Great diagnosis. The Bosch plugs are listed as compatible for these engines (N43) but they're not. It's best to buy the NGK one's from the dealership as there are lots of fakes out there too.

Had similar on 118i, who would of thought tiny little differences would have caused this, but they have, when I contacted my go to supplier (SDL) NGK spark plugs where there only choice as to where Eurocar parts, so why the customer was supplied’Bosch’ spark plugs I’ll never know

No need for compression test with that much oil in the cylinder. However, been there, done that. Fowled plug due to bad injectors and or fuel and looking in all the wrong places. Fact is in this type of work we tend to go for the big problems and sometimes miss the obvious. Had a Renault laguna thia summer with a no start condition. Car went around to four other shops and nobody changed the plugs. Put 4 new plugs in it and it started right away. Just wondering if Cylinder 4 will be in this condition soon probably.

Excellent video. This is exactly how trouble shooting goes. The manual never tells you that every car comes with a few red herrings. The BMW owners manual never mentions these cars come with a whole trunk full of red herrings. And how smart have we really got when the computer can't tell you one of the oldest motor maladies ever, fouled spark plug?

That's why sometimes it's just best to start simple and keep it simple just unplug a coil and swap them around and do the same with the spark plugs if it still misses after that that way there's no confusion.

If you use a fuse loop and an amp clamp also the ignition as a sync you would be able to determine with a scope once the firing order is identified which injector is leaking .That would save you a lot of time and it is accurate.

I think there is no problem with the cylinders, because the spark plug stopped ignition, back pressure could not be obtained, the pressure at the bottom carried the oil up.

I have a e92 320i, water pump would over run and drain battery, so replaced that, found the ecu was drowned so replaced that, got a misfire on cylinder 4, mixture contoll problems, has compression tests, smoke tests, plugged into a snapon tool thing and just reading misfire on 4, moved coils around made no difference always on 4, bought 4 new injectors, and 4 new plugs, still same issue, massive misfire on 4, pumping out black smoke from the exhaust thats coated my wall of the house throughout all the testing, adaptation resets etc. Getting some new coil packs today, so far ive spent £1500 and still have the misfire. Car is undriveable, just billows black smoke, no power whatsoever. Was also getting a lot of smoke from engine bay under the water pump.....its not the rocker cover gasket as i changed that 2 weeks ago due to what i thought was it leaking....but the smoke may well be from oil leaking elsewhere onto the exhaust manifold or cats. Proper weird. Probably gonna have to scrap it.

The first step to check a gasoline engine is checking spark plugs.but any way you found the solution just spent a little bit effort.good job

great video i used your video and explanation with my BMW thanks!!!!

Another brilliant diagnosis

Really interesting trouble shooting, thanks.

Pressure control valve? it could be letting oil from the engine into the airbox/inlet manifold and fouling the plugs, which would caouse a misfire and unburnt fuel.

Amazing job , thx for this great videos , you are a very good and pro technician Thx a lot

I'll be surprised if it doesn't come back in. Same scenario with the new Audi/VW direct injection junk. Misfires caused by leaky injectors and oiled plugs. Washing the bores with neat petrol. Screws the rings and even cracks or holes the piston skirts. Nothing to really be seen with the boroscope, except maybe a bit oily in the cylinder. Relative compression tests seem to show better than the normal method. Not always shows low compression but oil does find it's way back up and foul the plug and misfire returns. I suppose the excess oil getting up helps disguise during the test. Last one I saw a month or so ago was 19 plate A3 with 19k on the clock. Quality 👍 With regard to the difference in the spark plugs, I've seen bad misfires on diesel land rovers when the copper injector washers are the wrong thickness. I mean like 0.2mm too thick. You wouldn't believe it.

Great video, as have the same issue. The oil that's fouling the plugs would indicate a new head gasket?

Great video, i have the same problem on my n53b30a engine. Its driving me crazy, change the sparks, coils, nox sensor, still check engine light is on, now I order six new injectors, if it still continues to missfire I I'm gonna set him on fire the whole car 😂

Friend have the same problem, he has cylinder 1 misfire and also the denox sulphurized..

Im sorry but i gotta ask when you reset the adaptation do you reset all of it, because you kinda skipped that part.. im working on a N43 and its cracking my head thinking what it is the issue but now i have something to look on to tq for the great video on diagnose and i would be really helpfull if you would answer my question.. hai from malaysia 🎉 🇲🇾

Great and very honest video , thumbs 👍!

Wish me luck, im chasing an misfire cylinder 1, only under load tho, 2 -3k rpm, plugs and spark done so far, i have injectors next, but after that, stumped

Ah! Gotta love the gasoline engines. Some sparks, air filter, fuel filter and some oil and you're good to go! 👍

Good day Sir please make a video resetting dme working hours on e90s or f series thank you

Well done Boss I have really appreciated

Spot on like usual!!!! Well done 😊

Thanks for video Luis👍💪

I will try on all your videos if I have to. Please take my Renault espace !

