[bundo]

Just tuned my car with MHD to run stage 2+ e30 and it now misfires anytime I go WOT in 3rd gear and so on. I’ve put new plugs and swapped around the coils to figure out what’s going on but nothing changes. If I switch to the 91 map it will still misfire just not as often.

[Sgop335]

Without log is hard to say.
Spark plug/ gap / coil can be issues. What plugs. / coils?

At higher boost, smaller gap is necessary to prevent spark blowout. Many use about 0.02 - 0.022” ngk plugs. Same w coils, eldor and delphi provide consistent voltage at high boost. Also it’s important to have a tight seal between coil and plug to eliminate any voltage leakage. Dielectric grease.
If it is not the above could be injector related or fuel pump.

[bundo]

I’ve got two different logs the first is where this misfire happens second one is on same tune but ran good

https://datazap.me/u/bundo/log-16438...og=0&data=3-20
https://datazap.me/u/bundo/91-stg2?l...ata=3-20-21-31

[bundo]

I also already have ngks at .22 getting new coils today

[Sgop335]

Originally Posted by bundo

I’ve got two different logs the first is where this misfire happens second one is on same tune but ran good

https://datazap.me/u/bundo/log-16438...og=0&data=3-20
https://datazap.me/u/bundo/91-stg2?l...ata=3-20-21-31

Seems fuel related.
The difference can be seen between the 2 logs. First off the rpm is so choppy. Notice the rail pressure is too low at boost. Could be hpfp pump.
Also bank 2 is at -34% so may be one or more injectors are dumping fuel. So could be the fuel injectors in bank 2...may be adaptations can be reset..
In the good log these issues are absent incl. good lamda recovery to 235.

[bundo]

Yeah that’s just what I don’t understand how they could be different on the same tune but I’ll test when I get the coils and see how that goes.

[ab987]

Probably disable burbles when you are diagnosing a fuel issue, they can look like leaky injectors