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Inquiry on few codes MAF and ECM?

Tiny
BHAMDOC1973
  • MEMBER
  • 2013 BMW X1
  • 4 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 93,000 MILES
I bought this car with a close to drained battery. She would barely run with a jump but I knew the battery was weak that is why it had a million code. Put a new one in and she fired up. Infe warm you would feel a very slight stumble in the rpm for half a sec then back to normal. All the codes I am attaching are hidden under pending. Not sure if these are from before or recent. Had them deleted and will wait till something come back. Do any of them relate to each other or tell a story or pinpoint to something specific?
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Tuesday, August 23rd, 2022 AT 4:20 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

The codes are likely tied together. It indicates low airflow as well as a rich fuel mixture. Are there any restrictions in the air box or inlet tube?

Also, have you checked the fuel pressure to confirm it isn't too high? If you haven't, that should be considered. Here is a link that you may find helpful:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Also, if you haven't already, you may want to service the MAF sensor and throttle body. The MAF is on the air intake. See pic 1.

Here are two links you may find helpful:

https://www.2carpros.com/articles/throttle-actuator-service

https://www.2carpros.com/articles/mass-air-flow-service

Let me know.

Joe

See pic below.
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Tuesday, August 23rd, 2022 AT 9:03 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,553 POSTS
Numbers.
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Saturday, August 27th, 2022 AT 7:26 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,553 POSTS
This is after the car got warm.
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Saturday, August 27th, 2022 AT 7:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

The trims are all over the place. In the second set of pics (warm) the STFT is okay, but the LTFT is indicating a rich mixture. Have you tried cleaning the MAF or servicing the TB?

Also, in the first pics, was that when the engine was first started cold? I noticed the ECT indicates 122 degrees, and the system is running in a closed loop. The +38% STFT is extreme. That indicates the ECM is dumping fuel due to a lean mixture, which is the opposite of what I would have expected. With your scan tools, watch oxygen sensor voltages to see where they are.

Here is a link that explains how to test one:

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

Try servicing the MAF to see if that changes thing. Also, after you service it, delete the codes prior to starting it. See if they return or if something different comes back.

Let me know.

Joe

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Saturday, August 27th, 2022 AT 7:00 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,553 POSTS
The first thing I did was clean the MAF. I removed the throttle, and it was very clean. First set was when car was cold, second when warm. I will send sole o2 numbers.
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Saturday, August 27th, 2022 AT 7:04 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Let me see how the oxygen sensors are responding. When scanning them, hit the throttle a few times so I can see how they respond.

Take care,

Joe
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Saturday, August 27th, 2022 AT 7:47 PM

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