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General E46 Forum
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Old 05-06-2017, 07:02 PM   #61
se93
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Join Date: Oct 2007
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My Ride: BMW 328ci AW MTECH2
LTFT and MAF - Correct Levels?

Quote:
Originally Posted by jfoj View Post
Data = OBDII data. Freeze Frame and Logs.



What OBDII tool are you using?



We are spinning our wheels trying to extract data here.


OBD Fusion

Car has no codes so no freeze frame. Will get some logging done and send over


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Last edited by se93; 05-06-2017 at 07:02 PM.
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Old 05-06-2017, 07:09 PM   #62
jfoj
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My Ride: 330CiC, M5, X5, E93
Logs would be very helpful.

How old are the Pre-cat O2 sensors?
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 05-06-2017, 07:12 PM   #63
se93
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My Ride: BMW 328ci AW MTECH2
Quote:
Originally Posted by jfoj View Post
Logs would be very helpful.



How old are the Pre-cat O2 sensors?


I have never replaced them since i have been the owner


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Old 05-06-2017, 07:27 PM   #64
jfoj
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My Ride: 330CiC, M5, X5, E93
81,000 miles, this is a 328?

What year is this car?

Did the sit for a long time?
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 05-06-2017, 07:30 PM   #65
se93
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Join Date: Oct 2007
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My Ride: BMW 328ci AW MTECH2
LTFT and MAF - Correct Levels?

2000 328ci

I lived in Puerto Rico and bought the car about 10 years ago. Car had 51k when i purchased it. Spanking brand new

I moved to Texas and brought it with me

It was a show car and had very little use in Puerto Rico. Here in Texas its my daily driver now


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Last edited by se93; 05-06-2017 at 07:31 PM.
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Old 05-06-2017, 07:56 PM   #66
se93
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Join Date: Oct 2007
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My Ride: BMW 328ci AW MTECH2
Quote:
Originally Posted by jfoj View Post
Data = OBDII data. Freeze Frame and Logs.



What OBDII tool are you using?



We are spinning our wheels trying to extract data here.


Sent a number of files

Your PM is full


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Old 05-07-2017, 11:03 AM   #67
Archbid
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Quote:
Originally Posted by se93 View Post
Sent a number of files

Your PM is full


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Put the files on dropbox and post a shareable link here on the forum. Instructions in jfoj's guide
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Old 05-07-2017, 11:11 AM   #68
se93
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Join Date: Oct 2007
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My Ride: BMW 328ci AW MTECH2
LTFT and MAF

Quote:
Originally Posted by Archbid View Post
Put the files on dropbox and post a shareable link here on the forum. Instructions in jfoj's guide


Here is the dropbox link:

https://www.dropbox.com/sh/amg3e3pyr...gowmtQx8a?dl=0
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Old 05-07-2017, 05:40 PM   #69
se93
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My Ride: BMW 328ci AW MTECH2
LTFT and MAF - Correct Levels?

I Just picked up a fuel pressure gauge to measure pressure.

It does leak a bit in the connection between the gauge and hose but with the key on (not starting up) i see oressure goes up to about 50 and as fast as it rises y comes back down to 0.

I turn the car on and get around 50-55 psi from what i could see as i had to turn off the car to stop fuel from continuing to seep out. There is a leak on the fuel gauge but looks like there is a fuel system issue

Need to get some teflon tape to cover the gauge threads and retest


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Last edited by se93; 05-07-2017 at 05:55 PM.
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Old 05-07-2017, 07:22 PM   #70
se93
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My Ride: BMW 328ci AW MTECH2
I fixed the fuel pressure tester leak and tested fuel pressure with key on (engine not running, see pictures) and took a video with engine on and gradually accelerating to 3500rpm




This is fuel pressure with engine on @ idle


Engine on and gradually accelerated to 3500 rpm


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Old 05-07-2017, 07:51 PM   #71
jfoj
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My Ride: 330CiC, M5, X5, E93
Residual fuel pressure spec 20 minutes after engine has been shut off - Fuel pressure >3 bar or >43.51 PSI

If the residual fuel pressure drops below this, there is likely a check valve or injector leaking.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 05-07-2017, 09:23 PM   #72
se93
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Join Date: Oct 2007
Location: USA
Posts: 250
My Ride: BMW 328ci AW MTECH2
Quote:
Originally Posted by jfoj View Post
Residual fuel pressure spec 20 minutes after engine has been shut off - Fuel pressure >3 bar or >43.51 PSI



If the residual fuel pressure drops below this, there is likely a check valve or injector leaking.


Will an injector leak reveal fuel around the injector area or can this occur and not see any fuel leakage?

Should i worry about the fast rate in which fuel pressure decreases when engine is not running as seen in the previously posted pictures? Can this issue cause the high LTFT values? The check valve is part of the fuel pump itself, correct? Thus a bad check valve would require a new fuel pump. If that was the case, can we get a walbro fuel pump and mate it with the factory fuel pump housing assembly? Would this be a good, reliable alternative to not have to purchase the original fuel pump unit?




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