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      01-11-2020, 11:09 AM   #1
chris-w
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Running lean on two banks. and other errors report

I have been getting a CEL that most dealers simply turn off and it stays off for about a week then comes back. I am completely fed up with this behaviour as they are all telling me the car is fine.

I manage to download and get working a version of ISTA on my laptop and pull off a report re the errors I am seeing and was hoping someone might be able to help me decode what on earth is going on?

I recently replaced the rear drives side comfort door handle as it kept shorting out the fuse and it seemed to fix one issue but now I am seeing the front drivers side door handle is acting up!? I have noticed some weird behaviour re locking the car as well. I do not think the CEL is at all related to the door handle though which I know I can resolves myself.

See attached PDf of from ISTA. Any assistance would be greatly appreciated, im not a bad DIY'er and wouldn't mind trying to resolve this myself.!
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File Type: pdf M5F10errors.pdf (388.3 KB, 16 views)
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      01-11-2020, 12:25 PM   #2
Dwaynos
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Do you have aftermarket intakes?
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      01-11-2020, 03:05 PM   #3
chris-w
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Do you have aftermarket intakes?
As far as I am aware the car is completely stock.
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      01-11-2020, 04:10 PM   #4
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You need to be looking at live data. STFT and LTFT need to be monitored, aswell as your o2 sensor voltages. From here you can start to determine the cause of your lean condition.

I'd be inclined to try cleaning your MAFs before you start complicating things actually.
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      01-11-2020, 07:15 PM   #5
chris-w
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I removed both MAF sensors last week and cleaned them off with MAF sensor cleaner. They were spotless and it didnít seem to resolve the problem.

Iím pretty new to ista, regarding the live data I assume this should be done with the engine running. Iíll do a bit of reason on the Atif and give it a go tomorrow.

Thanks for the advice Iíll report back if I manage to get anything worthwhile !
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      01-11-2020, 09:55 PM   #6
Monteblueem5
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Check the Fuel injectors Make sure that the car has a Eu5 make sure the car calls for the injectors that in the car I had the same problem and it turns out the dealer
Put the wrong injectors I. So itís easy to check with
Insta
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      01-12-2020, 08:42 AM   #7
chris-w
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So after spending an hour on ISTA I cant for the life of me figure out where to get the details needed to diagnose the STFT and LTFT and or the o2 sensor voltages
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      01-12-2020, 09:19 AM   #8
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Quote:
Originally Posted by chris-w View Post
So after spending an hour on ISTA I cant for the life of me figure out where to get the details needed to diagnose the STFT and LTFT and or the o2 sensor voltages
I've never used ISTA personally so I couldn't help you. Once you do find these data pids you then need to determine whether or not the o2 sensors are telling the truth. To my knowledge a vacuum leak on these engines will not cause a lean condition. As mentioned It could be injector issues, it could also be fuel pressure issues. Does the car drive fine? any noticeable loss of power?
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      01-12-2020, 05:23 PM   #9
chris-w
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Quote:
Originally Posted by Dwaynos View Post
I've never used ISTA personally so I couldn't help you. Once you do find these data pids you then need to determine whether or not the o2 sensors are telling the truth. To my knowledge a vacuum leak on these engines will not cause a lean condition. As mentioned It could be injector issues, it could also be fuel pressure issues. Does the car drive fine? any noticeable loss of power?
Car seems to drive fine. As its currently got the CEL on I haven't been driving it hard at all. I was hoping that I might be able to see something of value on ISTA regarding fuel pressure and or certain sensors being vastly different from the one on the other bank.

As this error keeps returning on both banks and both DME's so I am starting to think it isn't one of the sensors on each side (that would be a crazy coincidence) it must be something that causes the condition on both banks at the same time? Pumps / vacuum etc?
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