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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 05-15-2011, 03:11 AM
joecorp joecorp is offline
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Engine code po171

I had codes po174 and po171... I changed the crakcase ventalation ...cleared the codes and only po171 came back AGAIN. I'm thinking Oxygen sensors... any thoughts???

Last edited by joecorp; 05-15-2011 at 03:12 AM. Reason: spelling errors
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  #2  
Old 05-15-2011, 03:36 AM
Dean Long Dean Long is offline
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Mein Auto: BMW 540i (99) Silver
hello, how did you get these codes? Sorry I have no idea whats wrong with these Cars.Not reliable at all.
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  #3  
Old 05-15-2011, 05:07 AM
JimLev JimLev is offline
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Quote:
Originally Posted by Dean Long View Post
hello, how did you get these codes? Sorry I have no idea whats wrong with these Cars.Not reliable at all.
You read the codes with a code reader.

Joe, could be a bad front O2 sensor. How many miles on your car? Have they ever been changed? Probably not a leak in the intake because it's only bank 1, but it wouldn't hurt to check all of the air tubes just to make sure.
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  #4  
Old 05-15-2011, 06:55 AM
pshovest pshovest is offline
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I bet the P0174 code will return. This was a leaking DISA valve on my '01 530i. A layer of permatex form-a-gasket fixed the vacuum leak.

http://www.e46fanatics.com/forum/sho...d.php?t=576774

Paul S
BMW CCA 69606


Quote:
Originally Posted by joecorp View Post
I had codes po174 and po171... I changed the crakcase ventalation ...cleared the codes and only po171 came back AGAIN. I'm thinking Oxygen sensors... any thoughts???
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  #5  
Old 05-15-2011, 07:31 AM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by pshovest View Post
A layer of permatex form-a-gasket fixed the vacuum leak.
Hi Paul,
To help others, I added your recommended E46 M54 thread to the misfire diagnostic tree:
- How to diagnose a misfire in the E39 (1)

As an aside, I see you're methodical (based on your E46 P071 & P074 rough idle timeline); so I'm curious why use permatex instead of replacing the (inexpensive) M54 O-ring? (Maybe the o-ring source wasn't known at the time?)

More to the point, if the OP were to find the same o-ring leak, since a source has been found, would you still recommend the permatex or would you buy a new DISA o-ring?

- Where to get just the M54 DISA valve o-ring (1)
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Last edited by bluebee; 05-15-2011 at 07:39 AM.
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  #6  
Old 05-15-2011, 08:47 AM
pshovest pshovest is offline
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Bluebee, I made the repair in Nov '09. Temp had dropped to the low 20's, the car was left outside overnight. While idling to defrost I noticed a very slightly rough idle. Check engine light came on during the 2 hour ride home. Codes P0171 and 0174 were read. I came across the E46 DIY and decided to give it a try. Most DIYer's have a tube of form-a-gasket. I was not optimistic that this would fix my codes, but this repair took 20 minutes....I had nothing to lose.

No one had proposed an oring solution when I had the problem and I'm not convinced the oring fix is the best. The M52TU uses an oring, but the M54 DISA seal is not an oring. It is a molded part that doesn't have a round cross section. If the replacement oring is too thick, the DISA won't be properly seated and sealed in the intake manifold. Notice the two vertical sealing strips on the DISA in the photo? The Form-a-gasket fix is less likely to interfere with these seals.

It's been 15k miles and all is well.

Paul S
BMW CCA 69606
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  #7  
Old 05-15-2011, 05:56 PM
joecorp joecorp is offline
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Engine code po171

I had code po174 also the crankcase ventilation fixed that issue...... I'm gonna go ahead and change the o2 sensors and see what happens...
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  #8  
Old 05-15-2011, 10:58 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by pshovest View Post
the M54 DISA seal is not an oring. It is a molded part that doesn't have a round cross section.
Here's what it looks like, from RDL in the Disa o-ring thread:
- E39 (1997 - 2003) > DISA 0 Ring



Quote:
Originally Posted by pshovest View Post
Notice the two vertical sealing strips on the DISA in the photo? The Form-a-gasket fix is less likely to interfere with these seals.
I've never heard of these 'vertical sealing strips'. I annotated the photo below of what I 'think' you're referring to.

Are you intimating that the rectangular-cross-section o-ring and the y-shaped (sort of) vertical sealing strips are all one molded piece?
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Last edited by bluebee; 05-15-2011 at 10:59 PM.
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  #9  
Old 05-16-2011, 06:10 AM
poolman poolman is online now
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There are many spots that vacuum leaks may appear on our engines. Do a search on the forum regaurding
Battling vacuum leaks and read up. 02 sensors would be the last thing I would point at.
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  #10  
Old 05-16-2011, 06:19 AM
pshovest pshovest is offline
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Yes, you have identified the "vertical sealing strips" I was referring to. My recollection, from doing this 18 months ago, is that all of the red sealing strips are connected to one another. This includes the bottom of the "Y" connection to the "oring". Someone went to a lot of trouble to design such an elaborate seal. There are two problems with the Ebay oring fix. One is that it severs the connection to the bottom of the "Y" sealing strip. The second is that if the oring doesn't compress fully, the DISA won't be fully inserted and the other sealing strips won't be able to do their jobs. The form-a-gasket fix eliminates this problem, as any excess sealant simply squeezes out.

Paul S
BMW CCA 69606



Quote:
Originally Posted by bluebee View Post
Here's what it looks like, from RDL in the Disa o-ring thread:
- E39 (1997 - 2003) > DISA 0 Ring





I've never heard of these 'vertical sealing strips'. I annotated the photo below of what I 'think' you're referring to.

Are you intimating that the rectangular-cross-section o-ring and the y-shaped (sort of) vertical sealing strips are all one molded piece?
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