COP vs. COP wasted spart setting questions

[nismoautoxr]

Here is the story. I got this 97 mazda miata that up untill now has been running well ...really well on a base MS3 with running wasted spark and batch injectors. I am about to switch the motor for a 03 model VVT engine so I bought an MS3X because I was just tired of reinventing the wheel for outputs and inputs . I wired spark ABCD by firing order as well as inj. ABCD also by firing order. ACDB was how I did it hopefully because lot of the writing was very hard to see on the harness that I bought . I bought a premade DIY autotune harness for the MS3X. When I finished the wiring I changed the tune accordingly to use the MS3X injector and spark outputs and selected COP and sequential injection and it acted as if it was running crosswired like the coils were firing at the wrong times . I can select COP wasted spark and it runs normally . What did I do wrong? Can you not run sequential on the 4G63 decoder ?

[CRSTune]

Here is the story. I got this 97 mazda miata that up untill now has been running well ...really well on a base MS3 with running wasted spark and batch injectors. I am about to switch the motor for a 03 model VVT engine so I bought an MS3X because I was just tired of reinventing the wheel for outputs and inputs . I wired spark ABCD by firing order as well as inj. ABCD also by firing order. ACDB was how I did it hopefully because lot of the writing was very hard to see on the harness that I bought . I bought a premade DIY autotune harness for the MS3X. When I finished the wiring I changed the tune accordingly to use the MS3X injector and spark outputs and selected COP and sequential injection and it acted as if it was running crosswired like the coils were firing at the wrong times . I can select COP wasted spark and it runs normally . What did I do wrong? Can you not run sequential on the 4G63 decoder ?

The firing order is 1-3-4-2 (A-B-C-D). Your outputs should therefore be A-D-B-C (1-2-3-4) for cylinder order, not A-C-D-B like you have it.

[billr]

Do you understand that the drivers always fire A-B-C-D? How are the coils wired?

A => cyl. 1
B => cyl. ?
C => cyl. ?
D => cyl. ?

[nismoautoxr]

My bad. I typed it out wrong. I did follow the 1342 order or at least I thought I did . I gotta go back and check the pinout with my dvom . Like I said. It was difficult to read the writing on the wires. I dont have a diagram telling what tracer colors are which on the diagram. It should be ACDB .

[nismoautoxr]

Do you understand that the drivers always fire A-B-C-D? How are the coils wired?

A => cyl. 1
B => cyl. ?
C => cyl. ?
D => cyl. ?

Yes

[nismoautoxr]

Here is the story. I got this 97 mazda miata that up untill now has been running well ...really well on a base MS3 with running wasted spark and batch injectors. I am about to switch the motor for a 03 model VVT engine so I bought an MS3X because I was just tired of reinventing the wheel for outputs and inputs . I wired spark ABCD by firing order as well as inj. ABCD also by firing order. ACDB was how I did it hopefully because lot of the writing was very hard to see on the harness that I bought . I bought a premade DIY autotune harness for the MS3X. When I finished the wiring I changed the tune accordingly to use the MS3X injector and spark outputs and selected COP and sequential injection and it acted as if it was running crosswired like the coils were firing at the wrong times . I can select COP wasted spark and it runs normally . What did I do wrong? Can you not run sequential on the 4G63 decoder ?

The firing order is 1-3-4-2 (A-B-C-D). Your outputs should therefore be A-D-B-C (1-2-3-4) for cylinder order, not A-C-D-B like you have it.

You actually typed your order out wrong too lol but.it should be acdb which is how I think / meant to wire it. I gotta go back and double.check the pinout on the db37 because its a premade harness.

[racingmini_mtl]

Here is the story. I got this 97 mazda miata that up untill now has been running well ...really well on a base MS3 with running wasted spark and batch injectors. I am about to switch the motor for a 03 model VVT engine so I bought an MS3X because I was just tired of reinventing the wheel for outputs and inputs . I wired spark ABCD by firing order as well as inj. ABCD also by firing order. ACDB was how I did it hopefully because lot of the writing was very hard to see on the harness that I bought . I bought a premade DIY autotune harness for the MS3X. When I finished the wiring I changed the tune accordingly to use the MS3X injector and spark outputs and selected COP and sequential injection and it acted as if it was running crosswired like the coils were firing at the wrong times . I can select COP wasted spark and it runs normally . What did I do wrong? Can you not run sequential on the 4G63 decoder ?

The firing order is 1-3-4-2 (A-B-C-D). Your outputs should therefore be A-D-B-C (1-2-3-4) for cylinder order, not A-C-D-B like you have it.

You actually typed your order out wrong too lol but.it should be acdb which is how I think / meant to wire it. I gotta go back and double.check the pinout on the db37 because its a premade harness.

No, his order is correct. You need to have output A go to cylinder 1,output B -> cyl 3, output C-> cyl 4 and output D -> cyl 2.

[CRSTune]

Here is the story. I got this 97 mazda miata that up untill now has been running well ...really well on a base MS3 with running wasted spark and batch injectors. I am about to switch the motor for a 03 model VVT engine so I bought an MS3X because I was just tired of reinventing the wheel for outputs and inputs . I wired spark ABCD by firing order as well as inj. ABCD also by firing order. ACDB was how I did it hopefully because lot of the writing was very hard to see on the harness that I bought . I bought a premade DIY autotune harness for the MS3X. When I finished the wiring I changed the tune accordingly to use the MS3X injector and spark outputs and selected COP and sequential injection and it acted as if it was running crosswired like the coils were firing at the wrong times . I can select COP wasted spark and it runs normally . What did I do wrong? Can you not run sequential on the 4G63 decoder ?

The firing order is 1-3-4-2 (A-B-C-D). Your outputs should therefore be A-D-B-C (1-2-3-4) for cylinder order, not A-C-D-B like you have it.

You actually typed your order out wrong too lol but.it should be acdb which is how I think / meant to wire it. I gotta go back and double.check the pinout on the db37 because its a premade harness.

I typed it exactly as I meant to type it.

MS always fires in alphabetical order. Output A is always the first to fire, output B is always the second to fire and etc. Knowing that, if you want cylinder 3 to fire second, you have to wire it to output B. The way you have it wired, you're still wired in actual cylinder order. You need to wire as below:

A => Cyl. 1
B => Cyl. 3
C => Cyl. 4
D => Cyl. 2

or to put it another way:

Cyl. 1 => A
Cyl. 2 => D
Cyl. 3 => B
Cyl. 4 => C

[nismoautoxr]

I knew that and still did it wrong dammit. What a bonehead move. That also means I screwed up the injector wiring as well . Back to the drawing board. Thanks for the help guys. I'm sure that will fix it .

[nismoautoxr]

turns out I didn't mess up as bad as I thought. I only mixed up spark B and D with each other. I wired the injectors correctly . Next time Ill check with an ohm meter. I guess I just thought the b was a d and vice versa lol. Thanks for the help. Sometimes its the obvious stuff that stumps me

[CRSTune]

turns out I didn't mess up as bad as I thought. I only mixed up spark B and D with each other. I wired the injectors correctly . Next time Ill check with an ohm meter. I guess I just thought the b was a d and vice versa lol. Thanks for the help. Sometimes its the obvious stuff that stumps me

Also explains why it ran in waste spark since B and D are 2 and 3.

[nismoautoxr]

yup. Thanks again.