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Bp5 misfire when hot??


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Looking for a bit of help.. 
 

I have a 2008 Subaru Legacy gtb bp5. 

I have a problem with a miss fire. It drives fine when it’s cold but when the engine gets warm at operating temp the missfire occurs. (Very rough idle) When on boost at around 4000rpm (wot) the car bucks, sputters and blows black smoke. I have a fault code for miss fire cyl 1..

 

With the engine running I can disconnect cylinder 1 coil and injector (not at same time)and it runs the same no change. 

Have checked:

Has spark 

Plugs okay swapped between cylinders 

coils okay swapped between cylinders 

coil connectors good 

swapped injectors between cylinders

no split hoses 

no boost Leaks 

fuel pump okay filter a bit dirty (will replace) 

Maf sensor swapped from a known good source 

timing okay 

turbo inlet pipe okay no splits 

Leak down test and compression test was good. 
vvti solenoids working, checked data and all are even 

All oil lines cleaned and filters removed 


Going to replace the fuel reg and tgvs with some spares i have. 

 

The only thing I can see which is out of the ordinary is the turbo. The vf44 has lots of in and out play and side to side play. I’m wondering if this could cause the issue? A bit weird though?  

 

Has anyone come across something similar to this before? 

 

Thanks in advance 

 

 

 

 

Engine Has done 112,000kms
 

 

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Turbo doesn't sound super happy, could have some dirty banjo bolt filters limiting oil flow. Failing turbo would be weird to only affect one cylinder though. 

You seem to have done just about every other test i’d do for similar symptoms. 

What part of the country are you in??

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