429A low pressure underboost; many new parts I'm at a loss. HELP!

madbim · 07-23-2019, 09:29 AM

Posting here for additional viability
This is cross posted on NA BMW Diesel Owners

429A low pressure underboost; many new parts I'm at a loss. HELP!

I've been chasing this issue on my 2013 35d for a while now, and cannot seem to figure it out. Currently have 107k miles, new water pump, thermostat, glow plugs, glow plug controller, vacuum res, vacuum controller, pressure converters and vacuum lines, boost hose seals, cleaned MAF.

Boost seems low across entire range (although not sure what should be expected?)
DDUMD Stage 1 tune sll stock hardware less EGR delete
Trans tune from Rod
429A came back on my test run tonight, it sometimes feels laggy between 3000-3700RPM. Also for the first time I noticed 452A which appears to be a DPF related code.

UPDATES

7/21 - wifi endoscope ordered
7/22 - New MAP sensor ordered
7/22 - Log https://datazap.me/u/madbim/35d-7-22...zQ5SReAOw42URc
7/23 - Visually inspected valve cover gasket, no issues to note
7/25 - MAP Sensor replaced, error still occurring
7/25 - Latest Logs -> https://datazap.me/u/madbim/35d-7-25...1-3-4-10-11-15

Any help\guidance is appreciated.

335dlci · 07-23-2019, 01:05 PM

Turbo? Exhaust leak?

madbim · 07-23-2019, 01:06 PM

Quote:

Originally Posted by 335dlci

Turbo? Exhaust leak?

I haven't been able to find any exhaust, turbo or boost leaks.

335dlci · 07-23-2019, 01:14 PM

Have you pressure smoke tested the charge side?

335dlci · 07-23-2019, 01:15 PM

People always look over the VCG a lot.

rkstar9 · 07-23-2019, 03:26 PM

what egr delete kit did you use? it could be leaking at the exhaust manifold.
Your dpf could be clogged as well. Also could be an issue with vacuum lines/reservoir.

Reservoir is pretty easy to test.

madbim · 07-23-2019, 04:58 PM

Quote:

Originally Posted by 335dlci

People always look over the VCG a lot.

Haven't considered the VCG as a potential issue yet. Car isn't smoking, anything else I can do to rule it out?

madbim · 07-23-2019, 05:00 PM

Quote:

Originally Posted by rkstar9

what egr delete kit did you use? it could be leaking at the exhaust manifold.
Your dpf could be clogged as well. Also could be an issue with vacuum lines/reservoir.

Reservoir is pretty easy to test.

I used the bimmertune delete kit, I looked at it and couldn't see any signs of leaking.

Vacuum lines, pressure converters and res have all been replaced.

Considering the dpf, not sure how to confirm this yet?

335dlci · 07-23-2019, 05:01 PM

Quote:

Originally Posted by madbim

Haven't considered the VCG as a potential issue yet. Car isn't smoking, anything else I can do to rule it out?

It probably wont smoke since you have a dpf...

madbim · 07-23-2019, 05:48 PM

Quote:

Originally Posted by 335dlci

It probably wont smoke since you have a dpf...

Ahh good call; I'll look to see if I can find any oil seepage around the valve cover.

335dlci · 07-23-2019, 05:50 PM

Quote:

Originally Posted by madbim

Ahh good call; I'll look to see if I can find any oil seepage around the valve cover.

This is not normally where it leaks. You cant see a boost leak from the outside of the valve cover

007_e350 · 07-24-2019, 02:34 PM

I don’t know the m57 too well but on the n54 I plugged my air compressor into the diverted valve and compressed the whole system, then listen for hissing sounds ...

Turned out it was the diverted valve itself leaking

Haha, now I have forge DVs that can handle high boost, anyway back to m57 I’m not sure if they have those or not... also Intercooler connection was leaking boost at some point too I had to reseat it

madbim · 07-25-2019, 10:50 PM

Map sensor was replaced tonight, as anticipated no change still the same error.

Yozh · 07-27-2019, 11:20 PM

You guys have a similar issue. You should be comparing data

madbim · 07-28-2019, 04:27 PM

Quote:

Originally Posted by Yozh

You guys have a similar issue. You should be comparing data

Who has a similar issue? Yozh any help you could provide would be much appreciated! I'm running short on what to try next.

Yozh · 07-28-2019, 11:16 PM

Madbim we had a good discussion over on FB. I think Dima has a great suggestion to check that your SCR is not clogged. Remove the metering valve and see what happens to the exhaust pressure. Also, please confirm that regenerations happen.

madbim · 08-04-2019, 06:27 PM

Quote:

Originally Posted by Yozh

Madbim we had a good discussion over on FB. I think Dima has a great suggestion to check that your SCR is not clogged. Remove the metering valve and see what happens to the exhaust pressure. Also, please confirm that regenerations happen.

Yozh I did test both engine mounts and they hold vacuum, with the engine idling and a vac gauge on the line that feeds the mount it bounced rapidly between 0-1 hg is that to be expected? Do you know if there is a test for this pressure converter in ISTA?

Yozh · 08-05-2019, 12:57 PM

1Hg or 25-27Hg which is a full vac it should see on activation.

rndmguy06 · 08-17-2020, 03:50 PM

bump.

