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Old 11-26-2013, 07:05 PM   #1
ultraslan-ny
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Join Date: Apr 2013
Location: NY
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My Ride: 330xi
Need Help with Reading Live Data Values

Hello,

Can you experts look at the pictures of my live data and tell me if you see anything wrong?

I bought this tool just because you people made me!

Thank you.

03 330xi 131K A/T
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Last edited by ultraslan-ny; 11-26-2013 at 07:09 PM.
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Old 11-26-2013, 08:27 PM   #2
jfoj
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Temperate appears good.

Long Term Fuel Trims are higher than I would like to see, prefer to see them between 0% and +2.5%. Not high enough to trigger lean codes, but not where they really belong.

Ignition timing retarded quite a bit, not sure why and under that conditions you were driving the car. Would expect the ignition timing to be in the area of +10 to +15 degrees, but need to check a few other cars. Might be due to the IAT temps being a bit high as you were probably idling for a while?

Would be interest to see if the LTFT are still high at cruise 45-55 MPH?

Would also be curious where the ignition timing would end up during cruise as well.

Assume the next question is why are you fuel trims shifted?

Could be a lot of reasons, usually due to intake vacuum and/or crankcase air leaks, but with only these screen shots, not sure I can tell you this is the only issue.
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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; 11-26-2013 at 08:28 PM.
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Old 11-26-2013, 08:33 PM   #3
stuntin325
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Re: Need Help with Reading Live Data Values

Timing is retarded and your long term fuel trims are high, meaning your engine is running lean and the dme is trying to compensate for that I would say start off with the basics, check for clogged air filter, vacuum leaks, etc.

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Old 11-26-2013, 08:46 PM   #4
jfoj
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Quote:
Originally Posted by stuntin325 View Post
Timing is retarded and your long term fuel trims are high, meaning your engine is running lean and the dme is trying to compensate for that I would say start off with the basics, check for clogged air filter, vacuum leaks, etc.
The timing is likely being retarded more due to IAT than the fuel trims. Fuel trims are compensating for the fuel mixture being lean so this should be mostly a wash.

I am a bit more concerned there is an adaptation issue that is part of the problem.

More data is needed to determine what is really going on.

Could even be a soft fuel pump, fuel filter should be changed if the OP has never changed it. I say every 40k miles the filter should be changed based upon the "black scum".
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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 11-26-2013, 09:12 PM   #5
stuntin325
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Re: Need Help with Reading Live Data Values

OP we need your maintenance history

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Old 11-26-2013, 11:28 PM   #6
ultraslan-ny
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Quote:
Originally Posted by jfoj View Post
Long Term Fuel Trims are higher than I would like to see, prefer to see them between 0% and +2.5%. Not high enough to trigger lean codes, but not where they really belong.

Ignition timing retarded quite a bit, not sure why and under that conditions you were driving the car. Would expect the ignition timing to be in the area of +10 to +15 degrees, but need to check a few other cars. Might be due to the IAT temps being a bit high as you were probably idling for a while?

Would be interest to see if the LTFT are still high at cruise 45-55 MPH?

Would also be curious where the ignition timing would end up during cruise as well.

Assume the next question is why are you fuel trims shifted?

Could be a lot of reasons, usually due to intake vacuum and/or crankcase air leaks, but with only these screen shots, not sure I can tell you this is the only issue.
I will come back with the values at 55mph tomorrow, so we can compare.

The car was idling for a while after a heavy drive.

I doubt the fuel filter or pump was replaced before.

Quote:
Originally Posted by stuntin325 View Post
OP we need your maintenance history

Sent from my SPH-L710 using BimmerApp mobile app
Maintenance:

DISA checked and ring replaced.
MAF replaced.
Throttle Body cleaned.
Smoke test: the elbow boot and one of the little MAF hoses replaced. My mechanic actually said that the pressure is good. I think he only smoked it from the intake. Is that good enough or are there other places that we need to smoke-test?

Air filter seemed clean but I cleaned it once recently.
Spark plugs are brand new. I still had the originals apparently WOW.

The valve cover gasket is leaking just a bit. Enough to look dirty from bottom but nothing on floor.

Oil consumption is (Castrol Syntec 5W-40) around a quart every 3K.

Also, I dont know how to interpret this but when I push the gas pedal smoothly, I feel the engine shakes a bit and feels lean on the pedal. Just so tiny though. However when I push it hard, no problem at all.

Last edited by ultraslan-ny; 11-26-2013 at 11:29 PM.
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Old 11-27-2013, 03:13 AM   #7
jfoj
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If you still have your original MAF, hold onto it. We may be putting it back on the car.

What did the MAF cost and where did it come from and why was it replaced?

Definitely plan on a fuel filter replacement if you think it may never have been changed, long live the black scum!

You do not need to take a screen shot, but pay close attention to the ignition timing when you come to an idle and see what the intake air temperature is.

Again, baseline ignition timing should be closer to +15 degrees.

Also notice ignition timing when driving under light load, you should see about +20 to +25 degrees.

You can also record the OBD stream with that tool and even play it back, so it will allow you to pay more attention to the road and you can even try and record the part when you feel the engine shake. You could also choose to record the file in the CSV format so it can be exported and graphed with something like MS Excel. I prefer the CSV format as it gives you options for graph and you could send it to me for review.

But you also have an xi, so the shake may actually be a questionable front axle as well.

You mention a smoke test, not sure I would perform another one at this point, but usually I recommend the crankcase be smoke tested as well. Most shops do not do this because they do not understand why smoke testing the crankcase is important. Also smoke testing the exhaust can be helpful for some things as well.

One test you can do in the driveway is with the engine running, watching the STFT values, note/mental average them at idle, then while the engine is running, remove the oil fill cap and see where the STFT go and note these numbers. With your screen shots, you could use this to capture the data as well, note there is are are Min and Max fields next to the data, so if you note the Max value before and after you do this test, it may help capture the Max deviation. You only need the oil fill cap off long enough to look how high the STFT jump. Provide a screen shot or tell me the Max value the STFT jump to.
__________________
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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