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FIXED: Return of the P0171 and P0174 FIXED: Return of the P0171 and P0174
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  #281  
Old 09-10-2013, 11:48 AM
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Originally Posted by diddy0071 View Post
No, when the MAF is disconnected, it idles high for a second then runs normally, but if I press on the gas pedal, the symptoms I currently have return (acceleration issues, etc.) When I reconnect it, the engine stalls.
Interesting. Perhaps this is an indication there's a problem with an air / vacuum leak? I don't want to derail your current troubleshooting effort on the fuel system (as the video showing the low pressure reading at the fuel rail is interesting) but I would think you wouldn't see a change in behavior between having the MAF connected or disconnected. Or maybe I'm misunderstanding your description of the behavior.
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  #282  
Old 09-10-2013, 11:49 AM
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Originally Posted by sunny5280 View Post
Interesting. Perhaps this is an indication there's a problem with an air / vacuum leak? I don't want to derail your current troubleshooting effort on the fuel system (as the video showing the low pressure reading at the fuel rail is interesting) but I would think you wouldn't see a change in behavior between having the MAF connected or disconnected. Or maybe I'm misunderstanding your description of the behavior.

No your understanding is probably correct, and I have checked for any and all vacuum leaks.
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  #283  
Old 09-10-2013, 11:58 AM
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No your understanding is probably correct, and I have checked for any and all vacuum leaks.
Fair enough. Have you been able to measure the pressure at the fuel rail again with a fully charged battery? My apologies if I'm asking questions addressed in your latest videos.
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  #284  
Old 09-10-2013, 01:38 PM
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Originally Posted by diddy0071 View Post
A little video with the vehicle driving this morning, and thoughts on other things...

My car today - YouTube

If you haven't disconnected one of the temp sensors, then your focus is on the wrong stuff.
your temp in the video posted is ALWAYS in blue. And the vid is about 3 minutes long. My M54b30 engine has the temp dial a looong time in the middle after driving that long under those ambient temps.
There might be a combination of things: a bad temp sensor, and I think it's the dual temp sensor located on the engine - in the back, and after your long post with the scan - something fishy with the O2 sensors. But this might be due to a hot engine, which reports cold temps.
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  #285  
Old 09-10-2013, 02:39 PM
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The vacuum is attached, I made sure of it before putting everything back together. Where does that vacuum lead to? Is it one of the lines that is connected to the rubber boot at the intake (1 of 2 hoses?)
It connects to the top of the intake boot. The small vacuum F pipe.
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  #286  
Old 09-10-2013, 04:42 PM
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I am looking forward to the results of the drive home.

it is a good time to have a qualified BMW tech, up close and personal, a fresh set of eyes, weigh in. Realizing it would take more time/$$$, consider, if you are not, not telling the tech what you have done to attempt to correct the problem and let him start from just the symptoms so the troubleshooting is from base 1.

When will you be seeing the tech?

Do you want to do anything more between now and then?
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  #287  
Old 09-10-2013, 04:56 PM
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I am looking forward to the results of the drive home.

it is a good time to have a qualified BMW tech, up close and personal, a fresh set of eyes, weigh in. Realizing it would take more time/$$$, consider, if you are not, not telling the tech what you have done to attempt to correct the problem and let him start from just the symptoms so the troubleshooting is from base 1.
Yes...I just need someone to take a look at it and give me their diagnosis. IF they say fuel pump and/or fuel filter, I think I can confidently tell them that it probably isn't the case, since they are both BRAND new.

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When will you be seeing the tech?
I'm not sure, my friend was supposed to get into contact with him today and she would let me know when he can see me.

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Do you want to do anything more between now and then?
Probably drink...heavily.
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  #288  
Old 09-10-2013, 04:59 PM
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Probably drink...heavily.
LOL! Just watched the video and I think I found the problem: Your tail light is out!
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  #289  
Old 09-10-2013, 05:07 PM
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LOL! Just watched the video and I think I found the problem: Your tail light is out!
I hope you're kidding. The tail light just went out a few weeks ago.
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  #290  
Old 09-10-2013, 05:14 PM
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I hope you're kidding. The tail light just went out a few weeks ago.
Yes, I am kidding.
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