E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > n52 compression test issue



Reply
 
Thread Tools Search this Thread
      02-15-2013, 02:01 PM   #1
pepsih
Captain
 
pepsih's Avatar
 
Drives: E90 335i
Join Date: Oct 2011
Location: Currently NY

Posts: 689
iTrader: (2)

n52 compression test issue

Today, my brother did a compression test on his E90 325i EU version.
so here are the results.

CYLINDER 1: 15bar(around 220lbs) spark plug clean
CYLINDER 2: 14bar(around 209lbs) spark plug dirty
CYLINDER 3: 15bar(around 220lbs) spark plug little smoked
CYLIDNER 4: 15bar(around 220lbs) spark plug clean
CYLIDNER 5: 14.3bar (around 210 lbs) spark plug clean
CYLIDNER 6: 15bar(around 220lbs) spark plug clean

What should be the correct pressure on the cylinders?
( the engine was preheat before the mesurements)



Cylinder 2





Cylinder 3






Cylinder 5


/
pepsih is offline   France
0
Reply With Quote
      02-15-2013, 07:42 PM   #2
e90pilot
Freight Dawg
 
e90pilot's Avatar
 
Drives: E90 325i
Join Date: Jul 2005
Location: Oakland, CA

Posts: 2,090
iTrader: (3)

I'm not sure what it should be exactly but that looks good. How many miles?
__________________
--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors
e90pilot is offline   United_States
0
Reply With Quote
      02-15-2013, 09:29 PM   #3
pepsih
Captain
 
pepsih's Avatar
 
Drives: E90 335i
Join Date: Oct 2011
Location: Currently NY

Posts: 689
iTrader: (2)

the car has around 67k miles (107k km)
the problem actually is that he has to add a quart of oil every 400-500 miles!
pepsih is offline   France
0
Reply With Quote
      02-15-2013, 10:17 PM   #4
e90pilot
Freight Dawg
 
e90pilot's Avatar
 
Drives: E90 325i
Join Date: Jul 2005
Location: Oakland, CA

Posts: 2,090
iTrader: (3)

Either a leak or valve guide. That's a quite a lot of oil!
__________________
--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors
e90pilot is offline   United_States
0
Reply With Quote
      02-15-2013, 10:24 PM   #5
pepsih
Captain
 
pepsih's Avatar
 
Drives: E90 335i
Join Date: Oct 2011
Location: Currently NY

Posts: 689
iTrader: (2)

Definitely not a leak.
The car is going to the shop probably on sunday.
we'll see
pepsih is offline   France
0
Reply With Quote
      02-16-2013, 10:15 AM   #6
volkswackin
Lieutenant Colonel
 
Drives: too broke for a BMW
Join Date: Jan 2008
Location: i get around..

Posts: 1,904
iTrader: (1)

Your sure its not a leak? I've never had an oil consumption issue on an n52...ever...even ones will over double those miles.
volkswackin is offline   United_States
0
Reply With Quote
      02-22-2013, 06:10 PM   #7
smellthebeans
Major
 
smellthebeans's Avatar
 
Drives: LPCs
Join Date: Dec 2006
Location: California Central Coast

Posts: 1,493
iTrader: (2)

Garage List
2011 328i Coupe  [0.00]
1990 325i  [0.00]
thats quite a bit indeed! He should be seeing plenty of blue smoke if its the valves or blow by.

Could it be a faulty head gasket (doubtful based on the pressure test results).

It could also be a faulty oil water separator this was pretty common with the M54 engine.
__________________
smellthebeans is offline   United_States
0
Reply With Quote
      02-22-2013, 06:18 PM   #8
GoRomeo
Colonel
 
GoRomeo's Avatar
 
Drives: 330i
Join Date: Feb 2006
Location: San Diego CA

Posts: 2,087
iTrader: (0)

Garage List
2006 330i  [2.83]
dang that looks bad no matter what it is... I recently changed my plugs at 100k miles and did not look nearly as that... Keep us posted.
GoRomeo is offline  
0
Reply With Quote
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
Forum Jump


All times are GMT -5. The time now is 08:17 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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