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Old 09-05-2013, 08:39 AM   #1
figuej
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New P0174 Scenario -

I did some search to see if someone had a similar case but no luck. I have a 2001 330i with 170,000 miles and when the fuel level is down to an 1/8 of a tank, around 60 miles left then the code P0174 goes off.. erase and a minute later comes back again. I filled up the tank or at least half a tank and code never comes back until 60 miles left. Fuel Pump is not even a year old - fuel filter was changed this year -

So I have a lean issue with low fuel........... Any ideas???
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Old 09-05-2013, 09:34 AM   #2
Mango
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Low fuel might mean harder time delivering fuel. Your fuel pump could be in a soft mode failure (JFOJ's term). Either way, you need full professional maintenance. See my sig and get to work. GL!
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Old 09-05-2013, 10:34 AM   #3
jfoj
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Brush up on your search skills, P0174 is one of the most common reoccurring codes for these cars

Read the first 2 links below in my signature.

What are your Long Term Fuel Trim values at warm idle with a more than 1/4 tank of fuel?
What are your Long Term Fuel Trim values at warm idle when the CEL is triggered?
Post your Freeze Frame data for comment.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Last edited by jfoj; 09-05-2013 at 10:35 AM.
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Old 09-05-2013, 11:15 AM   #4
figuej
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Quote:
Originally Posted by jfoj View Post
Brush up on your search skills, P0174 is one of the most common reoccurring codes for these cars

Read the first 2 links below in my signature.

What are your Long Term Fuel Trim values at warm idle with a more than 1/4 tank of fuel?
What are your Long Term Fuel Trim values at warm idle when the CEL is triggered?
Post your Freeze Frame data for comment.
Yes - I know - I spend some time reading most of them but none looks like my case, Well at least I didn't see it that way. The car now is half a tank and since I have a display I could post the LTFT values today and wait a couple of days to post the ones when the CEL triggers.

Thanks... will keep in touch
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Old 09-05-2013, 11:19 AM   #5
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Freeze Frame info will also be helpful.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 09-05-2013, 08:11 PM   #6
figuej
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Quote:
Originally Posted by jfoj View Post
Brush up on your search skills, P0174 is one of the most common reoccurring codes for these cars

Read the first 2 links below in my signature.

What are your Long Term Fuel Trim values at warm idle with a more than 1/4 tank of fuel?
What are your Long Term Fuel Trim values at warm idle when the CEL is triggered?
Post your Freeze Frame data for comment.

ok - Long Term Fuel Trim at warm idle with half a tank = 11.72
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Old 09-05-2013, 08:23 PM   #7
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ok - Long Term Fuel Trim at warm idle with half a tank = 11.72
Too high, likely vacuum leak(s)?

There are trim values for Bank #1 & Bank #2.

Trims should be between 0% and +2.5%.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 09-05-2013, 08:56 PM   #8
figuej
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Too high, likely vacuum leak(s)?

There are trim values for Bank #1 & Bank #2.

Trims should be between 0% and +2.5%.
yes - both banks are the same value at idle - the short trim varies between negative and positive , mostly negative (again , this is at idle). The car right now shows no code of any kind with this values.
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Old 09-05-2013, 09:10 PM   #9
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Re: New P0174 Scenario -

This code just pop in my car yesterday along with p0171
Today i check my ccv hoses and found this i still have to trouble shoot the other code will plug obd scan to see if one of them went away.

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Old 09-05-2013, 09:31 PM   #10
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yes - both banks are the same value at idle - the short trim varies between negative and positive , mostly negative (again , this is at idle). The car right now shows no code of any kind with this values.
This is hard to determine remotely, BUT, if your LTFT values are all in the +11% range, but the STFT are more negative at idle. STFT will be shifting quite a bit, but lets say the STFT are typically negative 10% or higher negative values, then I may question the MAF.

There have been a lot of counterfeit MAF's on the market/ebay and we have seen a lot of problems mainly with the 330 with these bad MAF's and very high fuel trims, usually at cruise speed and not as much at idle, but it takes a long tome for the LTFT to drift back toward 0% once at idle.

Do not jump to buy a MAF yet, but do you know the history of your current MAF?
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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Old 09-05-2013, 09:49 PM   #11
figuej
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This is hard to determine remotely, BUT, if your LTFT values are all in the +11% range, but the STFT are more negative at idle. STFT will be shifting quite a bit, but lets say the STFT are typically negative 10% or higher negative values, then I may question the MAF.

There have been a lot of counterfeit MAF's on the market/ebay and we have seen a lot of problems mainly with the 330 with these bad MAF's and very high fuel trims, usually at cruise speed and not as much at idle, but it takes a long tome for the LTFT to drift back toward 0% once at idle.

Do not jump to buy a MAF yet, but do you know the history of your current MAF?
Its a VDO no older than a year - STFT at idle won't go more than -10 , its stays close to 0. I have the AFE air intake and when installed the car was running rich because of the intake. So I went to an Active Autowerke mechanic and load their performance program in my car , So I guess he changed parameters in order to balance the rich conditions the AFE will caused. But the new MAF was changed after the program was installed. I will run the car tomorrow with the trim display and see how they change. But I am more curious to see those numbers with the fuel tank almost empty.
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Old 09-05-2013, 10:06 PM   #12
jfoj
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Intake will not cause the car to run rich.

RARELY do cars run rich, most of the time any rich conditions are false.

See if you can find out what was tuned on the car, possibly something was changed that should not have been changed.
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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