Help...little turbo not boosting...

335inDe · 07-10-2017, 04:12 PM

I have been chasing a problem with little to no low boost for a while in my down time..I have narrowed it down to the electronic valve that controls the front turbo is not working. I swapped it with the one from the EGR cooler since that isn't needed anymore and still nothing..After tons of tests and replacing all vac lines I finally got a meter out and found the power connector for that valve is only putting out .88 volts..so I tested the power for the EGR one it's 13.xx I have no clue if this is normal or not but it's the only lead I have. The plug connects directly to the DME so I'm wondering if there is a relay/fuse or if it's possible to have a bad mosfet or something in the DME.. Any help is appreciated.

Thx!

Yozh · 07-10-2017, 11:09 PM

Here is something that should help you a little:
http://www.e90post.com/forums/showthread.php?t=1308500

The little electric switchover valve that you are testing the voltage on should be as you have described. If this is the same as EGR cooler bypass one then there are ways to test it as described in the above link. It should be off at idle and only come on after 2800-3000 rpm and certain boost.

Yozh · 07-10-2017, 11:16 PM

You may also want to watch this:

335inDe · 07-11-2017, 07:48 AM

Quote:

Originally Posted by Yozh

Here is something that should help you a little:
http://www.e90post.com/forums/showthread.php?t=1308500

The little electric switchover valve that you are testing the voltage on should be as you have described. If this is the same as EGR cooler bypass one then there are ways to test it as described in the above link. It should be off at idle and only come on after 2800-3000 rpm and certain boost.

Thank for that information! I definitely believe you are correct. After reading this I swapped pressure converters and it definitely brought the little turbo back. I ordered a new pair hopefully that will be the end of it!

JOHNNYBRAVO1 · 07-11-2017, 10:29 AM

Very well could also be injectors.. I had similar that Yozh and many more helped me out with. My rear 3 injectors with 85,000 before cbu cleaning where so gunked up with carbon. Once replaced my low end power came back. All my converters, vac lines, actuators were all replaced right before I did my injectors. At the time I did replace all 6 injectors after I did the PITA CBU. Hopefully it's just the preasure converter, but keep in mind those back injectors get bad and my back 2 also had rust

bayerischer · 07-20-2017, 02:06 PM

i want to replace pressure converters and also consider egr converter. anyone knows how long it takes? in hours

Yozh · 07-20-2017, 04:49 PM

Depends how good are you. Replace all the vacuum lines at the same time. At least a few hours if you know what you are doing.

07-10-2017, 04:12 PM	#1
335inDe Private First Class 38 Rep 144 Posts Drives: 07' 335i Join Date: Jun 2012 Location: Delaware iTrader: (1)	Help...little turbo not boosting... I have been chasing a problem with little to no low boost for a while in my down time..I have narrowed it down to the electronic valve that controls the front turbo is not working. I swapped it with the one from the EGR cooler since that isn't needed anymore and still nothing..After tons of tests and replacing all vac lines I finally got a meter out and found the power connector for that valve is only putting out .88 volts..so I tested the power for the EGR one it's 13.xx I have no clue if this is normal or not but it's the only lead I have. The plug connects directly to the DME so I'm wondering if there is a relay/fuse or if it's possible to have a bad mosfet or something in the DME.. Any help is appreciated. Thx!
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07-10-2017, 11:09 PM	#2
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	Here is something that should help you a little: http://www.e90post.com/forums/showthread.php?t=1308500 The little electric switchover valve that you are testing the voltage on should be as you have described. If this is the same as EGR cooler bypass one then there are ways to test it as described in the above link. It should be off at idle and only come on after 2800-3000 rpm and certain boost.
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07-10-2017, 11:16 PM	#3
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	You may also want to watch this:
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07-11-2017, 10:29 AM	#5
JOHNNYBRAVO1 NY BRAVEST 47 Rep 231 Posts Drives: 2010 Monaco blue, 335D Join Date: Mar 2016 Location: NEW YORK, LONG ISLAND iTrader: (0)	Very well could also be injectors.. I had similar that Yozh and many more helped me out with. My rear 3 injectors with 85,000 before cbu cleaning where so gunked up with carbon. Once replaced my low end power came back. All my converters, vac lines, actuators were all replaced right before I did my injectors. At the time I did replace all 6 injectors after I did the PITA CBU. Hopefully it's just the preasure converter, but keep in mind those back injectors get bad and my back 2 also had rust
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07-20-2017, 02:06 PM	#6
bayerischer Private 7 Rep 78 Posts Drives: 335d e92 Join Date: Aug 2016 Location: central europe iTrader: (0)	i want to replace pressure converters and also consider egr converter. anyone knows how long it takes? in hours
	Appreciate 0 Quote

07-20-2017, 04:49 PM	#7
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	Depends how good are you. Replace all the vacuum lines at the same time. At least a few hours if you know what you are doing.
	Appreciate 0 Quote