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Discussion Starter · #1 ·
Morning guys,

I could really do with some advice please.

I've had a on going issue with the car for a few months which happens when accelerating or sitting at a speed on the motorway it almost judders/slips for 10secs and then drives normal again. Almost feels like the clutch is slipping but revs are fine. Been doing research but can't find nothing apart from transfer case. All tyres are standard I'll get the sizes and input shortly.

I did change sparks to see if this helped but remained the same and 2 coils (annoyingly aftermarket)

But the main issue I've had yesterday was driving on motorway felt the car juddering like a misfire. Get to traffic and it started shaking bad. Pulled over to check coils etc typical one of the coils once I removed the rubber boot stayed behind !! Managed to replace this after several hours as it was the rear cylinder. I got a light on dash "Drivetrain" as I was moving the car off my dad's drive before I swapped over the coil. After it was changed I plugged it into my laptop and got this (hopefully attached)

So thought let's check the coil etc and guess what !!! The new coil boot got stuck again. So got the old OEM coil I kept and replaced with this now. So all OE coils. Quick diagnostic and it came back with cylinder 1 spark not firing the same. Needed to get car home so now it's misfiring !! Got home replaced the spark with the OE spark and still the car is juddering.

Sorry for the long essay, hopefully someone can advice me with any information or just to try something.

Appreciate it alot guys
 

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Discussion Starter · #2 ·
The attached with only 1 fault was there after all coils were reverted back but sparks remained the new ones. I did try the OE spark but still was juddering. Fault deleted but still no joy.
 

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Try swap the coil with one from a known working cylinder and see if the fault moves. The replacement coil could be faulty. Also use another new spark plug just so you can eliminate that too. Have a look at the wiring on the crankshaft sensor just for inspection. I always clean any sensors when faults like this happen, just in case. Things like MAF, MAP, inlet/exhaust camshaft sensors, throttle body, ect.
 

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Discussion Starter · #4 · (Edited)
Try swap the coil with one from a known working cylinder and see if the fault moves. The replacement coil could be faulty. Also use another new spark plug just so you can eliminate that too. Have a look at the wiring on the crankshaft sensor just for inspection. I always clean any sensors when faults like this happen, just in case. Things like MAF, MAP, inlet/exhaust camshaft sensors, throttle body, ect.
Thank you Tcon

So I did try the coil swap but didn't show any improvements. It has been into BMW which they put it down to be a failed Injector 2 ! They also done a software update. Phone call to say it's done and ready to go.

Paid £630. Jumped in drove to work and guess what petrol engine kicked in and it's exactly the same as before / even worse ! The kind people are BMW also damaged both my doors in the exact same position.

Tried speaking with SM, long story short "it was working when the tech drove it so another injector must of failed" the damaged doors are my fault as I left the premises even though I noticed around an hour later with photos taken. They even left the fuse panel off in the boot off.

So yeah never will I go to a main dealer again. Plugged in ISTA it has come back with failed Injector 1&3 so I'm going to change them myself. The car is completely not driveable.
 

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Legally they have to keep all videos for a time period of a month+. I would get a solicitor to contact them to make a request for the video footage and until that happens inform them yourself that you are making a legal application for the footage so they know not to deliberately delete it. This will let them know you legally intend to look for compensation.
Then tell them you want a refund and the damage repaired or you will take it to court. I can assure you they will not want to go to court as they know they will not win this and it will end up being too costly for them and there reputation. Therefore they will fix the car properly.
 

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Discussion Starter · #8 ·
Legally they have to keep all videos for a time period of a month+. I would get a solicitor to contact them to make a request for the video footage and until that happens inform them yourself that you are making a legal application for the footage so they know not to deliberately delete it. This will let them know you legally intend to look for compensation.
Then tell them you want a refund and the damage repaired or you will take it to court. I can assure you they will not want to go to court as they know they will not win this and it will end up being too costly for them and there reputation. Therefore they will fix the car properly.
Again thank you Tcon. I literally can't believe a massive organisation would even be this way. They told me they only record when the car comes in and not when it leaves ! Joke. I'm definitely going to get in contact for that recording and let them know I will be taking it further.

#update.

Injectors changed but unfortunately the car still runs like crap. Non stop juddering. 100% undriveable it's been sitting on my drive for over a week now 😭.
Getting sick of it.
Turns out when coding the new injectors entered the wrong number, can't see that causing that must of an issue if BMW was correct in saying its likely the injectors. So I'll recode tomorrow and see what happens.

If anyone has any ideas please do let me know.
 

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Discussion Starter · #9 ·
So all injectors coded, but still runs like crap ! I'm losing it with this car now.

I've performed another misfire test on ISTA which came with again with:

Mixture deviation check*
"The check was terminated due to the cylinder cutout"

Any ideas what this would be guys ? I've done the test several times and the above section comes back everytime but everything else is ok.

