Hi fellow Volvo fans. I'm the new owner of a used Volvo 2007 XC90 D5.

After removing the engine cover of the supposed well maintained machine, I have come across this mysterious black plastic bit hammering away to the rhythm of the engine vibration. Does somebody know what it is?



  • Swirl flaps!

    Your swirl flap arm is borked


    You have the part number handy?

  • Thanks so much @Philia_Bear !

    I've been trying to figure out the source of high crankcase pressure (smoke bellowing out of oil cap). Could it be the cause?

  • Looks like the swirl flap link arm is missing but that plastic part shouldn't be bouncing around so you'll probably need to replace the swirl flap assembly aswell.

    Swirl flaps wont cause high crankcase pressure though.

    Could be a blocked breather box

  • Thanks Timbo. I have seen many swirl flap blanking kits for sale for BMWs. Are there any significant drawbacks to block these airways?

  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.

    You may be thinking of EGR blank plates .

  • He is thinking swirl flaps

    I have swirl flap blanking plates on my BMW

    Doing it on the Volvo is harder because of the testing and sensoring that volvo use

    Easier to just pull the intake and replace the flaps

  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.

    Does removing them make power change either way?

  • I dont think its feasible to remove them on the volvos as they are fitted directly into the head vs the conventional manifold mounted swirl flaps.

    Convincing the ecu that they are still functioning is the hard part

Sign In or Register to comment.