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 11-26-2012, 08:51 AM
ScottyWM ScottyWM is offline
Registered User
Location: Apex, NC
 
Join Date: Jan 2012
Posts: 6
Mein Auto: '93 525iT, '00 328I
P1624 CEL Code

Troubleshooting my daughter's 2000 328i with about 130k miles. I only see the car a few times a year so I don't have a lot of information on it. She has just started getting the CEL, had the codes read and got P1624. This would seem to indicate a bad (stuck open) t-stat from the searching I've done. She says the temp needle does not go up to 12 o'clock like normal, stays down in the cold area unless she is stopped in traffic. Seems like a quick, easy fix to do.

But, here's the first question - the car sometimes stalls when cold (at startup), and the revs will sometimes undulate 100-200 rpm when cold at startup too. (The undulating might lead to the stalling, she wasn't sure.) Could this be still the t-stat?

Second, I've replaced probably 30 t-stats in my life - I've never heard of replacing the the t-stat housing with the t-stat. But looking at RealOEM and Bavarian Auto it appears that the t-stat is integrated into the housing. Is that right? Why? Just so they can charge $75 bucks instead of $5 bucks?

She's had the car about a year, previous maintenance was impeccable and done at BMW dealer. Whole cooling system was redone not too many miles ago so should be in good shape other than the t-stat. Mainly curious if the undulating could be because it is running cold or if it might be the ICV or something else.
__________________
Scott
'93 525iT 225k miles, '00 328i, '08 Saab 9-3 Aero, '78 MGB
Reply With Quote
Advertisement
  #2  
Old 11-27-2012, 09:30 AM
Sean330xi Sean330xi is offline
Registered User
Location: Iowa
 
Join Date: Jan 2010
Posts: 26
Mein Auto: 2002 330Xi with SportPack
Just wanted to address your issue with the thermostat. I just had to do this myself on my 02' 330 and there are a couple of things I found that I can tell you. First, you do have to replace the housing with the thermostat. No way around that....Second, you will have to remove the radiator fan to access all the screws holding the thermostat in place. I started in on the repair not realizing that I needed a special tool to hold the fan clutch in place or it just spins and makes it really hard to loosen up. The tool needed is a #1703 fan clutch tool that BMW makes. I hope this helps you out a bit. It took me about an hour and half to do the repair but if you have experience already it will probably take you even less time.
Reply With Quote
  #3  
Old 11-27-2012, 10:54 AM
ScottyWM ScottyWM is offline
Registered User
Location: Apex, NC
 
Join Date: Jan 2012
Posts: 6
Mein Auto: '93 525iT, '00 328I
Thanks, did you have the 1624 code too? Did you see anything funny with the idle when it was running cold?

In the past I've been able to remove the fan with just a big wrench and whack it with a big hammer (LH thread).
__________________
Scott
'93 525iT 225k miles, '00 328i, '08 Saab 9-3 Aero, '78 MGB
Reply With Quote
  #4  
Old 11-27-2012, 11:32 AM
1972ford's Avatar
1972ford 1972ford is online now
Function over fashion
Location: NH
 
Join Date: Jun 2009
Posts: 807
Mein Auto: 325xiT
Quote:
Originally Posted by ScottyWM View Post

In the past I've been able to remove the fan with just a big wrench and whack it with a big hammer (LH thread).
Presumably her car is an automatic? Otherwise you won't have to do that whole step...
__________________
Reply With Quote
  #5  
Old 11-27-2012, 11:32 AM
Sean330xi Sean330xi is offline
Registered User
Location: Iowa
 
Join Date: Jan 2010
Posts: 26
Mein Auto: 2002 330Xi with SportPack
Strangely enough I didn't have that code.....I just knew the thermostat was stuck open. I was having some rough idle issues but mine were related to a bad PCV valve.
Reply With Quote
  #6  
Old 11-27-2012, 11:43 AM
ScottyWM ScottyWM is offline
Registered User
Location: Apex, NC
 
Join Date: Jan 2012
Posts: 6
Mein Auto: '93 525iT, '00 328I
Quote:
Originally Posted by 1972ford View Post
Presumably her car is an automatic? Otherwise you won't have to do that whole step...
That is correct
__________________
Scott
'93 525iT 225k miles, '00 328i, '08 Saab 9-3 Aero, '78 MGB
Reply With Quote
  #7  
Old 12-28-2012, 11:42 AM
ScottyWM ScottyWM is offline
Registered User
Location: Apex, NC
 
