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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > EGR Valve Adjustment....
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      05-11-2021, 07:23 AM   #1
DriveS
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EGR Valve Adjustment....

I have a new valve fitted and there is sometimes a slight hesitation on light acceleration.

I believe this is because the valve is not shutting soon enough in response to the accelerator requesting fuel, giving an air shortage. I did reset the adaptions in ISTA, which improved it a bit, but its still there.

There is a BMW service bulletin all about this and the solution is to adjust the fresh air balance in the EGR in ISTA to 40%.

In some older threads I read this could be done in ISTA, with some reporting the valve can be set to 70% on an F30 and results in a much improved initial take up. Hesitation gone.

I looked for the adjustment in ISTA+ and its not there. Apparently its been removed in the later versions.

Someone mentioned this could be done in Tool32.

Does anyone know if it can be done in Tool32 and how to do it OR another way to do it?

I may ring around some BMW specialists to see if they can do, if nobody knows........
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      05-13-2021, 03:42 PM   #2
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Bump, my new EGR valve is on the way, it this is news to me!
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      05-14-2021, 02:20 AM   #3
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This was the procedure in the older versions of ISTA

https://www.e90post.com/forums/showthread.php?t=1335039

And here is a bulletin from BMW... I think this is with DIS

Whilst cruising at higher speeds, typically on the motorway during constant throttle, there is an intermittent jolt like a misfire. the jolt / misfire / hesitation occurs once only.Typical speeds under which the complaint is present are; 1800 / 2000 rpm @ 60 / 70 mphDuring cruising, EGR regulation takes place;- typically when re-applying the accelerator pedal. The actual air consumed by the engine increases but the measured value (actual value from HFM) does not rise proportionally in order for favourable fuelling to take place, this is because the EGR is open and an element of unmetered air negatively effects the calculated. The engine hesitates briefly as a result.

In the event of complaint, carry out the following;
- Adjust the EGR, adjust rate of fresh calculated during EGR to +40
- To do this use the service function of the DDE, adjust it by adding the value 40
- End with programming the DDE using the option in the ABL
- Following successful manipulation, let the vehicle assume sleep mode and then check the status of the EGR by entering the test module once more to ensure the value has taken place before carrying out a thorough road test.

Carrying out the above procedure does not constitute a fault with the engine as the wear
characteristics of the engine and ancillaries may necessitate the need to adapt the DDE running parameters accordingly.

It should however, be noted that the air and fuel system should be fault free prior to
adopting such a change.
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      05-14-2021, 07:37 AM   #4
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What ilevel / update are you on the DDE? Some of the latest updates removed that adjustment completely.
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      05-15-2021, 06:56 AM   #5
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Quote:
Originally Posted by Enabled View Post
What ilevel / update are you on the DDE? Some of the latest updates removed that adjustment completely.
Would need to look, but as I could not see the option, I guess a version new enough to not have the option.

Would this mean it's not possible in ISTA or not possible at all. For example in Tool32?
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