Volvo 850 power loss under hard acceleration Topic is solved

Jaumme · Post by **Jaumme** » 07 Feb 2019, 12:56

Thank you clemens i will

Jaumme · Post by **Jaumme** » 08 Feb 2019, 01:37

I feel like boost goles Up ando then goles down a bit And remains a bit low, what can cause this?

Jaumme · Post by **Jaumme** » 08 Feb 2019, 01:45

I think my tcv is leaking a bit

Cookeh · Post by **Cookeh** » 08 Feb 2019, 02:04

Boost leak would cause that sort of thing. TCV is a good place to start, as you said. Also check the vac lines on the turbo housings - I had two split here just last month.

Post by **erikv11** » 08 Feb 2019, 08:55

Other very common causes of boost leak:
- the 20 year old hose on the IAC is cracked somewhere in it
- the 20 year old CBV diaphragm has hit the end of the road, too many flexes, look for actual holes (can see light through it) or lots of cracks where it flexes. Can be tested with a vacuum tester / brake bleeder.
- Intercooler path. So many hose/pipe junctions.

Jaumme · Post by **Jaumme** » 14 Feb 2019, 06:03

i did check all of that everything is ok, nothing leaking.
the boost is half way the white line every time till 5500 rpm then goes 3/4 white line.