CL55_Serge

Here is some history on the car, prior to the misfires.

2013 - install Speedriven ECU/TCU tune, no issues
2015 - install Speedriven Intercoolers with new tune - no issues
mid 2016 - late night got random misfire, CEL flashing while nder acceleration on the freeway, restart car and all ok

late 2016 - condition repeated itself a few times rarely

late 2016 - passenger coil pack completely fails, car doesn't start, engine codes say misfire on all passenger side cylinders, entire bank is gone

late 2016 - passenger side coil pack is rebuilt by v12icpack folks http://www.v12icpack.com/ - car immediately starts up with new coil pack. at this point I assume that was root cause of all my misfires

early 2017 - while engine is suspended for a broken motormount replacement, turbos are upgrade with the Speedriven rebuilt set with light weight impeller, catless downpipes with rear O2 sensors plugged into some de-faulers, new ECU tune from Speedriven for the new turbos.

after this, the problem becomes very repeatable very easy to simulate everytime high RPM is hit.

Any ideas on how to troubleshoot this? Including some pictures of data log, freeze frame and engine codes.

CL55_Serge

Update as of this AM - now it's always following cylinders 7 & 9, and it's happening at low RPM, tripped it at around 600 rpm twice this morning.

1ForcedBenz

If it repeats itself over and over since the turbo, it's the POS turbos Speedriven sold you is causing excessive preturbine back pressure. Easy way to find out if this is the cause is to loosen your waste gate rods way off. Like no preload and see what happens.

Could also be spark blow out, plugs, boots, coil not that healthy. But I'm assuming you've checked all that.

CL55_Serge

This is occurred before the turbo upgrade, but was very rare. Should I be at very high boost if my wastegates are working? I don't see above 20 using the OBDII apps. Manual gauge showed a spike at 20.5.

NRL

I'm getting PO Codes P309,P312 from a coil I never replaced, Driver side.
It's just starting, rare right now but I know how it degrades since I had a similar experience with the Passenger side Coil pack, that one got replaced.

I'm thinking of using the v12icpack folks and getting two rebuilt ones for the price of getting one brand new coil pack, so their installs are synced... maybe they can make it extra heavy duty somehow for tuned cars.

Did you get new red boots when you got the passenger side one from them?

CL55_Serge

Yes, Clark includes those when you do the purchase & core exchange.