Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: CBH on 02 April 2009, 15:21:59
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Hi
the 2.5 failed it's MOT on three things
1)Antiroll bar Drop link, not a problem I have to change these almost every year due to the speed bumps on the way to work.
2) Horn is to quite, may be a dirty connector or needs to be replaced.
3) Now the big one Emissions, I have being told the "Cat's" need replacing, as they have got old (They are said to last 100k miles and mine have done 200k)
The cheepest I have found for patten parts is about £90 each delivered.
But there are universal Cats avalible at about £35 each just cut the pipes and weld the unit in, has anyone tried using these on an Omega?
cbh
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Im sure some guys breaking cars on here will have a pair
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Hi
the 2.5 failed it's MOT on three things
1)Antiroll bar Drop link, not a problem I have to change these almost every year due to the speed bumps on the way to work.
2) Horn is to quite, may be a dirty connector or needs to be replaced.
3) Now the big one Emissions, I have being told the "Cat's" need replacing, as they have got old (They are said to last 100k miles and mine have done 200k)
The cheepest I have found for patten parts is about £90 each delivered.
But there are universal Cats avalible at about £35 each just cut the pipes and weld the unit in, has anyone tried using these on an Omega?
cbh
Post the emmisions results please.
Is the engine getting upto temp (i.e. the temp gauge above 90 degC)?
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Hi I will post the results as soon as I can find the bit of paper.
But from memory it was the value that should be 0.3 and mine was 0.45.
I know the MOT guy and he made sure everything was up to temp as it started off at 0.59 and when down as the cats heated up.
The engine runs well and the consumption has not changed over the last 20K miles at around 28 miles per gallon.
cbh
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Ok found the paperwork
Idle CO 0.18% passed (limit 0.5%)
Fast Idle CO 0.41 fail (limit 0.3)
Lamda 1.05 (limit 0.97 - 1.03)
What do you think do I cahnge the cats?
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Mine went down on lambda try putting optimax in it and some fuell cleaner and also check ther are no blows even the slightest my car had no center boxes and this thro the lamber out . Mine was .01 over the first time it failed
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Ok found the paperwork
Idle CO 0.18% passed (limit 0.5%)
Fast Idle CO 0.41 fail (limit 0.3)
Lamda 1.05 (limit 0.97 - 1.03)
What do you think do I cahnge the cats?
Does not sugdest cats.....the lambda is out!
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How do they get lamda reading, always puzzled me....
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My understanding is the Lamda is due to too much oxygen in the gases, main cause is air getting into the exhaust maybe a joint or hole.
The Lamda reading could be engine running lean but there are no other signs of this like plug colour.
The CO is due to the cats not turning it into CO2 hance the thinking change the cats.
but if you guys can suggest another cause please do, that why I belong to and love the OOF.
Thanks
cbh
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How do they get lamda reading, always puzzled me....
They look for the oxygen content in the exhaust.....the same as the Lambda sensor does.
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Right
1) Are there any fault codes stored?
2) is the air filter and breathers all nice and clear?
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I did a paperclip test a couple of weeks ago and there were no codes displayed.
The air filter was change about a year ago and the breathers where cleaned about 10k ago.
but the MAF takes care of the volume of the air into the engine and if the filter was blocked it would ajust the fuel to maintain the mixture?
cbh
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I did a paperclip test a couple of weeks ago and there were no codes displayed.
The air filter was change about a year ago and the breathers where cleaned about 10k ago.
but the MAF takes care of the volume of the air into the engine and if the filter was blocked it would ajust the fuel to maintain the mixture?
cbh
Yes but, it would pull additional fumes from the engine inlcuidng oil which often buggers the emission tests.
Ok, so is the engine coolant temp getting upto say 90-95 deg?
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Engine temp is correct 90 - 95 deg range.
So if I fit a new air filter and clean the beathers there maybe a chance the CO would drop into the pass band?
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Engine temp is correct 90 - 95 deg range.
So if I fit a new air filter and clean the beathers there maybe a chance the CO would drop into the pass band?
Not if they are already ok.....but I have to work ina logical order and not assume anything :y
The question will be, what is the ECU temp sensor thinking?
Any exhaust leaks?
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I understand there is a small leak where the NS Cat joins the middle box the system is new only put on last week,
but if this was fixed the message I am getting is that this would not explain the CO reading.
As my guy said he does not work on Omegas very much and on other cars this not not fix the problem.
What I am trying to get my head round is is there a number of small steps I can take and get a pass or pay around £200 for new cats and still not win.
all comments gratefully received.
cbh
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How do they get lamda reading, always puzzled me....
They look for the oxygen content in the exhaust.....the same as the Lambda sensor does.
Doh! Of course :-[
:y
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Any history of problems with the cambelt or tensioners?
High CO content in the exhaust combined with excess O2 in the exhaust does suggest that the cats have failed to oxidise the CO which could point to contaminated or damaged cats....or they could be being overwhelmed by some other fault.
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Mine have been overwhelmed by the fact that they bottom out on the top of my driveway,so it seems the innards of the cats are sitting in the centre boxes rattling like hell. :(
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Mark is
usually always right, but if you do need any cats I have a pair of timax ones for , only about 8 months old... I didn't like them though.
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When over to the garage last night and checked there are no fault codes stored all was ok no codes.
The guy is going to try a few things today to see it he can get the reading down to MOT pass, if not it's going to have to be the new cats.
Thanks for all the advice I will post what happens next
cbh
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.. but it failed on Lambda in addition to CO. Now, a new cat might resolve the CO issue but the Lambda reading is based on what the emissions tester thought was going into the cat - i.e. that the mixture control is incorrect.
The Lambda reading might be incorrect due to extra O2 being taken into your exhaust via the leak or it might be due to the mixture being incorrect (too lean in this case).
Either way, you may still have a problem with a new cat, and the new cat may go the same way if a mixture problem is not resolved.
I personally would resolve the exhaust leak and see if the Lambda improves. If not, find out why it's wrong. Once you've got it running with Lambda 1.0 and the CO is still out, then it's time to consider the cat.
Kevin
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Hi
Fix the small leak and the Lamda value was ok, CO still wrong.
Removed the air cleaner and the CO when all over the place but after half an hour the CO was steady at 0.22.
Put the air filter back in and value went to 0.24 and remained stable.
So fix the drop link and fitted a new horn and it passed the MOT this morning.
I had to borrow the wife's Scenic today to come to work, it made me think what a brilliant car the Omega is.
Thanks for all the advice
cbh