Author |
Topic: CO emissions (Read 1280 times) |
|
Pegasus
Full Member
24V Cosworth Ultima Born: Sept 97, sold Aug 23
Posts: 741
|
 |
CO emissions
« on: Nov 18th, 2012, 5:10pm » |
 Quote  Modify
|
Hi,
just had the Scorp MOT'd. Passed but saw that both the CO emissions have jumped and were close to upper limit 
Up till now they've barely registered so when I got home I investigated.
The air filter was last changed 17k ago - no problem really but I noticed that the little filter inside the air filter housing where the emissions return was soaked in oil - so much so that it had also accumulated in base of the air filter housing and about 1" of the air filter was also oily. I last checked this in April and it was all clean and never seen this before. Checked the tube at both ends and seemed clean and not dripping in oil (which is what I expected).
The only thing I've changed is using Mobil 1 5w/30 instead of the usual Magnatec 5w/30 in August but can't see that as a cause (though I notice that the rare rattle at start up hasn't occurred since).
Any idea what could have caused this - and possible remedy?
Paul
|
|
 IP Logged |
|
|
|
Scorpio
Full Member
Posts: 562
|
|
Re: CO emissions
« Reply #1 on: Nov 18th, 2012, 5:20pm » |
Quote Modify
|
An OBD scan may assist. Possible Lambda/02 sensor fault. I think a little oil in filter housing isn't unusual. On the start up rattle. Have you tried WOT, (Wide Open Throttle) on start up.
|
|
IP Logged |
|
|
|
Pegasus
Full Member
24V Cosworth Ultima Born: Sept 97, sold Aug 23
Posts: 741
|
|
Re: CO emissions
« Reply #2 on: Nov 18th, 2012, 10:27pm » |
Quote Modify
|
Hi Adam,
forgot to add: OBD shows no difference with previous scans - all pretty stable, no codes. But I haven't had a close look at the switching of the cats yet - the data seemed ok and I'll run the visual. I changed filter and cleaned MAF. Google produced some useful suggestions like this one. I'll keep an eye on it.
Rattle isn't a problem - it rarely rattled and now never. Tried WOT once - nearly cacked myself as engine fired up - never again.
Paul
|
|
IP Logged |
|
|
|
Mike H
Senior Member
Renault Clio
 
Posts: 2594
|
|
Re: CO emissions
« Reply #3 on: Nov 22nd, 2012, 9:31pm » |
Quote Modify
|
Never seen oil in my filter housing ~ might be a crankcase breather problem?
"High CO means too much fuel. Fuel can only come from three sources: the crankcase vapor control system"
"Excess crankcase vapour flow can be caused by an incorrect PCV valve"
|
|
IP Logged |
Mike H
|
|
|
gozz
Senior Member
Been around awhile
Posts: 3475
|
|
Re: CO emissions
« Reply #4 on: Nov 22nd, 2012, 9:50pm » |
Quote Modify
|
You don't say 
|
|
IP Logged |
|
|
|
Pegasus
Full Member
24V Cosworth Ultima Born: Sept 97, sold Aug 23
Posts: 741
|
|
Re: CO emissions - now with OBD codes.
« Reply #5 on: Dec 31st, 2012, 1:14pm » |
Quote Modify
|
Hi,
now got some codes P1131 & P1151 (1st ones ever!) - lean correction to both banks.
Possible vacuum leak (pipes or gaskets or the rubber collar connecting the offside manifold)
The hissing sound seems to be normal
Have replaced the PCV and the oil filler cap (oil blowing past it onto exhaust - smelly). Will have a root around the pipes tomorrow although they look ok and secure.
Paul
|
|
IP Logged |
|
|
|
Glyn
Full Member
Now an OAP ! 95 cossie and another !and a 12v
Posts: 584
|
|
Re: CO emissions - now with OBD codes
« Reply #6 on: Dec 31st, 2012, 8:13pm » |
Quote Modify
|
Had a similar problem which gave erratic idle-it was due to a crack in the plastic T piece in the vac tube behind the manifold (in front of the bulkhead) which took ages to find because it looked ok as the crack was on the rear side !
Glyn
|
|
IP Logged |
|
|
|
Pegasus
Full Member
24V Cosworth Ultima Born: Sept 97, sold Aug 23
Posts: 741
|
|
Re: CO emissions - now with OBD codes
« Reply #7 on: Jan 2nd, 2013, 11:05pm » |
Quote Modify
|
All vacuum pipes checked - all secure, no cracks.
Noticed the connector between the MAF and resonator had been knocked loose (easily done  ) and this caused the codes. Went for a drive with OBD running and no codes and all data looks good. So hopefully problem solved by either changing the PCV, the oil filler cap or both. Will have to go for a good run on motorway to confirm.
Paul
|
|
IP Logged |
|
|
|
Simmo
Administrator
I'm an OAP !
Posts: 5508
|
|
Re: CO emissions
« Reply #8 on: Jan 3rd, 2013, 7:15am » |
Quote Modify
|
Hopefully that's solved it Paul. Fingers crossed and Happy New Year. 
|
|
IP Logged |
Now I'm an OAP
|
|
|
|
Home
Help
Search
Members
Login
Reply
Send Topic
Print