BMW M54 Common Misfire’s,Rough Running & Vaccum Leak Symptoms Explained 

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Nice run down on the m54 rough idle faults still a good engine if maintained correctly I know some may disagree I never had any issues with my 330 apart from needing a new rad. Keep the great content coming dean 👍🏼

Good thorough video on e46 all very very common problems.👍🏾

Finally a gentleman who is very informed and and takes care to explain possible root causes and not just replace, replace, replace. Well done!

I’ve got a M54B30 swap with some random misfires. This video helps a lot. It seems to be random.

Love'em Dean Just changed oil had a whole 1,600 miles on it I don't get to drive it much. Need to do a Italian tune up on the highway. 👍

Knowledge is Power. Thank you for a great tutorial.

Great job. 👍 also, the brake booster can cause a vacuum leak. If you hear a hissing sound from inside the car with the radio turned off and the car running it could be the brake booster.

Good video mate. Keep it up. 😎

Have e60 m54b30 for a year now. First missfires were caused by ignition coils and spark plugs. Recently got P0 and lean codes. CCV has been changed twice in the past year. I hope the guy who will check this for me will find the issue.

I got a surge/stall issue, only on warm up from dead cold. No codes, only happens when in closed loop, looks rich, like it’s choking out. Smoked, no leaks. New ISC, CCV, CMP sensors. Will test the purge today.

I believe you you forgot to mention the mass air flow sensor. I had I misfire on cylinder 3 on cold star for as long I can remember and it was only on open loop until someone told me about the map sensor that they tend to go bad only when the engine is cold and he was right cause I change everything you mentioned on ur video and I was still getting cold star misfire until I replace the map sensor and now it runs like new .but thank you any way for ur information very helpful indeed

Hi Dean, in one of your videos about PREVENTATIVE maintenance (M54) you say that you changed your vacume hoses for silicon and gave the id measurement, I have spent ages trying to find it with no luck, would you be kind enough to let me know the measurement of the id so I can buy the silicone tubing before I pull it apart. Grwat videos thank you.

Anxiety away through the roof Will a scan tool identify this? My e46 has a single cam engine Very informative video all the same👍

Great video mate 👍, I'm sodding through a misfire problem on my 98' 535i 😢, can you recommend a cheap diagnostic set up for this car? I have the adaptor to fit it TO OBD2, there's so many available and a lot are useless. Any advice would be great mate, cheers 😀

First off al thx for your vids it has helpt qiet a bit :) i have a question i hope you can awnser my car is a e39 m54b25 2001 i have this issue thats bin bothering me for a long time, the car starts and runs fine on the low end but when it revs to 5k rpms it shuts of cyl 4 5 and 6 it ised to shit off only 5 and 6 I have read the codes and when is goed into limp i can reset the ecu and it wil run fine again , i have done vacuum test i have replaced coils and plugs also tested the o2 and switched to another one stil the problem remains i have switched the wire harnes of the coils for one i know is good ( I thought faulty wires) problem remains. Only option i think i have left are injectors or feul filter/pressure regulator ? Codes are p01349 p01351 p01353. I wil switch injectors with bank 1 to bank 2 to see if the problem goes to bank one then i know its injectors. Greeting from holland keep up the vids 🤙🏼

Great video, could you please do a video on automatic transmission fluid change and any upgrade parts which are required for m54, I have seen many with failed safe trans message and loosing reverse gear.

Theirs a car (e46) at this auction near by do you think it would be a good buy if I get it for 300 bucks? It has check engine and can tell it’s misfiring let me know if should by and welcome the bmw to the family

Hi iv got a question I have a bmw e46 325i 2003 what the best make for ccv ? And what’s the easiest why to change it

Put a new intake manifold in as the old one had a hole in it on my m54 2.2 changed all the pipes and New Ccv system installed the car is throwing up codes p0300 p1349 p1345 p1351 what could this be in parts? Do you think it’s the DISA value or something else?

Hello, I have problems on cold start for a few seconds the idle is rough, and afterward everything is good i would say. All glow plugs are changed and the relay too. Can an oxygen sensor be faulty without reporting an DTC? What is the best way to test it, can it be cleaned maybe? The car is E91 LCI 318D 105kw 11/09, it has only 1 oxygen sensor I would say only on the DPF, next to the temperature exhaust sensor and the pipe for pressure sensor. Thank you for the answer in advance.

My e53 cranks but wont fully start the tempeture goes all the way to the right before even starting misfire on cylender 4,5,6 any solution ?

I have a bank 2 , fuel range exceeded code and I have did everything to possibly finding a vacuum leak but come up short, with no results. What do you think it could be?

