S40 1.8 2006 - PCV valve/hose replaced. Still issues

brunocar5 · Jan 23rd, 2019, 17:11

Hi all, my car recently failed MOT on emissions test and thought it might be the PCV valve, so went through the aweful job of replacing it and the hose.

The reason I thought it was the valve was because the engine is blowing out the oil filler cap - apparently a classic sign of the PCV.

Valve and hose replaced but still same problem, still burning oil. Is there anything else I could check, as I believe its still going to fail the emissions test.

Another thing to mention would be that, there is smoke coming out the exhaust gasket at the back of the engine when up to temperature. I bought a new cat and mounting kit, but don't want to put it on if the oil will ruin the new cat.

zork · Jan 23rd, 2019, 20:48

As far as I remember,the 1.8 engine is pron to worn piston rings...

wynandh6 · Apr 11th, 2024, 20:00

Quote:

Originally Posted by brunocar5

Hi all, my car recently failed MOT on emissions test and thought it might be the PCV valve, so went through the aweful job of replacing it and the hose.

The reason I thought it was the valve was because the engine is blowing out the oil filler cap - apparently a classic sign of the PCV.

Valve and hose replaced but still same problem, still burning oil. Is there anything else I could check, as I believe its still going to fail the emissions test.

Another thing to mention would be that, there is smoke coming out the exhaust gasket at the back of the engine when up to temperature. I bought a new cat and mounting kit, but don't want to put it on if the oil will ruin the new cat.

I'm experiencing the exact same issues and tried the exact same. Have you managed to resolve it?

Damoh89 · Apr 11th, 2024, 20:22

Smoke out of joint at gasket will definatly throw off emissions as will burning oil,try gasket on it and see and perhaps something like Lucas stop leak and maybe switch to grade heavier oil if it’s high mileage too?might scrape you by for another year,I’d successfully on e46 bmw with me oil filter and Lucas passed emissions so worth punt if can do it yourself for few quid and get another year or two out of it

Jan 23rd, 2019, 17:11	#1
brunocar5 New Member Last Online: Jun 12th, 2019 21:46 Join Date: Apr 2017 Location: Redditch	S40 1.8 2006 - PCV valve/hose replaced. Still issues Hi all, my car recently failed MOT on emissions test and thought it might be the PCV valve, so went through the aweful job of replacing it and the hose. The reason I thought it was the valve was because the engine is blowing out the oil filler cap - apparently a classic sign of the PCV. Valve and hose replaced but still same problem, still burning oil. Is there anything else I could check, as I believe its still going to fail the emissions test. Another thing to mention would be that, there is smoke coming out the exhaust gasket at the back of the engine when up to temperature. I bought a new cat and mounting kit, but don't want to put it on if the oil will ruin the new cat. Last edited by brunocar5; Jan 23rd, 2019 at 17:25.

Jan 23rd, 2019, 20:48	#2
zork Junior Member Last Online: Apr 20th, 2024 23:54 Join Date: Dec 2014 Location: Constanta	As far as I remember,the 1.8 engine is pron to worn piston rings...

Apr 11th, 2024, 20:22	#4
Damoh89 Member Last Online: Apr 23rd, 2024 12:41 Join Date: Nov 2022 Location: Dublin	Smoke out of joint at gasket will definatly throw off emissions as will burning oil,try gasket on it and see and perhaps something like Lucas stop leak and maybe switch to grade heavier oil if it’s high mileage too?might scrape you by for another year,I’d successfully on e46 bmw with me oil filter and Lucas passed emissions so worth punt if can do it yourself for few quid and get another year or two out of it

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