99 S80 N/A - Oil in air intake & Emissions fail [Solved]

[rTiGd2]

Just removed the air intake to clean up the ETM (Is that the ETM on the left? I'm new to Volvo) and I've noticed that there was a fair amount of oil coating on the inside of the intake, coming from the small pipe (circled red, as is the location on the air intake it goes into.

Do I have an issue here? After all, I wouldn't think oil going into the throttle body seems that normal to me. It was a bit 'smokey' with the engine at idle (from this pipe)

I did try search through the forum a fair bit but as I've no idea what that pipe does, I was limited on what I could actually search for.

[Update] Someone believes it is the pipe from the oil trap. As it just failed on emissions (CO at 1.2 rather than 0.2, if I remember correctly) they also think this could be all, or part of the cause) - I've no idea quite frankly - All I know is the oil in the air intake and have now noticed oil around the dip stick tube. When I take the stick out with the engine idling, white smoke is indeed coming out.

Kindest regards,

Tig

[mikealder]

The pipe is indeed from the PCV oil trap, if the oil return duct from the catch tank is blocked the engine will be ingesting quite a bit of blow-by oil that should be going back to the sump, have a read of this write up https://www.matthewsvolvosite.com/forums ... =1&t=55413 which I detailed how to change the PCV system on my 2000 N/A V70 which has the same engine as yours, where in the UK are you? - Mike

[rTiGd2]

Today has certainly been a day of learning for me. I never even knew about the PCV existence, let alone knew what it did. I'm an embedded computer guy, I'm in my element in your ECU but reading your post has filled me with equal amounts of dread and adventure

That said, when we got the car it had a code for the front Lambda sensor heater. A garage replaced this (with a Bosch generic fit, it appears) and the light remained and was told it was probably because it required an ECU reset or lacked some logic that a genuine one had.. However, I fitted a Denso sensor myself today, no soldier required as it was a direct fit (perhaps they got the wiring wrong on the generic one?) and yet the light remained. An hour later took the car out and no lambda light for the first time ever!! Ok, it's an easy part to change and removing the air intake was probably more complex but it was a win.

So, I've rambled on. I suspect that this may have helped with the CO high emissions but from reading about the PCV I assume this isn't helping (or helping the engine.) So thank you so much for confirming this and I now wonder if I am brave enough to start stripping this beastly looking engine apart, given my only tools are most computing, plus some 18 piece Halfords set I bought today so I could use the Lambda socket I also got. Well, at least I have more Torx tools than most shall

I'm in Bristol (had forgotten to fill that in my profile, sorry about that.)

[mikealder]

If you can change your Lambda probe then you are more than capable of sorting the PCV out, it isn't difficult but bargain on around three hours (more if the oil drain port is blocked) - Once the inlet manifold is off the rest is easy - Lambda probe has probably sorted the emissions but I wouldn't leave the PCV alone until you know its clear and working correctly, the Denso probe is what your engine needed, the Bosch probes are for the Turbo models, Volvos don't like generic probes, the light on the dash will have extinguished on its own after a number of restarts without the same fault appearing, the fault code for the faulty probe will still be latched in the ECU but I wouldn't bother too much about that to be honest - Mike