E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Lean codes p0171 p0174



Reply
 
Thread Tools Search this Thread
      03-23-2025, 03:23 PM   #1
Bashford21
New Member
2
Rep
11
Posts

Drives: 2006 e90
Join Date: Mar 2025
Location: Vermont

iTrader: (0)

Lean codes p0171 p0174

I am working through the diag on this. a smoke test showed no leaks externally. as im new to the BMW realm i have done some considerable reading on the topic of lean codes, PCV system and the valve cover. things i know:

New valve cover gasket, aluminum cover, no oil leaks in that area.
No external air leaks from the crankcase through the intake system.
No air leaks from the airbox thru the intake manifold.

What i dont know for sure and i assume is that the pcv is stuck open. for the price of it im going to just replace it and move on. when i shake it it does not rattle or sound as if the valve inside is loose i can blow through it with a small amount of restriction. i have ordered one and in the mean time am going to just take my dremel to the old one and see what makes it tick, or not tick in this case.

I have read of a flap inside the valve cover. does this flap prevent flow? or is that to valve on the intakes job?

thanks for any input
Appreciate 0
Reply

Bookmarks


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 03:36 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, 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