# Short term trim not working ok

**URL:** <https://community.ecumaster.com/t/short-term-trim-not-working-ok/4735>\
**Category:** GENERAL\
**Created:** [November 13, 2025, 11:12am UTC](https://community.ecumaster.com/t/short-term-trim-not-working-ok/4735 "2025-11-13T11:12:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jean-Marie](https://avatars.discourse-cdn.com/v4/letter/j/a183cd/32.png) [@Jean-Marie](https://community.ecumaster.com/u/Jean-Marie)\
**Post date:** [November 13, 2025, 11:12am UTC](https://community.ecumaster.com/t/short-term-trim-not-working-ok/4735/1 "2025-11-13T11:12:34Z")

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I have problems with the short term trim.

It works erratically and the tune display is not showing the target lambda.

It stays on a fixed value of 1.2 lambda.

Someone an idea?

 ![Schermopname (8)](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/4/4efcfde2093ce6b75195035e6aa0c34de72fa95a.png)

[porsche 2.4.emub3](https://community.ecumaster.com/uploads/short-url/kbxaeFf3EUHIAG7uVTfwKmfLDlZ.emub3) (63.9 KB)

[20251112\_1636.emublog3](https://community.ecumaster.com/uploads/short-url/6EBuWJUwADroyhlt5lySObDgs5y.emublog3) (293.5 KB)

 ![Schermopname (8)](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/4/4efcfde2093ce6b75195035e6aa0c34de72fa95a.png)

[porsche 2.4.emub3](https://community.ecumaster.com/uploads/short-url/kbxaeFf3EUHIAG7uVTfwKmfLDlZ.emub3) (63.9 KB)

[20251112\_1636.emublog3](https://community.ecumaster.com/uploads/short-url/6EBuWJUwADroyhlt5lySObDgs5y.emublog3) (293.5 KB)

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<div class="post-metadata">

**Author:** ![MickyMcFinnigan](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mickymcfinnigan/32/113_2.png) [@MickyMcFinnigan](https://community.ecumaster.com/u/MickyMcFinnigan)\
**Post date:** [November 13, 2025, 3:19pm UTC](https://community.ecumaster.com/t/short-term-trim-not-working-ok/4735/2 "2025-11-13T15:19:20Z")

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I would say you need to start with your Acceleration enrichment settings. they are not correct. you are adding fuel at 0 tps rate. it seems to be playing havoc (for starters) with your fueling.

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/c/ca228414268d4096231d0699d06cad483d1883b6.png)

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<div class="post-metadata">

**Author:** ![Jean-Marie](https://avatars.discourse-cdn.com/v4/letter/j/a183cd/32.png) [@Jean-Marie](https://community.ecumaster.com/u/Jean-Marie)\
**Post date:** [November 14, 2025, 7:37am UTC](https://community.ecumaster.com/t/short-term-trim-not-working-ok/4735/3 "2025-11-14T07:37:55Z")

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Thanks, its my first setup with an ecu master. What are the best acceleration enrichment settings to start with? I’ts all a little bit confusing the first time..