M135i Misfire problems

[shunt]

Having a few issues with my 7500 mile M135i. It has developed a misfire, BMW tech guy located it to the car detecting a misfire on cylinders 3 & 4, it then shuts down the fuel injection and becomes much much worse.

It been in the dealers now for 2 weeks with no sign of them being able to fix it. They are in contact with PUMA Germany but as yet don't have a resolution. Surely they should be able to solve this in 2 weeks. Has anyone else had this issue and maybe shed some light on what might fix it. They've been through plugs, coil packs, HPFPS & compression tests.

I'm now at the point where I'd like to reject the car as a lemon, but they didn't appear to like that idea.

Help appreciated chaps.

[shunt]

Yeah, they've currently been through plugs, coil packs, injectors & compression checks. I'm not a happy owner.

[shunt]

Helicopter123 said:

Ok, so your car has developed a problem after 7500 trouble free miles. Your dealer is attempting to fix, and is seeking guidance from Germany. Have they given you a courtesy car meantime?

Seems a bit early to be calling it a lemon surely?

Yes they have given me a 40k mile 320d which is 4.5k miles overdue a service. I'm off on holiday next week driving through France to northern Spain. The whole idea of the holiday was to enjoy the M135i, hence this issue is beginning to grate on me. Hopefully they will fix it this week, but I'm not holding my breath. I've used this dealer in the past and don't have much faith, sadly it broke down locally and they were the nearest for recovery.

How long should you wait before it can become a lemon? 2 weeks and counting seems fair in my book. I'm paying for something I don't have and is not fit for purpose.

[shunt]

I've already tried that, they've nothing available. They have said they will swap the 320d but it's a rental so the replacement will be something similar. They also advised I should be thankful for having a car as they aren't obliged to give me anything!

[shunt]

Another week goes by and guess what, yes still not sorted. They advised me yesterday they had ordered a new ECU that would be arriving today. Just had a phone call to advise the ECU is on back order and will take 7 - 10 days to arrive.

Seriously unimpressed, I'm off to Spain tomorrow in the wife's Kia Sportage instead of my M135i. Somehow it won't be the same.

So BMW will have had my car for over a month to fix a misfiring issue. I've had loads of BMW's over the years including many M's. Something tells me this will be the last BMW I will ever purchase.

[shunt]

ManiacGT said:

I'd still consider another BMW but I'd not get a first model year and I'd also do a lot more research.

Mine isn't a first model year - 63 plate.

I also said it about Ford after suffering 6 months faults with a MkIII RS Turbo, I've never owned a Ford since.

[shunt]

I feel for you too, that's shocking.

Sadly it's not a lease but on a PCP with minimal deposit, I'd be quite happy to lose the deposit and just walk away from it.

[shunt]

Jimmsey, what was the problem with yours to replace the DME, same misfire?

[shunt]

Update, they think the new DME has fixed it. I can't collect it until next week so fingers crossed it has.

[shunt]

OK, it's back with me but is booked into their bodyshop to fix the gouges they've put in paint on the rear quarter. I despair.

[shunt]

I took it on a long run last night and yes the misfire appears to be cured. The paintwork damage is around an 8mm dia chip down to the primer just above the rear wheel arch, with some other scratches nearby. They agreed it was fresh damage and probably done whilst the car was with them.

They also found some minor scratching on the front bumper which had happened when something in the garage fell on it. I said I knew about those and they weren't their fault. As a 'goodwill gesture' they will resolve those whilst it's in the bodyshop.

It's a shame as I've had many BMW's over the years, I really like their cars, but the aftercare is frankly shocking. This will be the last BMW I own.

[shunt]

Jon, that sounds exactly like how mine started. Low throttle in auto between 1 - 1.5k slight stutter, then clears once over 1.5k revs. It gradually got worse until it shuts the injectors off on the problem cylinders.