BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > 335d Swirl Flaps

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      01-02-2015, 03:02 PM   #45
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Angry 335d - 2009 - 52K miles

Was just told by my BMW dealer that I needed to replace the swirl flap actuator. $1,500 (parts $1,000 and $500 labor). Not happy!
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      12-17-2016, 07:28 PM   #46

Drives: 335d e92
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Originally Posted by jasonprice07 View Post
You have to weigh up the likely hood of the flaps falling into the engine against any potential damage caused by removing them. I have not read on any of the Forums that removing the flaps has any negative effects, and in the short term this is true. Although what no one knows or seems to care about and I include tunners, indies etc. is the long term potential damage to the DPF.
I'll explain, swirl flaps are fitted to create swirl in the combustion chamber swirl has a dramatic effect on reducing engine out soot or particulate matter or to most of us smoke. The very stuff the DPF stores and then burns off when it regenerates. So if you remove the swirl flaps the engine out levels off soot go up. Depending on the base engine and the calibration used, it can go up a lot. Remove the flaps and the DPF is suddenly getting filled every 100km instead of every 400km, so where BMW claim a DPF life of 100k miles, it has now decreased to 25K.
Plus frequent DPF regeneration increases fuel consumption and also the chance of fuel (used in post injections) entering the engine oil, leading to engine run-away and failure.
So before you whip out the flaps, just think about the above.

The only people who truely understand the use of swirl are the engineers who work for the vehicle manufacturer that is what I tell my boss when I need a pay rise

this is exactly true, no tuner, or indy mechanic will agree with. i had removed swirl flaps and after cuople of thousand miles on clock, my particulate filter is full. so my mechanic costed me like 1500 euro by his "help"
internet forums can help, but also spread false info.
if you have removed pdf then u can remove swirls, but if you like me don't wanna remove pdf and have black smoke like a fricking tractor, then keep your swirl flaps and just check them from time to time and don't trust these experts that are smarter than engineers who created engine and knew why they put it there
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      12-18-2016, 05:48 PM   #47
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Originally Posted by leeandzed View Post
Will try to cut a long story short.... Have a 2007, 335d M Sport touring. Recently had a brake fluid service at Sytner Chigwell plus their '2012 health check' offer for 20 pound 12 pence, they noticed an oil leak under the gearbox sump pan. They diagnosed this as a gearbox oil leak due to a warped pan and quoted me over 700 quid to replace the pan, refill the oil at 20 quid a litre (which apparently never needs to be replaced which i found out afterwards), cost to fit plus vat. I wanted a 2nd opinion so took it to a local Beemer indy specialist, put it up in the air and noticed straight away that it was an engine oil leak (black oil) and not gearbox oil (brown). Took them a few hours to find the leak as it was coming from the engine somewhere and running down onto the gearbox sump, hence it looked like a box issue. Eventually noticed oil coming out from the swirl flaps after having to remove the inlet manifold etc. Said it was a common fault and suggested to put blanking plates in place. Cleaned it all up, test drove a few miles and no more leaks. Cost me 280 quid. Would have been cheaper but it took them a while to find the cause of the leak, as the plates are only a tenner each and needed 6.

Never going to Sytner again and will certainly be sending them a sh1tty letter/email sometime very soon.

Recommend Highams Park Motor company in Chingford London E4, very good techs and seem very trustworthy.
I had the very same leak back in April, but as i had BMW Warranty, i got a new manifold fitted. So i'm not going to bother blanking them off.
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      02-05-2017, 11:12 AM   #48
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I have a 330d factory build Jan 2011. I've been advised to first try a 'carbon clean'. Anyone done that and found it worked?
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