# Coil assignment **URL:** \ **Category:** EMU PRO\ **Created:** [February 12, 2025, 6:19am UTC](https://community.ecumaster.com/t/coil-assignment/3186 "2025-02-12T06:19:47Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![sogarrd](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/sogarrd/32/1581_2.png) [@sogarrd](https://community.ecumaster.com/u/sogarrd)\ **Post date:** [February 12, 2025, 6:19am UTC](https://community.ecumaster.com/t/coil-assignment/3186/1 "2025-02-12T06:19:47Z")
Hi question about coil and injector assignment, for me it was natural to set it up in firing order 1342 but I have now looked in the forum at the different project maps and can see that there are several that are set up for 1to1-- 2 to 2-- 3 to 3 – 4 to 4, can’t find anything about it in the manual ![coil assignment pro](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/8/8c29a7309f5df46fcc69f9f0a39bbc0b63868f4d.png) ---
**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\ **Post date:** [February 12, 2025, 8:13am UTC](https://community.ecumaster.com/t/coil-assignment/3186/2 "2025-02-12T08:13:24Z")
It depends how you’ve wired it. The assignment allows you to change the outputs around (like a patch bay) if you made a wiring error. Sticking with cyl 1 = ign 1 etc is the simplest and the firing order under Engine parameters does the rest. Ignore the assignment under trailing spark unless its on a Rotary engine ---
**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:** [February 12, 2025, 10:04am UTC](https://community.ecumaster.com/t/coil-assignment/3186/3 "2025-02-12T10:04:27Z")
> [@FloorItGarage](#): > > Ignore the assignment under trailing spark unless its on a Rotary engine FYI, trialing sparks are also working for 4-stroke and 2-stroke engines from firmware 115.0 ---
**Author:** ![mkuklis\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mkuklis_ecumaster/32/104_2.png) [@mkuklis\_ECUMASTER](https://community.ecumaster.com/u/mkuklis_ECUMASTER)\ **Post date:** [February 12, 2025, 11:01am UTC](https://community.ecumaster.com/t/coil-assignment/3186/4 "2025-02-12T11:01:33Z")
Hi, I guess you are coming from setting up EMU Black/Classic? We changed the assignment method in PRO to make it more straightforward. You can, of course, achieve the same thing in multiple ways, but the basic method is as follows: 1. Wiring is direct - output 1 to cylinder 1, output 2 to cylinder 2, and so on. 2. Assignment reflects the wiring - output 1 to cylinder 1, output 2 to cylinder 2, and so on. 3. Setting the firing order in the “Engine / Cylinders” section. P.S. The trailing spark is used for rotary or twin-spark engines. Your assignment of trailing spark doesn’t make sense, so if you don’t have one of the systems mentioned before, don’t assign trailing spark outputs. ---
**Author:** ![sogarrd](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/sogarrd/32/1581_2.png) [@sogarrd](https://community.ecumaster.com/u/sogarrd)\ **Post date:** [February 13, 2025, 6:06pm UTC](https://community.ecumaster.com/t/coil-assignment/3186/5 "2025-02-13T18:06:07Z")
Thanks for the nice explanation 😀 ---
**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\ **Post date:** [February 15, 2025, 8:29am UTC](https://community.ecumaster.com/t/coil-assignment/3186/6 "2025-02-15T08:29:34Z")
This is good to know. And I didn’t choose my words carefully enough there. “don’t assign when not using” should have been how I stated that lol