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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 > 335d suddenly no boost from either turbo



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      04-18-2022, 07:14 AM   #1
swappyd
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335d suddenly no boost from either turbo

Driving my 335d just steady when I stopped at some lights and started to go no boost at all nothing from either one! The brakes work ok so not the vacuum pump.

Took it to a friendly BMW specialist and he plugged it in but no comms with the DDE!

Could a faulty DDE be the cause of the boost issue? Any ideas what I need check as it was running perfectly before and then like a switch nothing!
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      04-18-2022, 11:48 AM   #2
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If you get no comms from the DDE the car won't even start. You sure this guy knows what he's doing?
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      04-18-2022, 01:33 PM   #3
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Quote:
Originally Posted by swappyd View Post
Driving my 335d just steady when I stopped at some lights and started to go no boost at all nothing from either one! The brakes work ok so not the vacuum pump.

Took it to a friendly BMW specialist and he plugged it in but no comms with the DDE!

Could a faulty DDE be the cause of the boost issue? Any ideas what I need check as it was running perfectly before and then like a switch nothing!
Maybe give us some background on your recent routine maintenance. Vacuum lines done? I don't want to jump to conclusions and say pressure converters as you should have gotten a code if one of those (for instance 4530).

Getting lots of smoke now?
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      04-18-2022, 02:09 PM   #4
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Im guessing sticking waste gate actuator.....ill bet it fixes itself with a restart.
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      04-18-2022, 02:36 PM   #5
swappyd
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The no comms was that the diagnostic test kit wouldn't talk to the module.
It has in the past.

It has been driven a few times and not fixed it self.

It has been off the road now a couple of months due to lack of time to be able to look at it with work life etc…

Now mot and tax has expired so can't do any road testing!!

I'll going to look at it tomorrow so will check the hoses. As both don't boost guessing that looking at the hoses that are common to both would be my first point of call?

On a side note what is the best Bluetooth obd reader and software for the iPhone for BM's?
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      04-18-2022, 02:42 PM   #6
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Quote:
Originally Posted by swappyd View Post
The no comms was that the diagnostic test kit wouldn't talk to the module.
It has in the past. It has been driven a few times and not fixed it self.
So the DDE is not your problem. Vac lines been replaced? Both pressure convertors? EV valve that controls the compressor bypass? building vacuum at idle?
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      04-18-2022, 02:44 PM   #7
swappyd
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Ok I'll do some checks thank goodness it isn't the DDE!!!!!!!

I'll let you know what I find
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      04-19-2022, 02:51 AM   #8
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Where is the ev valve located?
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      04-19-2022, 09:07 AM   #9
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^^^Its the little valve under the vac assembly close to firewall.
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      04-19-2022, 03:06 PM   #10
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Yup, right underneath the far back pressure convertor.
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      05-07-2022, 05:02 AM   #11
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Ok two lines look very dodgy! Trying to get the bracket for the pressure converters off found 4 fixings 3 at the top and 1 underneath at the front but feels like there's a fifth but can't feel it any pointers to the location?
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      05-08-2022, 10:08 AM   #12
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there are 5....3 along top 2 under.....1 is visible up front....the other is quite hidden and a PITA to get to in the rear....I left that 1 off lol
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      05-08-2022, 12:07 PM   #13
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Just remove the bracket and the EV valve is staring you right in the face. If you're going in there replace everything.
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      05-29-2022, 12:05 AM   #14
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If you're still troubleshooting this and looking at vacuum, here are the video's.

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      05-30-2022, 11:14 AM   #15
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Project Seven videos should be a viewing requirement before making a thread.
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