2007 s80 3.2 misfire

[Barnmachinist]

Oks i dont know where to start. I got this car few months ago, i bought it broken. Dont remember correct dtc codes but the were misfire cylinder 4,5 and 6. And 1 more missfire code what i think meant misfire on every cylinder. Now i have worked on engine and almost everything is changed. First i out all new plugs and coils, no change. Fuel pressure sensor, nothing. I changed whole engine wit sensors etc to 100k kms driven ad still misfiring. Got injectors repaired and tested. Nothing. Only old things thats left is wiring harness, ecu and air mass meter. No vacuum leaks. 4,5 and 6 bank has melted cat but i got rid of all cats and i out them back when the engine is running good. Usually misfire is bad and i cant push gopedal not even tiny bit but when car is operating temp it runs ok but not good. Usually it works best at over 50% throttle and baddest is under that. Low rpms and mild accelarating is when it stutters and hesitates most. What the f**k i do next cheers. Car orginally has 290kms on odometer.

[MoVolvos]

Oks i dont know where to start. I got this car few months ago, i bought it broken. Dont remember correct dtc codes but the were misfire cylinder 4,5 and 6. And 1 more missfire code what i think meant misfire on every cylinder. Now i have worked on engine and almost everything is changed. First i out all new plugs and coils, no change. Fuel pressure sensor, nothing. I changed whole engine wit sensors etc to 100k kms driven ad still misfiring. Got injectors repaired and tested. Nothing. Only old things thats left is wiring harness, ecu and air mass meter. No vacuum leaks. 4,5 and 6 bank has melted cat but i got rid of all cats and i out them back when the engine is running good. Usually misfire is bad and i cant push gopedal not even tiny bit but when car is operating temp it runs ok but not good. Usually it works best at over 50% throttle and baddest is under that. Low rpms and mild accelarating is when it stutters and hesitates most. What the f**k i do next cheers. Car orginally has 290kms on odometer.

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Have you consider perhaps a worn or dirty ETM. Generic photos found online, clean vs dirty and sticky butterfly. Don't over spray or saturate the inside. Spray on a lint free clothe and rub without bending the butterfly pivot, shaft and plate. Clean behind everything as much as possible.
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ETM 2.png (911.39 KiB) Viewed 197 times

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[Barnmachinist]

Thats on my mind too because i used to play alot with those on older volvos with magneti marelli flaps but as i remember when i changed engine etm looked fine to my eyes, no dirt etc. Peehaps i have to look it