Hello, I have N43 320i and problem like you, but on cyl2, shaking engine only when cold first start. First 10sec ok, than shaking. More cold, more shaking. If I start engine again, problem is out. Operational smooth values on cylinder 2 goes over -1000 and MIL lights up. New BMW spark plugs (4pcs), swapped coils between all cylinders, new injector, new IGBt transistors in DME. New hydraulic lifters. Combustion space is clean. Now, there no MIL light, but shaking is still present. Cyl2 rough run value peaks about -500 and then calm down after 30sec. Injector 3 is very slightly leaking, but problem is everytime only on cylinder 2. I do everything like you, but no fix. Is normal if cylinder 3 leaking, the cylinder 2 operates with mixture (over -500....-1000....-1200....) for good smoothness? After a 30 seconds all normalized. I am totally confused. Thank you.

hi luis when i swap coils i always swap the plug if i move the fault i then move the coils only back to see it the fault moves with it or not even if a new plug had been fitted move it because NEW stands for NEVER EVER WORKS untill proven

I think that they replaced the spark plug and they drove it a long time with it broken and the injector then got a chance to overfuel the engine and over time wear it out when it comes to codes you have to think as the saying goes who came first the chicken or the egg.

Sometimes it’s just that simple. Can you do a video of how to code injectors using the autel?

Very good luis👍👍👍.

Very helpful video

I have same problem. i do all things as showing in video but. I’m still struggling with this problem.

Great video man

That slap on the forehead made me laugh my ass off. There has been soo many times that I have done that myself lol

Hello, every time I remove the spark plug of cylinder 1, 2, 3, my car comes out with a lot of fuel, and it malfunctions and the fuel consumption is high. spark plug, coil, pump and injector have been replaced. What should I do with the change?

Hey! Can you help with a question? I have this same engine, n43b20a. And it has compression of 100psi/7bar on every cylinder. Is that good enough compression it to work properly or not? Whats the compression in that engine when its new? I cant find that info anywhere! 🙂Thanks if you can help!

I heard you saying: resetting adaptation values. Can you explain how you reset the values for this car? Thank you!

If the cylinder was running lean most likely the ignition coil was overworking as a result being damaged.

شكرا جزيلا

Are all BMW 4 cylinders like that because they just don't seem to be very good at least the diesels are not but I don't know are the newer ones any better It's just something I've read before.

Hey , Can you replace only one injector or all 4 at the same time? How much it cost each?

Great job👏🏻👍🏻

Top video. Thanks

this car might be back soon. the leaky injector would kill the new plugs soon enough just like the ones you replaced and if the owner keeps just changing plugs, it will ruin the engine from fuel dilution at some point

Gold

I have just bough a used 318i automatic 2010 and it had a yellow engine light. Diagnosed with misfiring in 2 cylinders, needs spark plugs and coils. Also needs water pump change. Exhaust manifold needs refitting as has been worked on before and it is leaking smoke so causes noise. The engine light is not always there, but I could smell petrol from the exhaust. It also sounds like this car. How bad are these faults? if the car company will fix them should I keep the car or try to return it?

Pardon me for commenting again just wanted to ask the fault code on my N43 was misfiring on cylinder 4, but then when i did the shut off test on each injector using scanner the cylinder no 3 was the one acctually misfiring.. could there be some underlying issue because the scanner said its cylinder no 4

I would check oil level for overful, then exhaust emissions, and suspect oil ring on number 3 🤔

Wet spak plug is the damage?

So, new head gasket, injector and injector gasket for no.4 injector. Also that catalic is fulfiled with oil.

Good work

plug looked like valve guide seal leak

Brilliant

👌👍

Hi mate I got similar problem but mine is cylinder 4 misfire but only on cold start ones it's warmup up it drives like a dream car please can u help thx?*

Hello. I have a BMW 318I and the problem is that when cold it runs smooth but when warm it starts shaking. The error gave me a miss wire 3 and 1. Can you tell me what it is? Thank you.

Hi Sir, is it possible to request your service for my car?

Another prime example of something new doesn't mean it's good

Made in Slovenia coils😃

You must know, much duel destroy sparkplug, and overheating katalitic konv. Or give vode po420, insuficijent cat.

Hi,how can i reach you sir.want to ask something about dsg7 dq200

I have a problem in my citroen c4 2016 i was fixing the solenoid elctrovalve finished fixing it , i tried to turn on the engine ,the car won t start a fuse blew up i change it the engine starts but the car give us messages engine and gearbox fault need repair I puted on scanner there are 17 bsi fault so how should i fix this problem

Where do you get the electrical schematics?

Hi guys i have same problem with my 318i cylinder 1 any one have proper Solution?

👍🏻👍🏻👍🏻👍🏻

Wow lol

This car will be back for a cylinder 4 misfire soon if he won’t replace the injector as it will foul the plug

Do they drop them off to you Luis and run off because they can't fix them😄