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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Low power always, and intermittent extremely slow acceleration issues. 2011 X5d M57Y



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      05-04-2022, 02:18 PM   #1
Sunnee
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Low power always, and intermittent extremely slow acceleration issues. 2011 X5d M57Y

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Last edited by Sunnee; 05-19-2022 at 08:50 PM..
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      05-04-2022, 05:33 PM   #2
lnxguy
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lol, fix your boost code (vac lines, pressure convertors etc) and I'll almost guarantee you the problems go away.
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      05-04-2022, 08:10 PM   #3
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If the e70 is like the e90 check the butterfly valve in the intake I had some loss of power and found that the valve was stuck.
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      05-05-2022, 06:16 PM   #4
BB_cuda
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Quote:
Originally Posted by Sunnee View Post
That's the plan, just wondering what are the chances of turbo being bad and if my problems and intermittent worse problem guide you in any certain direction of focus such as vacuum or turbo or wastegate etc.
Do the cheap things Inxguy suggests first before worrying of replacing the turbos. Vacuum lines before anything else. There is an excellent 14 step video Tunemyeuro put out on youtube. This gave me perfect directions for changing the vacuum lines. It delves into pressure converters too so if you need to change one of those, he shows how to get to them. Hold off of converters until you do the lines is my advice.
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      05-12-2022, 01:38 PM   #5
fearitself165
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Quote:
Originally Posted by Sunnee View Post
So took it to dealer and another mechanic after. Dealer said the ECM is modified by previous owner, catalytic converter is missing from the car and DPF is clogged. They won't do any more work on modified car. I asked them to check vacuum lines and pressure converters they said they are ok.

My mechanic got it next day, said ECR was unplugged so plugged in and drove around. Eventually the car shot out a big black smoke and started running much better after with more power. Vacuum and turbos are good they said but there is still limp mode errors popping up when pushed harder.

They suggested modified ECM, EGR valve, and missing cat could be the issue. We'll look more into those. Any other suggestions at this point would be appreciated.
I'm hoping the dealer didn't say that because if so it sounds like they're talking out of their ass. As far as I know the DOC (diesel oxidation catalyst) is part of the DPF... so how could the DPF be clogged.. u would think the DPF would be removed as well unless they literally cut it open and gutted the DOC only which would be weird. I would think they would gut the whole thing.

It sounds like you just need to get flashed back to stock and I'm pretty sure a few companies will do that. I doubt any parts were removed unless they were referring to the SCR system maybe?
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      05-12-2022, 05:20 PM   #6
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I wouldn't trust anyone that's looked at this car to be honest. Go see Andrew at TuneMyEuro and get a proper once over done.
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