[witty]

Hi!

Recently ive been using e50 for a while (3-4 fillups) and recently I switched back to 93 for the winter. I replaced my spark plugs to ngk 2 step colder plugs and gapped them to .20. Now I'm getting mixture codes for 1 and bank 2, but nothing is looks abnormal in my pulls. AFR is at 14.7 on the dot. My STFT maxes out sometimes when accelerating at lower rpms. but when on wot afr is around +10 : -10.

[Bimmer_Bro]

Originally Posted by sliver 335

Hi!

Recently ive been using e50 for a while (3-4 fillups) and recently I switched back to 93 for the winter. I replaced my spark plugs to ngk 2 step colder plugs and gapped them to .20. Now I'm getting mixture codes for 1 and bank 2, but nothing is looks abnormal in my pulls. AFR is at 14.7 on the dot. My STFT maxes out sometimes when accelerating at lower rpms. but when on wot afr is around +10 : -10.

Are you on MHD version 10? Sounds Tune related if it's tripping both banks.
This would happen to me on mhd v10 when highway cruising up a long hill. The other maps I have no issue with.

[witty]

Originally Posted by Bimmer_Bro

Are you on MHD version 10? Sounds Tune related if it's tripping both banks.
This would happen to me on mhd v10 when highway cruising up a long hill. The other maps I have no issue with.

Can you look ast these two logs and if they look normal?
https://datazap.me/u/tochez/stop-and-start-crusing
https://datazap.me/u/tochez/93-v10-3rd?log=0&data=3-24

[Bimmer_Bro]

Originally Posted by sliver 335

Can you look ast these two logs and if they look normal?
https://datazap.me/u/tochez/stop-and-start-crusing
https://datazap.me/u/tochez/93-v10-3rd?log=0&data=3-24

Sorry I have no idea. It's hard to tell on a log like that.

[Saif2018]

Originally Posted by sliver 335

Can you look ast these two logs and if they look normal?
https://datazap.me/u/tochez/stop-and-start-crusing
https://datazap.me/u/tochez/93-v10-3rd?log=0&data=3-24

Your STFT are pretty high on the pull (second log) if your getting mixture codes on both banks it's probably tuning related. Flash V9 or V7 map and log again and check codes.

[Bimmer_Bro]

As mentioned I had the exact same issue with v10 93 map. It's the tune not your car.
I flashed to v7 93 and it's been running perfect since.

[witty]

Originally Posted by Bimmer_Bro

As mentioned I had the exact same issue with v10 93 map. It's the tune not your car.
I flashed to v7 93 and it's been running perfect since.

Jus flashed to v9 and having the same mixture codes. starting to have rough starts where rpm would be around 800 and then shoot up to 1.3-1.4k (although i think it's cause i reset adaptations, also cold outside around 50°f). After cold start the idle is completely fine around 650-680. Car feels perfectly fine otherwise. I don't hear misfires or anything. This issue occurred right after i swapped my plugs, went back to 93 after using e50. The mixture cold would only pop up on 1) cold starts 2) uphills 3) random cruising and 4) pulls. If i clear it during driivng it won't come back up.

[Bimmer_Bro]

Originally Posted by sliver 335

Jus flashed to v9 and having the same mixture codes. starting to have rough starts where rpm would be around 800 and then shoot up to 1.3-1.4k (although i think it's cause i reset adaptations, also cold outside around 50°f). After cold start the idle is completely fine around 650-680. Car feels perfectly fine otherwise. I don't hear misfires or anything. This issue occurred right after i swapped my plugs, went back to 93 after using e50. The mixture cold would only pop up on 1) cold starts 2) uphills 3) random cruising and 4) pulls. If i clear it during driivng it won't come back up.

Well to be honest you do not need 2 step cold plugs with 93 maps. I use the oem Bosch 3 prong on stage 2+93 without issue. Not sure if this is related or not tho.
If it's happening on all tunes it may be your oxygen sensors.
I had the mixture issue on 10 but never happens on 7.

[witty]

Originally Posted by Bimmer_Bro

Well to be honest you do not need 2 step cold plugs with 93 maps. I use the oem Bosch 3 prong on stage 2+93 without issue. Not sure if this is related or not tho.
If it's happening on all tunes it may be your oxygen sensors.
I had the mixture issue on 10 but never happens on 7.

I had them laying around from an old build and I was only assuming that there isn't a negative usage of using 2-step colder plugs on stage 2+ or is there? Other than that, I use the same OEM bosch ones before and It was running fine. Do I swap out the ngks back to bosch?

I had just replaced all my o2 sensors with the OEM bosch ones (all 2 upstream and downstream) and they all seem to be at .4 V respectively. I am guessing the NGK is causing this problem, but I had run ngk in all my builds so I am confused maybe I didn't gap them to .20 or something. Can mixture codes happen if they arent gapped correctly?

[Bimmer_Bro]

Originally Posted by sliver 335

I had them laying around from an old build and I was only assuming that there isn't a negative usage of using 2-step colder plugs on stage 2+ or is there? Other than that, I use the same OEM bosch ones before and It was running fine. Do I swap out the ngks back to bosch?

I had just replaced all my o2 sensors with the OEM bosch ones (all 2 upstream and downstream) and they all seem to be at .4 V respectively. I am guessing the NGK is causing this problem, but I had run ngk in all my builds so I am confused maybe I didn't gap them to .20 or something. Can mixture codes happen if they arent gapped correctly?

I have no idea to be honest. I would think more likely misfires or poor idle.
If you have some bosche kicking around it wouldn't hurt to swap to rule it out. Then you can focus elsewhere if still happening.

[Saif2018]

2 step colder plugs are for high powered Hybrid turbos, stage 2+ should be Bosch OEM ones or 1 step colder at most. Saying that it's worth physically checking for leaking injectors, wet plugs etc since it runs rough on cold starts.

[Jaronbwall]

+1 for the Bosch OEM 1 or 2 step colder, gapped to .22
When ever I see people discussing poor idle or misfire I usually think poor maintenance but in this case probably not.
Did you get the car running properly yet?

[witty]

Originally Posted by Jaronbwall

+1 for the Bosch OEM 1 or 2 step colder, gapped to .22
When ever I see people discussing poor idle or misfire I usually think poor maintenance but in this case probably not.
Did you get the car running properly yet?

awkwardly yes, but it only runs properly on a e50 tune for mhd, 93 gives me mixture control codes and its very weird. the 2 step colder are gapped to .22 already but its a really weird symptons.

[Jaronbwall]

Originally Posted by sliver 335

awkwardly yes, but it only runs properly on a e50 tune for mhd, 93 gives me mixture control codes and its very weird. the 2 step colder are gapped to .22 already but its a really weird symptons.

That's annoying I bet. I'd love to run mixed fuels (e30/e50, etc.) but I don't have the patience at the gas station. Plus road trips become a nightmare. Driving 6hrs to Asheville in a couple weeks.