# Primary unexpected missing teeth when engine is warm **URL:** \ **Category:** EMU PRO\ **Created:** [January 4, 2026, 8:55pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016 "2026-01-04T20:55:02Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![paulwalsh2252909](https://avatars.discourse-cdn.com/v4/letter/p/dbc845/32.png) [@paulwalsh2252909](https://community.ecumaster.com/u/paulwalsh2252909)\ **Post date:** [January 4, 2026, 8:55pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/1 "2026-01-04T20:55:02Z")
Hi, got a k24 engine on a pro 8, it starts fine and idles absolutely fine everything perfect until oil temp gets anywhere between 76-77degrees then I get a primary unexpected missing tooth 11 and then engine dies. ---
**Author:** ![Jan\_Matlag\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jan_matlag_ecumaster/32/1466_2.png) [@Jan\_Matlag\_ECUMASTER](https://community.ecumaster.com/u/Jan_Matlag_ECUMASTER)\ **Post date:** [January 6, 2026, 2:31pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/2 "2026-01-06T14:31:59Z")
Sure, we can check what the cause of your issue. What is a primary trigger pattern - additiona tooth (N+1) or missing tooth (N-1 or N-2)? Could you please record and send us scope files of your engine under the following conditions: 1. During cranking 2. At idle when the engine is cold 3. At idle when the engine is warmer Additionally, a recording of the moment when the engine is dying would be very helpful. There is a **[Ctrl + Space]** shortcut that allows you to collect longer scope recordings. Please let us know if you have any questions. ---
**Author:** ![paulwalsh2252909](https://avatars.discourse-cdn.com/v4/letter/p/dbc845/32.png) [@paulwalsh2252909](https://community.ecumaster.com/u/paulwalsh2252909)\ **Post date:** [January 6, 2026, 7:57pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/3 "2026-01-06T19:57:35Z")
Thanks for getting back, the trigger wheel is 12+1. Yes I’ll get scope recording you requested. I have a log file of when the engine dies if that helps? Thanks again ---
**Author:** ![Jan\_Matlag\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jan_matlag_ecumaster/32/1466_2.png) [@Jan\_Matlag\_ECUMASTER](https://community.ecumaster.com/u/Jan_Matlag_ECUMASTER)\ **Post date:** [January 6, 2026, 9:41pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/4 "2026-01-06T21:41:21Z")
Yes, please also attach the log if you already have it. If you can capture these three scope files (1., 2., 3.), that would be a good to start. One more question: how often does the engine die? Is it consistent under the conditions you described in your post? If it is easy for you to capture the moment when it dies using a longer scope recording, that would be perfect, but it is not required. ---
**Author:** ![paulwalsh2252909](https://avatars.discourse-cdn.com/v4/letter/p/dbc845/32.png) [@paulwalsh2252909](https://community.ecumaster.com/u/paulwalsh2252909)\ **Post date:** [January 6, 2026, 9:53pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/5 "2026-01-06T21:53:25Z")
[Trigger error log.emuprolog](https://community.ecumaster.com/uploads/short-url/1py8Rc8IIER8ENo8t4ZEp9tDpVk.emuprolog) (580.6 KB) [Paul test 2.emupro](https://community.ecumaster.com/uploads/short-url/5R3DTjeVY3yXUQxHoTI0sOiXmvy.emupro) (33.9 KB) I’ve uploaded log and map if that helps Yes every time it’s the same, once oil gets to 76 shuts off and will not start at all, if I leave it 5 min it will start again run for a min until oil gets back to 76 then shuts off. ---
**Author:** ![paulwalsh2252909](https://avatars.discourse-cdn.com/v4/letter/p/dbc845/32.png) [@paulwalsh2252909](https://community.ecumaster.com/u/paulwalsh2252909)\ **Post date:** [January 7, 2026, 8:08pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/6 "2026-01-07T20:08:51Z")
hi, i have the log files you asked for [warm idle engine dies scope.emuproscp](https://community.ecumaster.com/uploads/short-url/vskfacgiI4F43tt4kbNXqRpyuwB.emuproscp) (293.1 KB) [Warm idle scope.emuproscp](https://community.ecumaster.com/uploads/short-url/o9wKjfWRedrfU7tZPKUJfJBZc4j.emuproscp) (3.3 KB) [Cold idle scope.emuproscp](https://community.ecumaster.com/uploads/short-url/63d2wViTQXOICGGn8eu3evbkI2b.emuproscp) (3.1 KB) [Cold cranking scope.emuproscp](https://community.ecumaster.com/uploads/short-url/cMgvx2LqDbGrgio9I3xhbLXcx7B.emuproscp) (3.2 KB) ---
**Author:** ![Jan\_Matlag\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jan_matlag_ecumaster/32/1466_2.png) [@Jan\_Matlag\_ECUMASTER](https://community.ecumaster.com/u/Jan_Matlag_ECUMASTER)\ **Post date:** [January 8, 2026, 5:09pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/7 "2026-01-08T17:09:18Z")
Thank you for providing all the scope files. We will analize and will get back to you in a few days. ---
**Author:** ![Jan\_Matlag\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/jan_matlag_ecumaster/32/1466_2.png) [@Jan\_Matlag\_ECUMASTER](https://community.ecumaster.com/u/Jan_Matlag_ECUMASTER)\ **Post date:** [January 10, 2026, 6:30pm UTC](https://community.ecumaster.com/t/primary-unexpected-missing-teeth-when-engine-is-warm/5016/8 "2026-01-10T18:30:05Z")
It’s an issue with the crankshaft signal (primary N+1). The signal is filtered too heavily. Please see the first screenshot, it’s from your longer scope file. One impulse is missing, and this is the root cause of the problem. Please reduce the filter setting (see the second screenshot below). This engine uses a Hall sensor, which is typically very low-noise, so even the “Filter = None” setting may work correctly. Please let us know which filter setting works best for your configuration. Red mark shows the missing impulse: ![image](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/2/28f8a9c8c36d4ffe2cedf124f04d8335d8e90dd4.png) * * * Please lower the Filter on the Primary Input: ![image](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/e/eaf60640047879c2d5fe23c1ba6ab44d9d3b438a.png)