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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 01-23-2013, 04:15 PM
iceman4169 iceman4169 is offline
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MAF only?

So the car has had massive loss of power and acceleration. It isnt right and gas mileage is completely down the drain. I pulled the codes and got these... P0170 and P0173. I havent gotten a clear answer to what they mean. But i have an idea its fuel trim bank 1 or 2? This morning I disconnected my MAF and my car felt alive again! Felt like i got like 75 hp difference i kid you not. Is this it? Is this only the MAF? Other possibilities I've heard can be pre cat o2 sensors. Someone have some input on this? I need a more knowledgeable on this please.
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  #2  
Old 01-23-2013, 04:50 PM
Steve530 Steve530 is offline
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Not sure about your V8, but on the I6 these codes are typically caused by an un-metered air leak. You might want to check the intake boots, the vacuum lines ant the CCV system. Those are relatively cheap to repair.
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  #3  
Old 01-23-2013, 06:08 PM
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hh3uunp hh3uunp is offline
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Replace the MAF even with the MAF unplugged you won't have max Power! When you unplugged the MAF did new codes pop up if they didn't then common sense would tell me thats your problem
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  #4  
Old 01-23-2013, 06:11 PM
AlexandruE39 AlexandruE39 is offline
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I just change my cam sensor and that did the trick to get my engine light to go off. I had a bunch of the same codes before but it took only one part to fix all 5! Try and change that plus clean the maf sensor. Look how to do this properly before breaking it and having to spend more money. Good luck!
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Old 01-23-2013, 06:13 PM
AlexandruE39 AlexandruE39 is offline
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97 540i btw I forgot to say what car, same just no Vanos crap involved
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  #6  
Old 01-23-2013, 06:28 PM
iceman4169 iceman4169 is offline
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Alright guys. Craziest thing. Couldnt tell exactly because some of the leds are burned out. But im driving on the highway, and something pops up on the dash and beeps a lot. I think it was German? It said ( Gurt er legan ) What the heck was that!
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  #7  
Old 01-23-2013, 06:32 PM
iceman4169 iceman4169 is offline
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http://s1292.beta.photobucket.com/us...802a7.jpg.html
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  #8  
Old 01-23-2013, 06:33 PM
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hh3uunp hh3uunp is offline
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Quote:
Originally Posted by iceman4169 View Post
Alright guys. Craziest thing. Couldnt tell exactly because some of the leds are burned out. But im driving on the highway, and something pops up on the dash and beeps a lot. I think it was German? It said ( Gurt er legan ) What the heck was that!
That's German for "go put your head up a pig" but in all seriousness was a lot of lights flashing because when it beeps a lot and yells at you you should have it towed and get the codes
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  #9  
Old 01-23-2013, 06:37 PM
Ari03e39 Ari03e39 is offline
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Can't really read it. Try another pic. Gurt ur could translate to 'belt for'
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  #10  
Old 01-23-2013, 08:42 PM
iceman4169 iceman4169 is offline
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Belts are cracked a little bit. Didnt even check after. Thanks for the heads up. Theyre being replaced anyways for the turbo project.
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  #11  
Old 01-24-2013, 01:39 AM
Reuvers Reuvers is offline
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In your other 2 reads people already gave you a heads up on vac leaks. Did you check everything with carb/brake cleaner to rule out vac leaks? Have you inspected ccv system ie dipstick test and oil filler cap suction?
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  #12  
Old 01-24-2013, 11:27 AM
iceman4169 iceman4169 is offline
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Yes all has been checked and is perfect. Did a smoke test. Theres a little bit of oil leaking at the bottom but my mechanic said its nothing major and is replacing all the seals for me anyways during the turbo project. Just wanted it to be running at its peak before I turbo it. Having over 100 more hp can cover up issues and if there is an issue, forced induction wont help it at all. Ive checked on everything still wondering why that message came up. Im going to drive it again today and see if it comes up again then immediately get the codes when it pops up. It beeps like 4 times then stays on the screen. Cel is on but isnt flashing so hopefully its something small.
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  #13  
Old 01-24-2013, 08:56 PM
ninetyseven1 ninetyseven1 is offline
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Quote:
Originally Posted by iceman4169 View Post
So the car has had massive loss of power and acceleration. It isnt right and gas mileage is completely down the drain. I pulled the codes and got these... P0170 and P0173. I havent gotten a clear answer to what they mean. But i have an idea its fuel trim bank 1 or 2? This morning I disconnected my MAF and my car felt alive again! Felt like i got like 75 hp difference i kid you not. Is this it? Is this only the MAF? Other possibilities I've heard can be pre cat o2 sensors. Someone have some input on this? I need a more knowledgeable on this please.
Those 2 codes mean , fuel banks 1 and 2. That's passenger side and driver's side both. What codes do you get once you unplug the MAF? Just a code P0100? Those p0170 and 73 codes are related to fuel trims. It is probably adding a crap load of fuel. most likely exceeding 25%. I would try another MAF sensor.
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  #14  
Old 01-25-2013, 01:53 AM
iceman4169 iceman4169 is offline
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Im yet to purchase my scanner. Everytime I get codes read i go to pep boys they do it for free. So, I'm yet to try it. I've already ordered the Botch one from bavauto. My car has about 100k and i do have a cone filter on there. Is there a possibility that ruined it? Anyways, new one coming in ill try it out. But ill unplug and get codes from pep boys again. Also should I change out those pre cat o2s?
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  #15  
Old 01-25-2013, 08:48 AM
ninetyseven1 ninetyseven1 is offline
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Originally Posted by iceman4169 View Post
Im yet to purchase my scanner. Everytime I get codes read i go to pep boys they do it for free. So, I'm yet to try it. I've already ordered the Botch one from bavauto. My car has about 100k and i do have a cone filter on there. Is there a possibility that ruined it? Anyways, new one coming in ill try it out. But ill unplug and get codes from pep boys again. Also should I change out those pre cat o2s?
It's probably not the o2's cause it is rare they both go bad on both banks(both sides) of the engine. Scan it with the MAF unplugged and then scan it with it plugged in. Make sure to clear the code before you plug it back in too. Then I suspect you are going to get the fuel trim codes again with it plugged in. The P0170 and 73.
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  #16  
Old 01-25-2013, 11:51 AM
iceman4169 iceman4169 is offline
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Sounds good Thank you for the advice ill try that immediately.
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  #17  
Old 01-25-2013, 12:21 PM
iceman4169 iceman4169 is offline
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Is there a possibility that this filter was the cause of the MAF going bad?
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  #18  
Old 01-25-2013, 02:16 PM
iceman4169 iceman4169 is offline
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Okay, so I unplugged the MAF and took it in and got the code p0170 only. The p0173 was gone
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  #19  
Old 01-26-2013, 10:02 AM
ninetyseven1 ninetyseven1 is offline
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Originally Posted by iceman4169 View Post
Okay, so I unplugged the MAF and took it in and got the code p0170 only. The p0173 was gone
Ok after you plugged it back in ,did you clear the codes or undo the neg. battery cable for a few min?
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  #20  
Old 01-26-2013, 10:07 AM
ninetyseven1 ninetyseven1 is offline
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If you did plug the MAF back in and DID undo the negative battery cable afterwards, and still got code P0173,then I am willing to bet that code P0170 is "pending". THat is how fuel trim codes work. IF this is the case in which you did really clear all codes and still got P0173,then I would definatley try another MAF sensor first before anything else cause you already had a smoke test and found no leaks.

