E90Post
 


Extreme Powerhouse
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Help me diagnose



Reply
 
Thread Tools Search this Thread
      08-01-2014, 01:38 PM   #1
deeLow
DOPE
deeLow's Avatar
148
Rep
759
Posts

Drives: F80
Join Date: Jan 2014
Location: Earth

iTrader: (2)

Help me diagnose

An intermittent slow crank.

Alright, so my car has been suffering from this for a few weeks now at random. I can hop in and immediately start the car without any wait and it cranks right away. Other times, I can wait with ignition on and it will crank slowly. Completely hit or miss.

Car currently has P2a2d - fuel pressure low - stored but no CEL. Code actually came up after I was playing with INPA trying to test the fuel system. Never really found what I was looking for and wasn't there before this. I've gotten the occasional 2aaf but its been a while for that.

So far i've tried datalogging it while it was starting and have gotten quick and slow cranks at different times. Under WOT on multiple different logs both fuel pumps show that they are having no problem keeping up with demand. See for self here.

http://datazap.me/u/kingdlo/some-pul...zoom=1636-1780
some pulls in here where you can see a run through the gears and pumps keeping up no problem

http://datazap.me/u/kingdlo/starting...h?log=0&data=2
Above log is some starting, and one where I launched the car, but thats not the issue here. You can clearly see pumps are putting out what the car requests if not more.

Sometimes I get a nice exhaust smell coming from the back after a longish crank.

I've narrowed it down to possibly leaking injectors where they are leaking after I shut the car off, but not sure how to really diagnose that. Or a possible bad LPFP sensor. I've read somewhere that when the sensor is bad it will request a constant output regardless of load instead of going up and down with request. HPFP goes up and down, LPFP does not. LPFP constantly requests about 72-73 or so no matter what.

Thoughts/suggestions? Anyway I can accurately narrow it down?
Appreciate 0
      08-01-2014, 04:01 PM   #2
deeLow
DOPE
deeLow's Avatar
148
Rep
759
Posts

Drives: F80
Join Date: Jan 2014
Location: Earth

iTrader: (2)

Another thing I've noticed is when there is high humidity and the car has been sitting for a little while is usually always when it gives me the long crank. Low humidity or car was recently running within last 10 minutes no long crank.
Appreciate 0
      08-02-2014, 02:28 AM   #3
deeLow
DOPE
deeLow's Avatar
148
Rep
759
Posts

Drives: F80
Join Date: Jan 2014
Location: Earth

iTrader: (2)

Up please help
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 11:49 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST