Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

Reply
 
Thread Tools Display Modes
  #1  
Old 11-30-2012, 04:05 PM
BUZZ_PLUS BUZZ_PLUS is offline
Registered User
Location: Cairo
 
Join Date: Jan 2009
Posts: 72
Mein Auto: E46
Can anybody solve this riddle !!

I'm a bimmer for more than 10 years I have an E46 2000 with M52 engine Recently my car showed more fuel consumption , I thought it's the age or something but after no long time when I start the car it won't start !! the engine rpm goes up and then drops quickly I checked the ICV and cleaned it and got nothing,, after some trials I realized that the engine can start after the third or the fourth ignition trial then the engine is hesitated for 3-4 seconds and behaves as if one of the spark plugs is not working then it goes just fine.

I used the OBD scanner got codes of a faulty Crank positioning sensor, Miss fire and a faulty oxygen sensor
after a week with this mess I ran the scan again found same codes except the o2 sensor which I think it throw the code from the first time bad ignition !

the main symptoms are :
1-There is an obvious loss in power that I feel that the belts doesn't rotate with their full speed,even when going on steep ground or a garage i need to pump more fuel
2- high fuel consumption
3- some times when pressing the gas pedal while ignition to increase RPM the red battery sign in the cluster glows for 2 seconds then turn off
4-Hesitated engine while Idling

Share your thoughts with me please ,, seems like a tough job to do
Reply With Quote
Ads by Google
  #2  
Old 11-30-2012, 04:07 PM
skwidrific skwidrific is offline
Officially Welcomed to the 'Fest
Location: centreville, va
 
Join Date: Oct 2011
Posts: 106
Mein Auto: 323i, Ducati M1100
Vanos?
Reply With Quote
  #3  
Old 11-30-2012, 04:19 PM
ahull's Avatar
ahull ahull is offline
Officially Welcomed to the 'Fest
Location: Carolina
 
Join Date: Apr 2006
Posts: 3,344
Mein Auto: ist schnell! (03 330i SC)
High fuel consumption is symptom of bad oxygen sensors. pre-cat oxygen sensors (in exhaust manifold by engine) usually die around 100,000 miles. If you're getting a code and they haven't been replaced, probably time to replace them. At the age of your car, if you're getting crank sensor error, I'd replace that too.

Misfires - how old are spark plugs? If more than 60k miles on them, start there, then you might need to test for dying coil packs. Usually you change the misfiring coil to another cylinder and see if the error code follows it to isolate a particular coil.

EDIT - if you are just having to press the gas more like it's not getting enough gas, you could be looking at a clogged fuel filter or dying fuel pump. Fuel filter is a 60-80k miles maintenance item. Fuel pumps average 8-12 years of reliability.

Last edited by ahull; 11-30-2012 at 04:22 PM.
Reply With Quote
  #4  
Old 11-30-2012, 04:35 PM
BUZZ_PLUS BUZZ_PLUS is offline
Registered User
Location: Cairo
 
Join Date: Jan 2009
Posts: 72
Mein Auto: E46
I was thinking of a fuel pump or crankcase ventilation valve , anybody agree ?
Reply With Quote
  #5  
Old 11-30-2012, 04:52 PM
j_schroeder's Avatar
j_schroeder j_schroeder is offline
Officially Welcomed to the 'Fest
Location: michigan
 
Join Date: Dec 2011
Posts: 195
Mein Auto: 330ci
Did you change the crank sensor?
__________________

2001 330CI
Reply With Quote
  #6  
Old 11-30-2012, 08:19 PM
mlukas161's Avatar
mlukas161 mlukas161 is offline
Officially Welcomed to the 'Fest
Location: WNY
 
Join Date: Oct 2008
Posts: 933
Mein Auto: 03 330i, 04 X3
I would guess fuel pump and / or oxygen sensors.
__________________
Reply With Quote
  #7  
Old 12-08-2012, 11:56 AM
BUZZ_PLUS BUZZ_PLUS is offline
Registered User
Location: Cairo
 
Join Date: Jan 2009
Posts: 72
Mein Auto: E46
Changed the fuel pump and the CCV and nothing happened :S I'll go for the cps
Reply With Quote
  #8  
Old 12-08-2012, 12:10 PM
Fast Bob's Avatar
Fast Bob Fast Bob is offline
Keeping it surreal
Location: Here, there, everywhere....
 
Join Date: Jun 2004
Posts: 34,362
Mein Auto: 2004 330Ci ZHP 3 pedals
Quote:
Originally Posted by BUZZ_PLUS View Post
Changed the fuel pump and the CCV and nothing happened :S I'll go for the cps
Oxygen sensors !
__________________
The road goes ever onward....
(R.I.P. Jever)

*Please support the Wounded Warrior Project*

When faced with choosing between two evils, always go with the one you`ve never tried before....
Reply With Quote
  #9  
Old 12-08-2012, 12:19 PM
Dave 330i's Avatar
Dave 330i Dave 330i is offline
The King of Common Sense
 
Join Date: Jan 2002
Posts: 130
Send a message via Skype™ to Dave 330i
Mein Auto:
intermittent crankshaft sensor. My '01 330i (M54 engine) with 143K miles since new never had O2 sensors replaced. I can't imagine they could last that long. So, my intuition is that the oxygen sensor does very little from normal operation.
__________________
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid. Albert Einstein

Swim upstream. Go the other way. Ignore the conventional wisdom. If everybody is doing it one way, there’s a good chance you can find your niche by going exactly in the opposite direction", Sam Walton.

Last edited by Dave 330i; 12-08-2012 at 12:26 PM.
Reply With Quote
  #10  
Old 12-09-2012, 11:00 AM
GoForthFast GoForthFast is offline
Officially Welcomed to the 'Fest
Location: New York
 
Join Date: Jul 2004
Posts: 2,348
Mein Auto: '04 330Ci 6-speed
I wouldn't be so skeptical as you. Oxygen sensors provide valuable feedback to control fuel/air mixture for proper running and good mileage.
I'd guess yours are working better than zero. Get a live reading of their function to explore.
Reply With Quote
  #11  
Old 01-12-2013, 02:55 PM
BUZZ_PLUS BUZZ_PLUS is offline
Registered User
Location: Cairo
 
Join Date: Jan 2009
Posts: 72
Mein Auto: E46
Relief your self guys it was a cracked cylinder head and it had its effect on all sensors A/f mixture and water consumption, I fixed the problem though wiped out my pockets and its working fine now
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)
Today's Posts Search
Thread Tools
Display Modes

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 On



Forum Jump


All times are GMT -7. The time now is 01:18 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms