I have a xc90 2.5t...2006. 215,000 miles... So this is it. 1 week ago I pulled a code for P0809. It's a fuel presssure regulator. So I was told to replace the sensor. Replaced with Bosch sensor. Then a day ago was traveling to Birmingham and could barely get home. Shutter...loss of power...felt fuel starved. Pulled codes. FPR sensor again. Plus three coils and random misfire. So replace 3 coils. Replaced FPR sensor again. Replaced spark plugs. Start it up and get a horrible wind noise on acceleration and pulled a new code. MAF P0101. Then I changed fuel filter. Got home and no codes. Still wind noise on acceleration. Then wife drives and she pulls the P0302. p0809. And P0101. So I am done. Finished. The only thing I can think of is a bad fuel pump. Please help.

 

Or the PEM.

 

Anyone???

 

Or the PEM.

 

Mine had engine shudder, turned out to PVC box. See thread on transmission, or mine. on starting my project. (not fully documented, cause there is so much out there. I have worn out motor mounts, and other things. but I think the biggest reason for the shudder is the oil in the intercooler is getting into the butterfly valve. Which is caused by a clogged oil trap.

I did have the worse case scenario. The oil was solidly dried out all the way down the bottom oil trap, into the engine, and all the to the bottom of the oil pan. If it (shuddering) is as bad as you say, the vacuum could have been bad enough to suck in the various o-rings. (cam shaft, rear main seal, turbo seal)