V70 2.4T High Idle after head gasket job

[scot850]

Well we are all siting and hoping this is the final issue. The O' rings for the injectors are variable in aftermarket form. I was lucky the Ebay place in California I bought them from a few years back worked great.

Maybe try a little silicon grease on the rings when re-fitting as if they are dry they can pinch and tear.

Neil.

[aeg]

The service manual says to use petroleum jelly on the injector O-rings, not silicon grease.

[scot850]

I suggest you watch this video on use of vaseline/petroleum jelly on rubber 'O' rings:



Neil.

[volvolugnut]

I suggest you watch this video on use of vaseline/petroleum jelly on rubber 'O' rings:

Neil.

No video link found Neil.
I have always used vaseline, but suspect the video will show possible swelling on rubber.
volvolugnut

Video link now shown.

[scot850]

It actually says it degrades rubber making it porous. Now the one thing I would say is that fuel 'O' rings are made from a special rubber so may be more resistant to vaseline use. I grew up working on cars as a hobby, and vaseline was the go-to for fitting rubber parts that need a little persuasion to fit. Vaseline also is petroleum based so if any gets into the fuel system is will break down and flush through.

Neil.

[Maestrours]

IMG_20231030_175132.jpg (291.09 KiB) Viewed 277 times

Hello again,

So i changed the o-rings with vaseline (PS on Vida it says to put vaseline on the big o ring of the fuel pump and fuel sender so...).

On the photo you can see the ebay one on the left, bosch one on the right.

Idle is now at 844rpm exactly (i think oem value is 840?), and there is no leak anymore as when I put brake cleaner on the intake manifold it has no effect anymore !

Thanks to everyone who replied here

There is just one thing that still upsets me: seconds after an acceleration, I sti smell a hot/oil odor.
I thought it would disappear with this fix but it is still here. I just can smell it like 5 10 seconds, after I accelerate and turbo is working.

Does someone have ever experienced this ?

Again, thank you for your help, much appreciated.

[scot850]

Is your oil filler cap seal good? Is the oil pipe from the oil separator/PCV tank still attached on the top of the engine under the cover plate?

Check the oil cooler hoses on the back of the engine and the seals on the turbo oil feed lines.

It might be old oil burning off. Run it for a few days and see if it still is as bad.

Neil.

[Maestrours]

I replaced all the pcv system, and filler cap last week.
anyway, the smell is too sudden to be linked to just oil burning off: i smell it right after an acceleration, onlya few seconds, till the next acceleration. it is not a permanent smell, and if I pop the hood and look for it I will not smell this odor;
I just discovered that I don't have a heat shield on top of the turbo. Wonder if it can be linked.

[scot850]

So again, check the short rubber hose from the top of the turbo to the metal pipe that runs over the top of the motor. They can leak with age.
Sometimes tightening can reduce that. I would still check the oil cooler lines to the turbo at the back of the engine.

Missing the heat shield is not a good idea. They do rust around the mounting points and rattle. One of the holes has a anti-rattle spring on it.

That would deflect the oil smell downward, but there should not be a smell in the first place.

Neil.

[Maestrours]

I'm not sure of this rubber hose... To my knowledge there is no hose that comes from the turbo to the top of the engine and I just finished a head gasket job ! Where is it supposed to end ?