Any Update? Did you figure it out?

madbim · 08-24-2020, 09:58 PM

Clogged DPF. I ended up doing a delete which solved my issue.

rndmguy06 · 08-24-2020, 11:44 PM

Quote:

Originally Posted by madbim

Clogged DPF. I ended up doing a delete which solved my issue.

Thanks for the update. I received the same error in a pull from a standstill in 3rd. Twice. Someone told me it could be a vacuum leak. Since I want to keep my alphabet and run meth, I am pulling my intake and running new lines next week.

Glad you figured yours out!

335dlci · 08-25-2020, 11:53 AM

I have this fault aftee deletes... deletes may not fix it.

07-23-2019, 09:29 AM	#1
madbim Private First Class 32 Rep 160 Posts Drives: 08' E90 335xi Join Date: May 2011 Location: Madison, WI iTrader: (0)	429A low pressure underboost; many new parts I'm at a loss. HELP! Posting here for additional viability This is cross posted on NA BMW Diesel Owners 429A low pressure underboost; many new parts I'm at a loss. HELP! I've been chasing this issue on my 2013 35d for a while now, and cannot seem to figure it out. Currently have 107k miles, new water pump, thermostat, glow plugs, glow plug controller, vacuum res, vacuum controller, pressure converters and vacuum lines, boost hose seals, cleaned MAF. Boost seems low across entire range (although not sure what should be expected?) DDUMD Stage 1 tune sll stock hardware less EGR delete Trans tune from Rod 429A came back on my test run tonight, it sometimes feels laggy between 3000-3700RPM. Also for the first time I noticed 452A which appears to be a DPF related code. UPDATES 7/21 - wifi endoscope ordered 7/22 - New MAP sensor ordered 7/22 - Log https://datazap.me/u/madbim/35d-7-22...zQ5SReAOw42URc 7/23 - Visually inspected valve cover gasket, no issues to note 7/25 - MAP Sensor replaced, error still occurring 7/25 - Latest Logs -> https://datazap.me/u/madbim/35d-7-25...1-3-4-10-11-15 Any help\guidance is appreciated. __________________ 2008 E90 335xi - DPs, 5" IC, MHD Stg2+, xHP Stg3, xDelete \| 2013 X5 35d - DUDMD Stg1, EGR Delete Last edited by madbim; 07-25-2019 at 10:50 PM..
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07-23-2019, 01:05 PM	#2
335dlci Lieutenant Colonel 277 Rep 1,576 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	Turbo? Exhaust leak?
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07-23-2019, 01:14 PM	#4
335dlci Lieutenant Colonel 277 Rep 1,576 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	Have you pressure smoke tested the charge side?
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07-23-2019, 01:15 PM	#5
335dlci Lieutenant Colonel 277 Rep 1,576 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	People always look over the VCG a lot.
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07-23-2019, 03:26 PM	#6
rkstar9 First Lieutenant 75 Rep 392 Posts Drives: '10 X5 3.5D Join Date: Sep 2010 Location: Chicago iTrader: (2)	what egr delete kit did you use? it could be leaking at the exhaust manifold. Your dpf could be clogged as well. Also could be an issue with vacuum lines/reservoir. Reservoir is pretty easy to test. __________________ 535D Xdrive DUDMD Stage 1 x5d e70 DUDMD stage 2 tune
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07-24-2019, 02:34 PM	#12
007_e350 Lieutenant Colonel 217 Rep 1,909 Posts Drives: 335i 2008 MHD'd / x5d E70 Join Date: May 2013 Location: left lane iTrader: (3)	I don’t know the m57 too well but on the n54 I plugged my air compressor into the diverted valve and compressed the whole system, then listen for hissing sounds ... Turned out it was the diverted valve itself leaking Haha, now I have forge DVs that can handle high boost, anyway back to m57 I’m not sure if they have those or not... also Intercooler connection was leaking boost at some point too I had to reseat it Last edited by 007_e350; 07-24-2019 at 02:40 PM..
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07-25-2019, 10:50 PM	#13
madbim Private First Class 32 Rep 160 Posts Drives: 08' E90 335xi Join Date: May 2011 Location: Madison, WI iTrader: (0)	Map sensor was replaced tonight, as anticipated no change still the same error. __________________ 2008 E90 335xi - DPs, 5" IC, MHD Stg2+, xHP Stg3, xDelete \| 2013 X5 35d - DUDMD Stg1, EGR Delete
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07-27-2019, 11:20 PM	#14
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	You guys have a similar issue. You should be comparing data
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07-28-2019, 11:16 PM	#16
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	Madbim we had a good discussion over on FB. I think Dima has a great suggestion to check that your SCR is not clogged. Remove the metering valve and see what happens to the exhaust pressure. Also, please confirm that regenerations happen.
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08-05-2019, 12:57 PM	#18
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	1Hg or 25-27Hg which is a full vac it should see on activation.
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08-17-2020, 03:50 PM	#19
rndmguy06 New Member 3 Rep 26 Posts Drives: 2011 335d Join Date: Jul 2020 Location: Northern Utah iTrader: (0)	bump. Any Update? Did you figure it out?
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08-24-2020, 09:58 PM	#20
madbim Private First Class 32 Rep 160 Posts Drives: 08' E90 335xi Join Date: May 2011 Location: Madison, WI iTrader: (0)	Clogged DPF. I ended up doing a delete which solved my issue.
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08-25-2020, 11:53 AM	#22
335dlci Lieutenant Colonel 277 Rep 1,576 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	I have this fault aftee deletes... deletes may not fix it.
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