Join Date: Jan 2012
Posts: 6
Mein Auto: '93 525iT, '00 328I
So just finished replacing the thermostat and belts. No problem there. Engine warms up nicely and code is gone. But this didn't fix the surging at cold idle problem. And, we just noticed that sometimes (only twice actually), that when it does the surging, the temp needle will peg out Hot - even though the car was just started and we know it's not hot at all. Turn key off, back to on, and temp needle will be normal. I was hoping changing the thermostat would fix this, but it didn't...

Sounds like it must be a sensor? Any ideas on this?

Surging RPM:


Then after turning the car off restarting:
__________________
Scott
'93 525iT 225k miles, '00 328i, '08 Saab 9-3 Aero, '78 MGB

Last edited by ScottyWM; 12-28-2012 at 11:48 AM.
Reply With Quote
  #8  
Old 12-28-2012, 06:11 PM
smolck's Avatar
smolck smolck is offline
ROLL TIDE!
Location: Birmingham, AL
 
Join Date: Jul 2007
Posts: 22,348
Mein Auto: 2004 ZHP Sedan
Quote:
Originally Posted by ScottyWM View Post

Sounds like it must be a sensor? Any ideas on this?
The M52tu motor found in your vehicle is known to have poor cold idle qualities when the VANOS seals are shot. Had the same problem on my old 323 and numerous customer cars. Does the car do that when it is warmed up or only when cold?

If only when cold then there is a 95% chance it is the VANOS seals. 60 bucks and easy to rebuild. Somewhere on my YouTube page I think there is a video of my 323 both pre and post VANOS rebuild

Sent from my One X using Bimmer App
__________________

Check out my YouTube Channel for DIY's and other fun stuff HERE
Check out my BMWBLOG!
Quote:
Originally Posted by Fast Bob View Post
now, go burn your Man Card, and buy yourself a Camry....
Reply With Quote
  #9  
Old 12-29-2012, 01:55 PM
ScottyWM ScottyWM is offline
Registered User
Location: Apex, NC
 
Join Date: Jan 2012
Posts: 6
Mein Auto: '93 525iT, '00 328I
Thanks, and I've bookmarked your youtube page! I saw the post-repair video, but not the pre-repair. Yes, it only does it when cold. Now to search for the DIY how-to on this repair.
__________________
Scott
'93 525iT 225k miles, '00 328i, '08 Saab 9-3 Aero, '78 MGB
Reply With Quote
  #10  
Old 12-29-2012, 11:01 PM
smolck's Avatar
smolck smolck is offline
ROLL TIDE!
Location: Birmingham, AL
 
Join Date: Jul 2007
Posts: 22,348
Mein Auto: 2004 ZHP Sedan
Quote:
Originally Posted by ScottyWM View Post
Thanks, and I've bookmarked your youtube page! I saw the post-repair video, but not the pre-repair. Yes, it only does it when cold. Now to search for the DIY how-to on this repair.
Just go to beisansystems.com and look at the dual VANOS repair procedure. Never a better DIY has been written

Sent from my One X using Bimmer App
__________________

Check out my YouTube Channel for DIY's and other fun stuff HERE
Check out my BMWBLOG!
Quote:
Originally Posted by Fast Bob View Post
now, go burn your Man Card, and buy yourself a Camry....
Reply With Quote
  #11  
Old 12-30-2012, 09:35 AM
ScottyWM ScottyWM is offline
Registered User
Location: Apex, NC
 
Join Date: Jan 2012
Posts: 6
Mein Auto: '93 525iT, '00 328I
Thanks, great information! And it looks like the guy who started that company to sell the kits is right here where I live in Raleigh. Seems like a simple enough job (although time intensive), trouble is that the car is my daughter's and is only here at my place a couple times a year (away at college). If she can't live with it the way it is until the next visit, she'll have to pay big $$ to get it fixed.
__________________
Scott
'93 525iT 225k miles, '00 328i, '08 Saab 9-3 Aero, '78 MGB
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 02:07 AM.


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