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X3 E83 (2004 - 2010)
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  #1  
Old 07-11-2019, 12:58 PM
Marvn Marvn is offline
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Check engine light on showing p0171 and p0174. I replace plugs,fuel filter, disa valve, oxgen sensors but the code keeps coming back. Not sure what else to do.HELP
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  #2  
Old 07-11-2019, 09:12 PM
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hornhospital hornhospital is offline
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Welcome to Bimmerfest!

I moved your posting to the E83 forum (X3, 2004-2010) so you can get model-specific help.
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  #3  
Old 07-12-2019, 04:09 AM
BMWaufKS BMWaufKS is offline
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1) Clean the MAF, and replace the air filter (if neither are new)

2) Get a BMW-specific code reader such as the Creator C310; there's plenty of double-secret codes.

3) Do a smoke-test to look for vacuum leaks. I hear a very common one on M54s is a cracked intake boot, so if you are very-able you may proactively want to remove, clean, and inspect it carefully for cracks.

Others with M54s will hopefully give you more ideas.

P.S. Soon, make a signature file, for your future posts, with basic info about your X3. See below for an example.
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  #4  
Old 07-12-2019, 08:51 AM
jeepo23 jeepo23 is offline
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Are those not vacuum leak codes?
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  #5  
Old 07-12-2019, 04:14 PM
Marvn Marvn is offline
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I change intake gasket trottle body gasket air filter pcv system replaced.
Also do a smoke test no leak was found.
Am also experiencing rough idle and rpm Serge.
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  #6  
Old 07-12-2019, 05:13 PM
dukedkt442 dukedkt442 is offline
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Very first thing I'd look at is the rubber bellows in the air intake; M54 is notorious for them. Both banks lean supports that idea. Valve cover gasket is another vacuum leak source. It doesn't seem to be misfiring so you can eliminate misfires as a lean source.
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  #7  
Old 07-12-2019, 06:49 PM
Marvn Marvn is offline
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Valve cover gasket seems nice and dry
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  #8  
Old 07-12-2019, 11:55 PM
dynagroove dynagroove is offline
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90% sure you have a vacuum leak somewhere. I purchased a 2004 X3 3.0L last year and had the same codes. There are multiple places that your motor can leak from. I'm going to tell you what I did. I replaced all soft parts on the top end: valve cover gasket + grommets, intake boot, entire CCV system, dip stick tube o-ring, dip stick o-rings, DISA valve rebuild + gasket, throttle body gasket, intake manifold gasket, FI gaskets, vacuum lines, vacuum plugs, other parts I'm sure I'm forgetting. I did a bunch of other work while I was in there, but that's what I did to address the vacuum leak.

Get a scanner. You can get OBD Fusion for $10 for your phone and a $20 LE BT adapter - that's all you'll need for this job. There is a ridiculous amount of information out there on how to fix P0171 & P0174. Spend some time searching and you'll find everything you need.
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Old 07-16-2019, 07:39 AM
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legalfee legalfee is offline
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Old 07-16-2019, 09:14 AM
codog2 codog2 is offline
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I've gotten that code at least three times on my 2005 (200k). First two times - cleaned MAF and it went away. Last time (6 month ago) - needed to replace CCV valve. At the time I was also getting the occasional huge plume of smoke at start up, occasional erratic idle.
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  #11  
Old 07-16-2019, 02:50 PM
Marvn Marvn is offline
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I did all that but the code still coming back. Am going to change the dip stick oring seal next.
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  #12  
Old 07-16-2019, 07:29 PM
dynagroove dynagroove is offline
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Quote:
Originally Posted by Marvn View Post
I did all that but the code still coming back. Am going to change the dip stick oring seal next.
What exactly have you done? Please let us know everything that you have done so that we don't tell you to do something you've already done and so that we know what else you haven't done.

From multiple posts, it seems like you've done the following:

"I replace plugs,fuel filter, disa valve, oxgen sensors"
"I change intake gasket trottle body gasket air filter pcv system replaced."
sounds like you cleaned the MAF as well

Have you replace the valve cover gasket and all grommets?
Have you replaced the intake boot?

I'll repeat what I said in my earlier post:
Get a scanner. You can get OBD Fusion for $10 for your phone and a $20 LE BT adapter - that's all you'll need for this job. There is a ridiculous amount of information out there on how to fix P0171 & P0174. Spend some time searching and you'll find everything you need.

OBD Fusion will not just show and clear codes. It shows you realtime data while the car is running. Fuel trims and O2 sensor performance are important in diagnosing where your car has an issue.
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  #13  
Old 07-16-2019, 09:49 PM
Marvn Marvn is offline
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I have done everything mention in the msg except valve cover gasket and grommets,dip stick o-ring seal
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  #14  
Old 07-17-2019, 10:36 AM
abscate abscate is offline
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How did you do the smoke test? I once smoke tested my E83, with negative results, spending an hour pn the wrong side of the booster check valve,

I won the Moron Mechanic of the Month, or MMM, award, that year
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  #15  
Old 07-17-2019, 11:03 AM
BMWaufKS BMWaufKS is offline
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Search Youtube, and for posts/pics (including mine) on here. E.g., with a latex glove on the intake.
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-------------------------------------------------
Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
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  #16  
Old 07-17-2019, 11:47 AM
Marvn Marvn is offline
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I used the intake boot
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  #17  
Old 07-17-2019, 05:36 PM
dynagroove dynagroove is offline
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Originally Posted by Marvn View Post
I have done everything mention in the msg except valve cover gasket and grommets,dip stick o-ring seal
Dip stick tube o-ring is certainly a possibility, but there is a far greater chance that it's your valve cover gasket if you haven't changed it in the last 30K to 40K miles. These gaskets basically turn to hard plastic over time. It's a regular maintenance item and is very easy to replace. Don't forget to replace the grommets as well as they are part of the seal. You will also need some gasket sealer for the areas around the VANOS unit. Kits with everything you need are available and there are plenty of how-to videos to explain the process as well.

BTW, OBD Fusion can tell you if you have a large air leak or a small air leak based on what the fuel trim readings are. It can also give you an idea if your MAF is working in the correct range.
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  #18  
Old 07-17-2019, 07:50 PM
Marvn Marvn is offline
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I have a OBD2 scanner that i used its giving me a vaccum reading of 19-20psi when the vehicle is in park and 12-15psi
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  #19  
Old 07-17-2019, 07:50 PM
Marvn Marvn is offline
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In gear *
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  #20  
Old 07-18-2019, 03:33 AM
abscate abscate is offline
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You canít trace a vacuum leak with a gauge. The amount of leak needed to kick out a fuel trim code is very small.

If you monitor the short term fuel trim at idle and at 2500 rpm it will tell you If unmetered sir ( vacuum leak) is happening.
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  #21  
Old 07-18-2019, 04:49 AM
BMWaufKS BMWaufKS is offline
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The "paint can" smoke tester (some on eBay) is a crude but effective tool for doing the smoke test. Wear PPE, and be safe!
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-------------------------------------------------
Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
Reply With Quote
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