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The dreaded swirl flaps

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26K views 31 replies 8 participants last post by  Electriceel  
#1 ·
Hi everyone. New to forum. Need some advice if possible. Probably answered a million times but I can't seem to find my issue. Driving home from work a few weeks ago I had a loss of power when putting my foot down on the slip road. Fault code indicated it was the swirl flaps so I had it in the garage and the mechanic recommended having them completely removed and a blanking plug fitted. So this was done. He also said I would then need the car remapping and to ask the tuner to map out the swirl flaps/swirl flap motor as well. Having used superchips to remap previous cars I went to them. Although not done on a rolling road the remap was done. But since having the flaps removed the car doesn't "wake up" until I get to the 3000rpm mark. With or without the map. When the map was on there it definitely went mental and was noticeably quicker but again only after 3000rpm. Superchips said they can't map out of the swirl flap motor and so it was taken back to standard and tomorrow I'm having the remap done on a rolling road. Just wondering if anybody has ever heard of this. I've got a 2016 f30 335d xdrive. Thanks 👍🏻
 
#2 ·
You don’t need to map them out,fit blank plug and leave motor in place electrically connected.
a decent mapper wouldn’t put a map on until problem is resolved, if it is happening with or without the map it suggests another issue. I would be suspecting egr sticking or problem with small turbo if it’s gutless up to 3000rpm.
Are turbos on them electronic or vac controlled?
 
#3 ·
Cheers for that. Not too sure if it's electronic or vac controlled. I was told until the swirl flaps are mapped out It will go into limp mode. Not producing much at all. When it was mapped it was fine after 3000rpm and as you say it points to something else. I'll find out I'm sure tomorrow if they can't suss it out on a rolling road
 
#18 ·
So. Still no closer to finding out this boost issue. Changing the boost pressure control valve tomorrow to see if that's the issue. Smoke test on the lines showed no signs of a leak. Sadly everything at the minute is pointing towards a new turbo charger which given the car has only done 55k is a bit crap 😭
 
#24 ·
I went to 117speed in Trafford Park. Turns out the rolling road/map is nothing to do with the boost issue I'm having pre 3000rpm. I need to have the issue sorted before having the car remapped and as was previously said the tuner won't touch it until the issue is sorted. They mapped out the egr and swirl flaps and the issue was still there. I then went looking for a leak in the system somewhere and had a smoke test done but this didn't find any leak. I've changed the map sensor which was filthy but the issue is still there. Next thing is the boost pressure valve in the morning to see if that helps. It's an electronic actuator on them so I'm stuck for getting that tested. Seems I will have to get a new turbo
 
#25 ·
The fault code you have relates to the swirl flap actuator motor going beyond its set parameters. When you turn the ignition on it does a sweep from open to closed as a swirl flap check. If it goes further than it should as a result of wear in the linkages it thinks the swirl flaps are broken and places the car in limp mode. It does not through a engine management light when it does this. Even though your swirl flaps have been removed the actuator will still does the sweep and in your case it is still going past it’s set parameters. You need to remove the actuator and fabricate a new stop so when t does the test sweep it stays within its settings.
the alternative is to replace e the inlet manifold with a new one which will also resolve the issue.
cheers
Jim