Hi bro I have a lil problem can you explain camshafts I’m in uk so I’m trying to get my sensors but I’m not sure about this one 2.41 DME: Signal, Camshaft Sensor, Inlet I’m trying to get it from eurocarparts and I’m baffled a bit I want to get camshaft position sensor and exhaust side I would like to change all sensors at once so can u please tell the best pronunciation off the sensors

hi mate I have e46 2003 convertible the windscreen is leaking fluid I've replaced the washers twice and its still leaking do u have any other suggestions

Hey man, my e46 started shaking about 5 days ago just all of a sudden there in the morning. I took it to my mechanic he checked all the coil packs which were fine but my spark plugs were really wore and I only replaced that 3 months ago before this all happened. Then we put in fuel cleaner for the injectors as he thought maybe it was that and after that as I drove my engine light even went off and it was running all good but not even the next day it the light came back on and the shaking started again. It's still shaking pretty good and it's on and off so before I take it to bmw would you know maybe what that could be? Thank you so much if you could reply

The part @ 5:30 of your video again please boss? I hear major air noise right from that area, and I don't ever remember hearing it like that. I already had to change the valve cover gasket (never changed in 21 years) due to oil in the plug wells. Its running better. I also ran and put in some STP waterI th remover and put in 100% pure gas (NO ETHANOL). Its running better than before, but the codes are back, and its still missing.....I think the part @5:30 where you start about it is a problem too.

my 1999 e46 starts ok but after a while it starts to misfire and i have to stop turn off and then on and continue driving, any ideas? the couls seems.to be good.

Awesome vid man. My m54b30 runs awesome, idles fine cold or hot, but when left idling for a couple of minutes it missfires... As if One cilinder is off and running in 5 only. Turn it off and black on, and its ok again... But only does this when left idling for more than a couple of minutes... If you are driving or reving just so slightly, it never fails... Any clue? Thanks

Did the bmw E39 2000 model come with a catalytic converter?

Hi mate I’m getting really rough idle, loss of power, engine light on and misfire in cylinder 3 and 4 with fuel cut off. Compression in the chambers is fine, have swapped plugs, coils and injectors around, cleaned and tested all injectors and still doing it. Any ideas? Thanks

Is it effective rocker cover gasget issues to air leak

my 2001 e46 320i, m54b22 engine it start fine no rough idle though when you hit about 5k rpm it tripps and start to serge and then the car cant seem to gain power like the rpms sputter and tell i shut the car off and back on and it fine. seems like it get fuel cut off at around 5k rpm

any idea why could my m54b25 e46 compact be runing sometimes badly, like it runs good, but then randomly it starts to change its rpm by itself, and even runing in 3rd gear, u press the gas it goes goes and then like shakes and lowers the rpm and then hits the rpm back to where it changed. Sometimes the car loses power out of nowhere and doesn't run like it should, and when pressing full pedal to the metal in 2nd, it doesnt accelerate fast as it should, but when that dissappears, it runs great and has full power again. I really dont know what to do, ive changed the spark plugs, the filters, checked vacuum leaks, changed the fuel filter, checked the air boot for some leaks, nothing, no error codes, only sometimes when it loses power it shows something w abs and traction control

Iv got a e39 520 2.2 2003 and I'm getting fault code for cylinder 6 and cylinder 2 misfire with fuel cut off

I apologize guys I replaced almost everything on my 04 330ci, Hey Doc .the biggest issue I'm having now the brake lights stay on, oh and license plate light stays on constantly. I have taken and replaced fuse and the brake switch. The kicker is the left the switch out purposely . I replaced the 4 wire harness also. With the switch out the brake light still stayed on. Help please. Thanks John Crump

I have rough idle, loss of power, lower mpg, Code P0174 on bank 2 only... Any suggestions? So any of this can cause the only code P0174 bank 2?

I have a 95 325i with no start will crank but when tries to start it backfires bad through intake

My e46 525i has a problem of behaving as if it's out of fuel when there's still more than half tank in it. But just when I top up gas..the performance is back to normal until I've moved the distance equivalent to the amount of fuel I've put it..my Guage also never goes below half.. What could be the problem?

Where are you based? I have rough idle issue on start I’ve changed spark plugs, injectors no luck also the car feels slow to drive Bmw e39 525i

on idle my e46 runs super ruff . I unplug the maf and the car dies out like normal. Turn it back on with maf unconnected and runs perfect. Any idea ? Throwing both p0171 p0174

I finally retired 330i today! Engine is perfect but rest car shit

I checked everything else it must be my o2 sensors

How would you diagnose p0420

Anyone here had very rough idle and Missfire Cyliders 4,5,6?

This m54 engine is plagued with oil and coolant leaks and misfires; not to mention badly designed piston rings. So glad I got rid of my 04 530i e60 for my ‘13 328i xDrive n26 SULEV F30.

Would you mind helping me diag mine? :D

What could that be

So, basically it could be 50 different problems. Not your fault just the way these cars are.

hi, can u speak slower and more clear please as your films are ok but u talking to quickly and to many things at once..