*SOLVED* I'm desperate; please help me. 2012 535i stalls when warm

HotSpicyChicken90 · 06-15-2020, 02:52 PM

Quote:

Originally Posted by mashpotato

You don't have any other codes besides fuel rich in ISTA-D?

Do you have any vacuum leaks(ex. Valve cover)? Are you holding boost (no leaks around charge pipe connections)?

There was someone here who had a bad new injector and screwed up the spark plug too. Would STFT show anything? (Dumping fuel when the car is warm, when cold everything evaporated?)

Didn't mix up the primary and secondary 02 sensor right?

Just throwing it out there

The o2 sensors can't be mixed, since they have different connectors and cable-length

haha well they can, for sure

but it's highly unlikely

Trainwreck914 · 06-15-2020, 09:43 PM

That's a lot of $ being thrown at it. Why wouldn't you just take it to shop/expert? Hopefully it comes down to your throttle body. But if not just throw in the towel and take it in. Definitely check your fuel pressure. It could very well be the hpfp

HotSpicyChicken90 · 06-16-2020, 05:03 PM

Yeah, that’s the last attempt i’m going to do.

So guys I'm getting closer to the root cause... ISTA managed to (finally) throw several codes on the TB! I've never been so happy to see a fault code

It said something like: Emergency-position and winding mechanism defect. Also there was a huge difference between live and fixed-values. Now it makes all sense: since the TB did not open properly, the engine did not get the required air-flow - hence SYSTEM TOO RICH

So it should be shipped tomorrow.

I will let you know.

Thanks for the support guys

HotSpicyChicken90 · 06-18-2020, 07:51 AM

Guys....

I did it!

The TB was somehow defective

Car now runs like it has been brought down by a divine unicorn

TZ · 06-18-2020, 08:58 PM

Congrats. It is fun following your troubleshooting process.

Trainwreck914 · 06-18-2020, 09:04 PM

Congrats man. Glad you figured it out. Even better you came back to report it!

mediocrechris · 06-26-2020, 09:28 AM

What is a TB?

Dan944 · 06-26-2020, 09:33 AM

Quote:

Originally Posted by mediocrechris

What is a TB?

Throttle Body

mediocrechris · 06-26-2020, 09:40 AM

Quote:

Originally Posted by Dan944

Throttle Body

Thank you

Ngwing125f10n20 · 08-07-2022, 12:27 AM

Quote:

Originally Posted by HotSpicyChicken90

Yes I did

Hi! I have same issue. What have you done to solve this problem. Thanks!

ceka · 08-07-2022, 02:35 AM

Quote:

Originally Posted by Ngwing125f10n20

Hi! I have same issue. What have you done to solve this problem. Thanks!

I believe he changed the throttle body.

Ngwing125f10n20 · 08-07-2022, 11:57 PM

Quote:

Originally Posted by ceka

Quote:

Originally Posted by Ngwing125f10n20

Hi! I have same issue. What have you done to solve this problem. Thanks!

I believe he changed the throttle body.

I have cleaned the TB too. The problem still here

Ngwing125f10n20 · 08-31-2022, 11:24 AM

Quote:

Originally Posted by HotSpicyChicken90

Guys....

I did it!

The TB was somehow defective

Car now runs like it has been brought down by a divine unicorn

Hi. Do you have any update status after replace the TB?

HotSpicyChicken90 · 01-04-2023, 09:39 AM

Hello guys.

I'm back again...

I finally found the REAL CULPRIT!

IT WAS THE CHARGEPIPE O-RING...The pipe itself was not securly atteched 100% to the intercooler and the O-Ring was fitted so lose inside the pipe that it wound up on itself. Since i didnt have a new one, i removed 2 cm from the O-ring and glued it together with crazy-glue. It is bomb-tight now.

Also pay attention to the orientation

Now it makes sense...
Since air escaped from this seal, less amount of air entered the engine, hence P0172 "system too rich". Means either too much fuel (or in my case) less air detected by the 02 sensors.

TZ · 01-04-2023, 07:32 PM

After two and half years?

HotSpicyChicken90 · 01-05-2023, 07:17 AM

Yes.
No one was able to help me neither the dealership... smoke testing didn’t work....
I just lived with this issue.

I checked that by coincidence...

Ondras · 02-19-2023, 07:33 PM

Hi, I have similar symptoms on my 2013 528i - N20 engine (4 cylinders 2.0) twin turbo.
cold start - perfect, within a second, holds idle
operating temp start - perfect, within a second, holds idle
engine cooling down - about 30 mins after shut off, the dashboard temp gauge shows a bit above 70 deg. C. - it starts but really low idle and dies a few seconds after. it runs enough to start driving but then loses power, pressing gas does not help and dies in the middle of the road. Trying to start again, it cranks but dies right away. Wait for 5 or 10 minutes, starts again fine, or with some help - pushing the gas paddle to around 2000rpm, then let go of the gas, it settles on good idle and runs fine. the car runs super smooth, with no issues except this.
What would be the recommended steps to check without wasting money or replacing a whole bunch of things without a clear fault found?
The first time this happened I got a few messages on the dash - 1) engine malfunction and 2) something with stop/start. I did not see any message the next few times this happened. But the problem is very reproducible - get the engine to operating temp, shut off, have lunch / wait to ~30 minutes, try to start.
It sounds like the air/gas mixture is not right only in this particular 'cooling down' temperature. What is likely the reason?
Cold and fully warm engine - no problems at all.
Thanks so much in advance.

