Jrsc k20a2 (HELP)

[dan199008]

So I've been having an issue with my jrsc k20a2 and I was wondering if anyone could help please,
I notice it more after accelerating and changing gear it sort of hesitates/missfires between 3500rpm and 4500rpm for a few seconds then clears, it happens at the same rpm every time so I'm clueless. changed plugs/coils tps is fine I just don't know where to start, I'll try upload a datalog because I have no idea what I'm looking for to be honest. If anyone could help I'd really appreciate it.

[Hondata]

Your o2 sensor is not working, so it is not possible to see what the lambda is.

[dan199008]

Is there any particular reason it would have been mapped that way? Thought I would have to run with a primary o2 sensor in working order

[dan199008]

Your o2 sensor is not working, so it is not possible to see what the lambda is.

Btw I'm in the uk so we are on narrow band I believe not wide band if that's makes a difference

[Spunkster]

What injectors are you using?

[dan199008]

What injectors are you using?

Rc650cc bud

[Spunkster]

Have you discussed this issue with your tuner?

[Hondata]

Btw I'm in the uk so we are on narrow band I believe not wide band if that's makes a difference

Ok. Then I'd suggest adding a wideband because they are not expensive and will tell you a lot about what is going on. Given the short term trim is +-15% I think the fuel tuning is off at cruise, and it is unknown under load without the wideband.