Bmw 125d 2015 Facelift Swirl Flaps Problem

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Manufactured from end of 2011

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HamzahV
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Bmw 125d 2015 Facelift Swirl Flaps Problem

Post by HamzahV » Tue Sep 10, 2019 7:41 pm

Hi guys, i’m new to this forum and just needed some help regarding my 125d. Its the 2015 lci model so i’m guessing the newer b47 engine?

However the issue i’m running into is turbo underboost. At full throttle/flooring it, the car runs a dream but lower down there is little power and the drive train fault ends up coming up restricting performance.

Is there any fixes to this or anywhere I should look first? Any help would be greatly appreciated.

Thanks guys!

tonirai
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Re: Bmw 125d 2015 Facelift Swirl Flaps Problem

Post by tonirai » Tue Sep 10, 2019 9:32 pm

Are you sure about swirl flaps issue? Have you connected the car to diagnose the problem?
EGR fault can have those similar symptoms... And there are recalls for it, did yours have it done?

HamzahV
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Re: Bmw 125d 2015 Facelift Swirl Flaps Problem

Post by HamzahV » Wed Sep 11, 2019 8:45 pm

I checked the vin and theres no outstanding recalls on the car?
And the mechanic did say the swirl flaps were pretty covered in carbon so i’ve had a tuner delete the software so they dont work anymore or cause any problems. Seems to be a vacuum leak somewhere

Tiffster
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Re: Bmw 125d 2015 Facelift Swirl Flaps Problem

Post by Tiffster » Wed Sep 11, 2019 10:33 pm

The only way to check the swirl flaps for carbon build up is to completely remove the inlet manifold. Did your mechanic do this ? It's about 2-3 hours labour.

When the drive train fault appears, what fault codes are logged (presuming you have had it scanned)

The 125D is VERY common for the small turbo seizing, i've replaced loads due to it. Very little to zero low down power but mid and top end range is fine as the second larger turbo kicks in.

HamzahV
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Re: Bmw 125d 2015 Facelift Swirl Flaps Problem

Post by HamzahV » Thu Sep 12, 2019 12:03 pm

Its P0299 coming up. Apprently a vaccuum leak according to the remap specialist fixing the car

Tiffster
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Re: Bmw 125d 2015 Facelift Swirl Flaps Problem

Post by Tiffster » Thu Sep 12, 2019 10:07 pm

P0299 will most likely be the pressure converter for the small turbo, a vac hose (although unlikely on 2015) or the small turbo itself.

HamzahV
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Re: Bmw 125d 2015 Facelift Swirl Flaps Problem

Post by HamzahV » Fri Sep 13, 2019 8:31 am

Turned out it was a hose that was pinched, vacuum pressure back and cars back to its normal self! Thanks for the help

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