06-15-2020, 09:43 PM	#24
Trainwreck914 Lieutenant 132 Rep 452 Posts Drives: BMW F10 F15 E39 E90 E53 Join Date: Dec 2019 Location: NY CT iTrader: (0)	That's a lot of $ being thrown at it. Why wouldn't you just take it to shop/expert? Hopefully it comes down to your throttle body. But if not just throw in the towel and take it in. Definitely check your fuel pressure. It could very well be the hpfp
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06-16-2020, 05:03 PM	#25
HotSpicyChicken90 Private 22 Rep 57 Posts Drives: BMW 535i Join Date: Jun 2020 Location: Europe iTrader: (0)	Yeah, that’s the last attempt i’m going to do. So guys I'm getting closer to the root cause... ISTA managed to (finally) throw several codes on the TB! I've never been so happy to see a fault code It said something like: Emergency-position and winding mechanism defect. Also there was a huge difference between live and fixed-values. Now it makes all sense: since the TB did not open properly, the engine did not get the required air-flow - hence SYSTEM TOO RICH So it should be shipped tomorrow. I will let you know. Thanks for the support guys
	Appreciate 1 mediocrechris40.00 Quote

06-18-2020, 07:51 AM	#26
HotSpicyChicken90 Private 22 Rep 57 Posts Drives: BMW 535i Join Date: Jun 2020 Location: Europe iTrader: (0)	Guys.... I did it! The TB was somehow defective Car now runs like it has been brought down by a divine unicorn Attached Images
	Appreciate 5 ezaircon4jc4483.50 beegeezy70.00 OnlyGerman363.50 mediocrechris40.00 Houranimd49252.00 Quote

06-18-2020, 08:58 PM	#27
TZ Second Lieutenant 51 Rep 228 Posts Drives: 2011 535i xDrive, 2014 435i CO Join Date: Mar 2015 Location: NJ iTrader: (0)	Congrats. It is fun following your troubleshooting process. __________________ 2011 535i xDrive Black/Black, Michelin PS AS 4 2014 435i RWD Convertible Service Manual: www.newtis.info Part: http://www.realoem.com
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06-18-2020, 09:04 PM	#28
Trainwreck914 Lieutenant 132 Rep 452 Posts Drives: BMW F10 F15 E39 E90 E53 Join Date: Dec 2019 Location: NY CT iTrader: (0)	Congrats man. Glad you figured it out. Even better you came back to report it!
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06-26-2020, 09:28 AM	#29
mediocrechris Private First Class 40 Rep 111 Posts Drives: 2016 535i xDrive Join Date: Apr 2019 Location: Kentucky iTrader: (0)	What is a TB?
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01-04-2023, 09:39 AM	#36
HotSpicyChicken90 Private 22 Rep 57 Posts Drives: BMW 535i Join Date: Jun 2020 Location: Europe iTrader: (0)	Hello guys. I'm back again... I finally found the REAL CULPRIT! IT WAS THE CHARGEPIPE O-RING...The pipe itself was not securly atteched 100% to the intercooler and the O-Ring was fitted so lose inside the pipe that it wound up on itself. Since i didnt have a new one, i removed 2 cm from the O-ring and glued it together with crazy-glue. It is bomb-tight now. Also pay attention to the orientation Now it makes sense... Since air escaped from this seal, less amount of air entered the engine, hence P0172 "system too rich". Means either too much fuel (or in my case) less air detected by the 02 sensors. Attached Images Last edited by HotSpicyChicken90; 01-04-2023 at 09:50 AM..
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01-04-2023, 07:32 PM	#37
TZ Second Lieutenant 51 Rep 228 Posts Drives: 2011 535i xDrive, 2014 435i CO Join Date: Mar 2015 Location: NJ iTrader: (0)	After two and half years? __________________ 2011 535i xDrive Black/Black, Michelin PS AS 4 2014 435i RWD Convertible Service Manual: www.newtis.info Part: http://www.realoem.com
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01-05-2023, 07:17 AM	#38
HotSpicyChicken90 Private 22 Rep 57 Posts Drives: BMW 535i Join Date: Jun 2020 Location: Europe iTrader: (0)	Yes. No one was able to help me neither the dealership... smoke testing didn’t work.... I just lived with this issue. I checked that by coincidence...
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02-19-2023, 07:33 PM	#39
Ondras New Member 14 Rep 17 Posts Drives: BMW 528i xdrive 2013 Join Date: Feb 2023 Location: BC, Canada iTrader: (0)	Hi, I have similar symptoms on my 2013 528i - N20 engine (4 cylinders 2.0) twin turbo. cold start - perfect, within a second, holds idle operating temp start - perfect, within a second, holds idle engine cooling down - about 30 mins after shut off, the dashboard temp gauge shows a bit above 70 deg. C. - it starts but really low idle and dies a few seconds after. it runs enough to start driving but then loses power, pressing gas does not help and dies in the middle of the road. Trying to start again, it cranks but dies right away. Wait for 5 or 10 minutes, starts again fine, or with some help - pushing the gas paddle to around 2000rpm, then let go of the gas, it settles on good idle and runs fine. the car runs super smooth, with no issues except this. What would be the recommended steps to check without wasting money or replacing a whole bunch of things without a clear fault found? The first time this happened I got a few messages on the dash - 1) engine malfunction and 2) something with stop/start. I did not see any message the next few times this happened. But the problem is very reproducible - get the engine to operating temp, shut off, have lunch / wait to ~30 minutes, try to start. It sounds like the air/gas mixture is not right only in this particular 'cooling down' temperature. What is likely the reason? Cold and fully warm engine - no problems at all. Thanks so much in advance.
	Appreciate 0 Quote