V70 T5 -07 28.000km - Jerky Acceleration Uphill

[Skillerns]

Originally Posted by olliecampbell

idle control valve. Sometimes called an idle air control valve. But having said that if your car is a diesel it won't have one...

Ah i see, unfortunately I don’t have one. I think it’s controlled by the electronic throttle body.

[mcfe]

Again, you should plug it in VIDA. And log a few parameters, especially MAF, MAP and trims.

Well trims you can check with your regular old OBD scanner as well.

Other possible sources: Brake booster seal, it is known to fail. Brake booster check valve, also known to fail. EVAP hoses that connect to the fuel tank, someone somewhere said it becomes brittle and crumbles effectively drawing just air instead of gas fumes, this air is unmetered and can throw the engine calculations.

[Skillerns]

Originally Posted by mcfe

Again, you should plug it in VIDA. And log a few parameters, especially MAF, MAP and trims.

Well trims you can check with your regular old OBD scanner as well.

Other possible sources: Brake booster seal, it is known to fail. Brake booster check valve, also known to fail. EVAP hoses that connect to the fuel tank, someone somewhere said it becomes brittle and crumbles effectively drawing just air instead of gas fumes, this air is unmetered and can throw the engine calculations.

I’ll see what I can do. There’s no specific way to make the faults appear on command, it happens irregularly. I’m actually going to fix a little hose that leaks fuel on full tank that is sitting right after the tank itself, maybe that has smth to do with it, but I’m waiting for parts so in spring that will be fixed.

Other than that I might try to find a Vida PC to check it for myself so I don’t have to spend thousands by a mechanic for perhaps no results.