The results I get are:
Product Font Communication Device Software Screenshot


But this was the injector changed by BMW :oops: so just to check I've replaced with an old one but yet again comes back with the same fault.

Literally any help with be much appreciated
 

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Clearly the BMW garage are useless. Rather then finding the fault they threw parts at it. It needs to be connected to an oscilloscope to see when the injectors are actually firing and the duration of each injection. There is something electrical not doing it's job correctly and I'm thinking you need ether and Indy or a auto electrical engineer to give it a look over and tell you why it's not performing as it should. Which is what BMW should have been doing.
They need to check that electrically the distributor, plugs, coils and ECU are communicating with each other and if not then which one isn't. To do this you will need an oscilloscope and known values.
 

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Discussion Starter · #11 ·
Tcon your a legend for all this advice mate. It definitely needs someone like that to thoroughly check and see what's going on. Clearly it's not a quick part swap like an Injector.

The worrying thing I've seen today while having a quick look was the smoke coming from the oil cap ! The engine was only on for 1 or 2 mins and I could gasses coming out. I could hear the pressure while unscrewing so quick shut the car off and opened it.

I'll try upload a video.

Again thank you mate

 

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I am guessing the smoke could be leaked fuel into the oil from an injector or possibly unburnt in the cylinder. Have you checked the oil level? Does the dipstick smell of fuel? Was there a strong smell of fuel while cranking and after?
It's harder to say seen as BMW have clearly not done a good job and now there is doubt about the quality of the work they did on top of the original problem.
If you can get a refund for the money wasted at the dealership this would easily cover a professional auto electrician to scan it and give you a real diagnosis of what is actually happening and then you can fix the real issues.
 

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Discussion Starter · #13 ·
Could very be unburt fuel that does make sense. The oil level annoyingly is digital so no dipstick but the computer reads good and at the correct levels. Very unlikely I'll get a refund but currently doing a lengthy email to customer care team. The actual garage is no hope at all.
I've been trying to research as much as possible as I'm already £1200 down with rentals and parts and still at square one.

What about the PCV valve/Crank casevalve ?

Font T-shirt Screenshot Event Advertising
 

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Looks ok to me, once there is no rips or anything. There is also no sludge inside which is good. They are very cheap to replace (I did mine two weeks ago) if you do want to rule it out. Check the pipes that feed to that too. They are known for cracking.
 

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Discussion Starter · #16 ·
That's good to know then, I did buy a new one to clean it up just incase.

New update:
Car recovered to a BMW & Mini specialist called D&T Wise. Very helpful techs and trustworthy.
Car has been with them several hours and they have literally been stumped by it aswell, done their checks sparks, coils etc as expected no change.

So next plan of action ECU ! At first I was confused why this would be the case but there's a very very high chance it's been short circuited thus causing the injector issue (Injector changed around so definitely not that)
I'll be having the car recovered back again 😞 but I'm now in contact with the attached. All sounds very hopeful.

I'll report back 👍
 

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Discussion Starter · #17 ·
So guys im stuck, Had no car for 7 weeks now !

Update -
Had the ECU repaired and received it back today.
The car has been left with the batteries disconnected for about a week, refit ECU, connected batteries.

Fingers Crossed

Car starts ! Does struggle at first i had nearly every single error message possible, drivetrain, stop start, you name it it popped up. so its running it doesnt seem like its juddering no more but ive gone to just give it a little rev and the car drops revs and almost wants to die. I turned it off and done the same doesn't rev above 1K. Turned it off.
Since then the car will not start whatsoever. Ignition turns on fine no issues all lights working, but go start start it the P flashes and the car does nothing. You can hear it wants to, doesnt crank but some engine components click but thats it.

Charged it up (mechanic said i needed a 14V charger) but again absolutely nothing.

Im so lost. All i can think its the battery is dud but nothing flashes on dash like a typical dead battery ( previous fault findings since ive had the car Auxiliary battery aged) or the ECU hasnt been fixed properly or Fuse ?

Guys please any help would be much appreciated.


Guys
 

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Having had a quick scan of the thread I can only think whoever done ECU repair has somehow caused the issues you are now getting as these were not there before. It all seems to be can bus related to me causing all the electronic gremlins
 

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Discussion Starter · #20 ·
Having had a quick scan of the thread I can only think whoever done ECU repair has somehow caused the issues you are now getting as these were not there before. It all seems to be can bus related to me causing all the electronic gremlins
Thank you for replying mate.

I've contacted the ECU company to explain as another mechanic I've spoken to has said it seems like they havent reprogrammed the ECU to the car correctly. This mad alot of sense as the amount of faults present and the car not starting.

Can bus related is this because of the ECU meaning another fault potentially or its the ECU that would need looking into again.

Cheers
 
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