# Knock detection on flat shift

**URL:** <https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868>\
**Category:** V3 SOFTWARE\
**Created:** [December 4, 2024, 7:00am UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868 "2024-12-04T07:00:16Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Markel](https://avatars.discourse-cdn.com/v4/letter/m/d6d6ee/32.png) [@Markel](https://community.ecumaster.com/u/Markel)\
**Post date:** [December 4, 2024, 7:00am UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868/1 "2024-12-04T07:00:16Z")

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Good morning, is there a way to deactivate the knock detection during flat gear shifting?  
Thanks

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**Author:** ![Jadzwin\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jadzwin_ecumaster/32/28_2.png) [@Jadzwin\_ECUMASTER](https://community.ecumaster.com/u/Jadzwin_ECUMASTER)\
**Post date:** [December 4, 2024, 10:27am UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868/2 "2024-12-04T10:27:29Z")

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Knock ia always disabled when the spark or fuel cut is present.  
Ao it should be disable during flat shift. Do you have any particular problem with that ?

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**Author:** ![Markel](https://avatars.discourse-cdn.com/v4/letter/m/d6d6ee/32.png) [@Markel](https://community.ecumaster.com/u/Markel)\
**Post date:** [December 4, 2024, 12:11pm UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868/3 "2024-12-04T12:11:39Z")

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In my logs it doesn’t seem to turn off, voltaje spikes are detected on the knock sensor during gear shifting

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**Author:** ![Greg](https://avatars.discourse-cdn.com/v4/letter/g/71c47a/32.png) [@Greg](https://community.ecumaster.com/u/Greg)\
**Post date:** [December 4, 2024, 1:46pm UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868/4 "2024-12-04T13:46:57Z")

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reading is there i think but no action for retard and enrichment happening

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**Author:** ![Jadzwin\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jadzwin_ecumaster/32/28_2.png) [@Jadzwin\_ECUMASTER](https://community.ecumaster.com/u/Jadzwin_ECUMASTER)\
**Post date:** [December 4, 2024, 2:46pm UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868/5 "2024-12-04T14:46:38Z")

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You will see the spike as the knock system works all the time processing data from sensor.  
What is important for you is knock action.  
Make sure the parameter Fuel / Cut spark delay is set to 300-500ms.  
Then in the case of fuel / spark cut disable knock action for above time, prevent system of retarding the ignition.

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<div class="post-metadata">

**Author:** ![Markel](https://avatars.discourse-cdn.com/v4/letter/m/d6d6ee/32.png) [@Markel](https://community.ecumaster.com/u/Markel)\
**Post date:** [December 4, 2024, 3:01pm UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868/6 "2024-12-04T15:01:06Z")

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Thank you very much, I had it in 0ms

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**Author:** ![Jadzwin\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jadzwin_ecumaster/32/28_2.png) [@Jadzwin\_ECUMASTER](https://community.ecumaster.com/u/Jadzwin_ECUMASTER)\
**Post date:** [December 4, 2024, 3:01pm UTC](https://community.ecumaster.com/t/knock-detection-on-flat-shift/2868/7 "2024-12-04T15:01:23Z")

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I will change default value to 250ms