XSeries-forum

[quote="rali"]
My car has also had a new turbo fitted a few months ago by previous owner. I do hope its a case of just replacing the MAF and not a decoke 
[/quote]


Have you got a receipt for the turbo?
If so check it had the turbo feed pipe replaced at the same time, apparently a lot of dealers failed to change that and the turbo failed again.

[quote="jagr"]
[quote="rali"]
My car has also had a new turbo fitted a few months ago by previous owner. I do hope its a case of just replacing the MAF and not a decoke 
[/quote]


Have you got a receipt for the turbo?
If so check it had the turbo feed pipe replaced at the same time, apparently a lot of dealers failed to change that and the turbo failed again.
[/quote]

Unfortunately no receipt.

Do you know if the swirl flaps have been removed?

I don't think they have, but not entirely sure to be honest.

Quick update, so I was going to order a new BOSCH MAF sensor today, but thought I'd ask my BMW Indi for his opinion first before I did. Having spoken to him it turns out he already tried a new genuine BOSCH MAF on the car during his initial diagnosis which he returned back to motor factors as it made no difference to performance!

It's strange how the cars runs like new with the MAF disconnected though? But no power at up to and around 2500rpm intermittently with it connected. If the car is stationary in neutral and you floor the accelerator pedal, the revs rise to 2500rpm where they will sit at for 5-6seconds then revs up past that again after the delay. Does this sound like coked up engine to you guys?

Could be a split or leaking intake goes or inlet manifold, as this would draw air in after the MAF, so confusing it.
You can spray easy start on the hoses and joints to see if the revs go up if it draws air in anywhere.
Just a thought

[quote="Horizon"]
Could be a split or leaking intake goes or inlet manifold, as this would draw air in after the MAF, so confusing it.
You can spray easy start on the hoses and joints to see if the revs go up if it draws air in anywhere.
Just a thought
[/quote]

Thanks for the suggestion, where would the likely areas be for a leak? I will get some easy start first thing in the morning.

Will running the car with the MAF disconnected cause any problems whilst I try to get to the bottom of the fault?

Quick Update: Checked for leaks, no visible leaks found. Removed intake pipe and checked the rubber boot. All intact and seems good. Reconnected everything back up making sure everything secure. Same as before, MAF connected, wont rev over 2000-2500rpm, MAF disconnected runs fine. Stumped. Where to from here?

Hi,

Did you ever get to a solution on this. I have the same issues. Running DIS V57, just get 3FFO. I've stripped the manifold, EGR, Swirls, new MAF (bosch) reset adaptations etc. Cleaned everything out. Engine flush, new oil, filters etc etc. Still a pain in the arse with the EML on every now and then. Hesitation at 2200rpm when stationary, though less sluggish when driving. Rev it when stationary, damn pain. Pull off the MAF connector, runs like its new. Interestingly, when the fault is registered, it says 'fault currently not present'.

Would appreciate any feedback as I'm a complete control freak and refuse to be beaten.

Chris

Hi,

Did you ever resolve this problem?

Thx
Sharief

[quote="rali"]
Hi guys,

Having problem with my 2006 BMW X3 2.0D (82K miles). The car hesitates and lack power around 2000rpm.

Took to local BMW specialist who said car threw fault code 003FFO (MAF sensor), caused engine management light to come on. After further diagnostics he said it seems it was a faulty MAP (manifold absolute pressure sensor) sensor as the pressure being read by it was not what it should be. Changed MAP but still no power, in fact the car performed was worse than before! Lumpy idle and wouldn't rev past 1500- 2000 rpm. He then said it is most likely carbon build up as these cars suffer from build up badly and inlet ports get restricted. He suggested taking apart inlet manifold and head and cleaning manually as solution, but thats a a days worth of work. Said he's had a few X3's with same issue before. However when the MAF sensor is disconnected the car runs 100% full of power and runs smooth as it should.

I decided to have the engine hydrogen carbon cleaned today, some power has been restored but still a hesitation.

I'm now left thinking could this be a MAF issue after all, the car had a genuine Bosch MAF sensor fitted. If the engine was blocked with carbon would it run mint with the MAF disconnected? Don't want to spend £300 on new genuine Bosch  MAF sensor to find its not the problem.

Your help is much needed! All thoughts would be appreciated. Thanks
[/quote]

I had same exact issue and unplugged the MAF sensor to receive linear power again, although at a little bit hotter engine and about 10% hit to fuel economy. Bottom line, it was my diesel particular filter creating back pressure. I deduced this since the bloke who owned it prior to me lived in the city and let his wife drive it often, and we know how they drive stick by never downshifting. Nonetheless, after 2 years of being lied to by BMW mechanics about needing to decoke the engine etc. which made zero sense and other stupefied mechanics, I told the one I trust who thinks out of the box to conduct a pressure check on each cylinder and to look at the aft diesel particle filter and sure enough, that was the issue. He had it cut open and burned out and fixed by another guy for about 250 Euro. The back pressure prior was 35mbar and after cleaning 8mbar. Also, 125g of carbon/clog/soot was taken out. Funny thing, I see no posts about the particulate filter being a solution. So, unless the mechanic was misleading me, who knows. But it sounds logical. Good luck!