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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 10-16-2019, 12:34 PM
R3jus R3jus is offline
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E39 528i same engine problem

So i changed both o2 sensors ( cost me 150euro ) changed all 6 spark plugs, did a lot of diagnostics AND STILL the same problem cylinder 6 misfire and p0173 and p0170, maybe i need to reset the ECU? Because i changed the o2 sensors today i didnt reset the computer check engine light still on, there are no vacuum leaks checked 3 times with smoke machine, checked all the ignition coils all seem to be working fine the problem happens only after a bit of driving ( the engine starts shaking when i push the gas ) checked the compresion in the cylinders also everything is okay, even checked the injectors they are all good, what could be the problem ? 528i 2000m, codes are cylinder 6 misfire, p0173 and p0170
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Old 10-16-2019, 03:52 PM
mohamedrani mohamedrani is offline
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maybe that helps :

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Last edited by mohamedrani; 10-16-2019 at 03:56 PM.
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Old 10-16-2019, 11:40 PM
R3jus R3jus is offline
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E39 528i engine problem

I'll see if thats the problem but if i had the cracked hoses wouldnt the engine always run bad? If the engine starts running bad and rough if i shut the engine off and turn it on again everything is fine again for like 10min
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Old 10-17-2019, 02:23 AM
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ok...
p0173 and p0170 (*lean bank one and two)

have absolutely nothing to do with the spark plugs.. or the o2 sensors

there is one of 2 things happening..

1 you have vacuum leak, you have un metered air entering the system after the maf (you can confirm this thru live data)
2 you have a bad maf

NOTHING you said indicates anything should have been done with the o2 or the spark plugs.. so hopefully you have not complicated the problem by adding more things

(*sorry 3 things)
3 lack of fuel
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Old 10-17-2019, 02:26 AM
R3jus R3jus is offline
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Originally Posted by Burning2nd View Post
ok...
p0173 and p0170 (*lean bank one and two)

have absolutely nothing to do with the spark plugs.. or the o2 sensors

there is one of 2 things happening..

1 you have vacuum leak, you have un metered air entering the system after the maf (you can confirm this thru live data)
2 you have a bad maf

NOTHING you said indicates anything should have been done with the o2 or the spark plugs.. so hopefully you have not complicated the problem by adding more things

(*sorry 3 things)
3 lack of fuel
What do you mean lack of fuel? Bad injectors or pump? So i checked for any vacuum leaks after the maf and there were none, so maybe its a bad MAF? But wouldnt the computer show that?
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Old 10-17-2019, 02:59 AM
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no the computer wound not just say "your maf is bad"

it doesn't not know that there is a calculation error If there is a calculation error

did you smoke check it?

lack of fuel could be a bad regulator

you need to confirm things,

fuel pressure.
o2 single
Maf single
live data
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Old 10-17-2019, 06:21 AM
R3jus R3jus is offline
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Originally Posted by Burning2nd View Post
no the computer wound not just say "your maf is bad"

it doesn't not know that there is a calculation error If there is a calculation error

did you smoke check it?

lack of fuel could be a bad regulator

you need to confirm things,

fuel pressure.
o2 single
Maf single
live data
Yes i did a smoke test, but i didnt see any vacuum leaks plus if it was a vacuum leak the rpm would drop everytime now the misfire happens on after a while
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Old 10-17-2019, 08:15 AM
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no... I had a vacuum leak for years and never had a idle problem... there are to many variables to be able to just blanket statement "this would happen"

test with a known good maf
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Old 10-17-2019, 08:27 AM
R3jus R3jus is offline
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Originally Posted by Burning2nd View Post
no... I had a vacuum leak for years and never had a idle problem... there are to many variables to be able to just blanket statement "this would happen"

test with a known good maf
I just got the p0170 and p0173 codes again but without a misfire so maybe it is a vacuum leak but the smoke machine didnt show any so where should i look?
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