Misfire

[Juniors_Finest]

Hello all,

I’ve had the JB4 on my 2019 Stinger GT for about 15,000 miles now. Car is at 21,000. I haven’t ran into issues until recently. At high RPM, I’m getting misfires and loud pops from my exhaust.

I usually just run 93 octane.

- 15,000 miles on performance plugs
- Borla Catback
- BMS Intake

I’ve tried running it with tuner turned off and still having the issue at full throttle.

Today I wanted to log it, so I did on Map 1 and no issues. I tried Map 2 and it misfired in 1st & 2nd at top RPM again. I have attached the logs here.

Any help? @Terry@BMS

Thanks,

Steve

 

[Rodtheviking]

I'll say plugs, 15k is about max for "performance" plugs. Have you pulled codes yet to see what cylinder/s are misfiring?

 

[Juniors_Finest]

Interesting, I’m a newbie with vehicles and this is the first car I’ve ever modded. Do we have a link or best direction to go when purchasing a new set of plugs and what they should be gapped at? Previous ones were Densos at 22.

 

[Rodtheviking]

HKS or Denso 5347 plugs are your best choices, gapped at .022. Most of the KIA tuning supply companies will have both, choose your poison.

 

[Kazz]

Hopefully it's not a broken coil. Check for OBD2 codes to at least narrow down the cylinder if possible.