Last edited by ninetyseven1; 01-26-2013 at 10:08 AM.
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  #21  
Old 01-26-2013, 01:15 PM
iceman4169 iceman4169 is offline
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Thank you very much I greatly appreciate the advice.
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  #22  
Old 01-31-2013, 01:49 PM
iceman4169 iceman4169 is offline
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Just wanted to check back and let everyone know the maf was replaced and WOWWWWW what a difference. I forget how much power these cars have. Really pulled me back in my seat. Thank you for the advice much appreciated.
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  #23  
Old 01-31-2013, 02:59 PM
Dackelone Dackelone is offline
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Quote:
Originally Posted by iceman4169 View Post
Alright guys. Craziest thing. Couldnt tell exactly because some of the leds are burned out. But im driving on the highway, and something pops up on the dash and beeps a lot. I think it was German? It said ( Gurt er legan ) What the heck was that!

Gurt er legan = put your seatbelt on! Really, thats what it means.

I had the same codes on my 535i V8. I also replaced the MAF and noticed a HUGE bump in power. My problem was the engine would missfire only on cold starts for the first two minutes, then it would be fine. Once I replaced the MAF my engine started and ran fine cold or hot.

Those other codes you are getting are the O2 sensors I believe. I replaced both o2 sensors and now my car feels 100% new. I found PnP Bosch o2 sensors on ebay for $44 each. Over here they wanted 200 euros each!!
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  #24  
Old 01-31-2013, 03:02 PM
iceman4169 iceman4169 is offline
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Great find! Ill look into replacing the o2 sensors as well. Im sure running rich for that long must have ruined something. Thank you very much for the translation
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  #25  
Old 01-31-2013, 03:10 PM
Dackelone Dackelone is offline
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Originally Posted by iceman4169 View Post
Great find! Ill look into replacing the o2 sensors as well. Im sure running rich for that long must have ruined something. Thank you very much for the translation
Ohh and btw... when I replaced my MAF a few weeks afterwards I also replaced that rubber L-shaped boot. Mine had a tiny crack and where the vacuum line attached it was also broken there. The boot wasn't cheap but well worth it in fixing my car.
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