07 S60 R…terrible issue

Browntaa472 · Post by **Browntaa472** » 12 Oct 2022, 18:30

car idles smooth and then will idle rough sometimes, it varies when hot or cold, terrible acceleration, loss of boost, backfires like crazy, at idle sometimes the boost gauge reads 0 psi when it’s supposed to be ~21 psi at idle…when I go into boost it tops out at 6 psi, should be at 16-17 psi

Post by **br0dy519** » 12 Oct 2022, 18:43

It sounds like you have a vacuum leak. I think the 2.5T only supposed get about 8psi of boost.. not familiar with R models.

MDK · Post by **MDK** » 13 Oct 2022, 06:33

Sounds like the boost controller could be going bad or a vacuum leak or both.. you need a smoker (leak detector)

Post by **erikv11** » 13 Oct 2022, 14:32

Along those lines this sounds a lot like an air induction pathway leak - check the big fat boost hoses for tears and where they clamp to the piping. The one up by the radiator often gets mushy with oil first.