N57 Trouble Starting

TZANIDO777 · 11-26-2019, 09:46 AM

Hi everyone,

Ill start by saying I have a 15 X5 35D with 63K miles and I figured I would post here as there is not much information regarding diesels on the X5 side of the forums.

I have been having intermitten trouble starting the car or rough start up. Its very random when it happens as in its not every cold start and once it starts the first time it has no trouble starting after that through out the day.

It will crank and rev to 500 rpm, pause for less than a second and then go to the full 1000 or so where it idles rough for abour 2-3 seconds. After that it runs without any issues at all, no rough idle or anything like that.

This is happening in 40-50F weather.

I changed the fuel filter out about 10k miles ago at 53K miles. The car now has about 63K miles on it. I have been filling up at the same BP diesel gas station for the past 5 years or so of ownership as well as my parents who also have a diesel 3 series without any issues.

There is no CEL or any codes that come up when scanning the car.

I wanted to reach out to see if anyone had any suggestions on what it could possibly be?

Nadir Point · 11-26-2019, 10:09 AM

What's the low-side fuel pressure at idle?

TZANIDO777 · 11-26-2019, 11:35 AM

At the moment, i do not have any means of checking for the fuel pressure on the low side. Is this done with Ista?

RL18 · 11-26-2019, 12:57 PM

Run a decent additive through it every fill up and see if the problem goes away. I use opti-lube winter blend and the xpd in the summer

TZANIDO777 · 11-26-2019, 02:37 PM

I was planning on trying to use some additive. Thanks

Mik325tds · 12-01-2019, 10:29 AM

It's probably best to get a $35 OBD USB cable and download Test-o. Then chart fuel pressure before HPFP, rail pressure, injection quantity during start to see where the gremlins are.

TZANIDO777 · 12-03-2019, 04:48 PM

Welp, I hate to say it but this past Saturday the car would not start at all. Scanned for codes and got nothing but " Microphone; open circuit". Decided to have it towed to BMW 4 miles away. The diagnosis was a blown engine. They said the timing chain skipped and the engine started knocking when they got the car started.

Really do not know where to go from here being the car is out of warranty but awaiting a final decision from the service department regarding the car.

11-26-2019, 09:46 AM	#1
TZANIDO777 Lieutenant 73 Rep 527 Posts Drives: 2011 E82 135i, 2015 F15 X5 35D Join Date: Dec 2010 Location: NY iTrader: (2) Garage List 2020 BMW X5 40i [0.00] 2011 BMW 135i [0.00]	N57 Trouble Starting Hi everyone, Ill start by saying I have a 15 X5 35D with 63K miles and I figured I would post here as there is not much information regarding diesels on the X5 side of the forums. I have been having intermitten trouble starting the car or rough start up. Its very random when it happens as in its not every cold start and once it starts the first time it has no trouble starting after that through out the day. It will crank and rev to 500 rpm, pause for less than a second and then go to the full 1000 or so where it idles rough for abour 2-3 seconds. After that it runs without any issues at all, no rough idle or anything like that. This is happening in 40-50F weather. I changed the fuel filter out about 10k miles ago at 53K miles. The car now has about 63K miles on it. I have been filling up at the same BP diesel gas station for the past 5 years or so of ownership as well as my parents who also have a diesel 3 series without any issues. There is no CEL or any codes that come up when scanning the car. I wanted to reach out to see if anyone had any suggestions on what it could possibly be?
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11-26-2019, 10:09 AM	#2
Nadir Point Lieutenant 103 Rep 579 Posts Drives: Diesel Join Date: Dec 2015 Location: CO iTrader: (0)	What's the low-side fuel pressure at idle?
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11-26-2019, 11:35 AM	#3
TZANIDO777 Lieutenant 73 Rep 527 Posts Drives: 2011 E82 135i, 2015 F15 X5 35D Join Date: Dec 2010 Location: NY iTrader: (2) Garage List 2020 BMW X5 40i [0.00] 2011 BMW 135i [0.00]	At the moment, i do not have any means of checking for the fuel pressure on the low side. Is this done with Ista?
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11-26-2019, 12:57 PM	#4
RL18 Major 274 Rep 1,054 Posts Drives: 2011 335d sport Join Date: Nov 2017 Location: Maine iTrader: (0)	Run a decent additive through it every fill up and see if the problem goes away. I use opti-lube winter blend and the xpd in the summer __________________ 2011 335d tuned by B.R.R. 2011 X5 35d tuned by B.R.R.
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11-26-2019, 02:37 PM	#5
TZANIDO777 Lieutenant 73 Rep 527 Posts Drives: 2011 E82 135i, 2015 F15 X5 35D Join Date: Dec 2010 Location: NY iTrader: (2) Garage List 2020 BMW X5 40i [0.00] 2011 BMW 135i [0.00]	I was planning on trying to use some additive. Thanks
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12-01-2019, 10:29 AM	#6
Mik325tds Major 806 Rep 1,191 Posts Drives: 335d M-Sport Join Date: Jul 2014 Location: Greater Detroit iTrader: (0)	It's probably best to get a $35 OBD USB cable and download Test-o. Then chart fuel pressure before HPFP, rail pressure, injection quantity during start to see where the gremlins are.
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12-03-2019, 04:48 PM	#7
TZANIDO777 Lieutenant 73 Rep 527 Posts Drives: 2011 E82 135i, 2015 F15 X5 35D Join Date: Dec 2010 Location: NY iTrader: (2) Garage List 2020 BMW X5 40i [0.00] 2011 BMW 135i [0.00]	Welp, I hate to say it but this past Saturday the car would not start at all. Scanned for codes and got nothing but " Microphone; open circuit". Decided to have it towed to BMW 4 miles away. The diagnosis was a blown engine. They said the timing chain skipped and the engine started knocking when they got the car started. Really do not know where to go from here being the car is out of warranty but awaiting a final decision from the service department regarding the car.
	Appreciate 0 Quote