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01-22-2018, 04:15 PM | #1 | |
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2DD6 Valvetronic & running mods
I've a 2011 135i DCT N55 with 57k miles. My car has been throwing 2DD6 for a while:
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Is it okay to let the car run as is? I don't really have any problems other than minor occasional rough idle ~(600-650 rpm) Is it okay to flash and run car with MHD? Or should I get this fixed before trying any mods? p.s. I've new spark plugs/coils, intake and exhaust manifolds are cleaned. No problems with WOT running stock.
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01-22-2018, 04:18 PM | #2 |
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Advice that should apply to any car: Take care of maintenance and other issues before doing any mods.
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser |
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01-22-2018, 06:20 PM | #3 |
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I'm not throwing codes or CEL but I have the rough idle and cold start. I already replaced the VVT motor but I installed it wrong and I think fried the new part. I'm saving for it again but this time taking it to my indie mechanic because it took me 9 hrs the first time and messed it up. Lesson learned but it's ok to drive with the VVT not working (the vanos and such still works as intended but you lose the fuel eco and a slight delay in reaction time when throttle is pushed). But do replace the items needed before modding.
Might want to do a valve cover gasket and VVT gasket. There could be other parts that need replacing but those are the basics. |
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01-23-2018, 06:47 PM | #4 | |
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Out of curiosity, at how many miles did your's fail?
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01-23-2018, 07:06 PM | #5 |
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I'm close to 94k kms but around 90k kms. It seems to be a common issue with the VVT motor going out. Not sure why but a few people have been having this issue. Works great when warm but cold start and idle can be choppy till things heat up.
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01-24-2018, 08:09 AM | #6 | |
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Otherwise, there does not seem to be any ill effects of running without the eccentric shaft senor. All the eccentric shaft sensor does is provide feedback of actual valve angle the ensure proper actuation is being achieved by the valvetronic motor. Without valvetronic operating, the DME fail-safes to controlling airflow with the throttle plate like an N54 does. Last edited by bbnks2; 01-30-2018 at 08:30 AM.. |
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01-29-2018, 04:46 PM | #7 | |
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01-30-2018, 08:29 AM | #9 | |
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https://www.newtis.info/tisv2/a/en/f...-gear/CyzwchK9 If you take the valve cover off you might as well just replace the valvetronic motor... |
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02-02-2018, 03:57 AM | #10 | |
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02-02-2018, 07:21 AM | #11 | |
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Also, he is part right. The instructions are in my post above... TIS is the guide BMW techs use to do the job. The only technical part about it is to perform the "run-in" procedure which is done with ISTA. I am not sure how necessary that is though since the DME will try to re-learn the stop limits upon startup? |
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02-03-2018, 12:19 PM | #12 |
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I just bought a new VVT motor for less then $500 CAD from BMW today while I got my oil change. If you search the forum or click my name and look at the post I made, I took pictures of myself doing the job from start to finish. I would recommend sourcing the parts yourself to save some money but get a tech/mechanic to install it. I messed up when I put the shaft 180 degrees backwards when I put everything back together.
Quick search : http://www.1addicts.com/forums/showthread.php?t=1435087 Link to my post about installing the eccentric shaft. Just so you know, that was a 9 hour job with my father who builds engines. Our current project is putting a 6/71 Weilands supercharger on his 496 stroker big block. Should push around 1300hp afterwards. So this isn't a task for the mechanically handicapped. |
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02-04-2018, 09:31 PM | #13 | |
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Did you get it fixed now? how bad was your rough idle before and after?
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02-05-2018, 05:58 PM | #14 |
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I haven't gotten it fixed yet, just sourced the part. The rough idle is always the same, just a bad "hickup" once the rpms start to settle around the 800 range, then it jumps and starts to settle again. Only on cold start. The idle at a red light when warmed up you can feel the slight hickup but the rpms always show 650ish.
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02-05-2018, 06:29 PM | #15 | |
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Additionally, throttle lag in D mode. Or is D mode designed to be laggy? (Sport mode is fine).
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02-12-2018, 04:52 PM | #16 |
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D is slight delay in gear shifts (the pressure plate doesn't engage rapid like sport mode does). It also adjust the throttle position a bit and raises the rpms slightly for the more sporty feel.
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