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Author Topic: Cats  (Read 2874 times)

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CBH

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Cats
« on: 02 April 2009, 15:21:59 »
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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Timbuk

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Re: Cats
« Reply #1 on: 02 April 2009, 15:51:37 »
Im sure some guys breaking cars on here will have a pair
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Marks DTM Calib

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Re: Cats
« Reply #2 on: 02 April 2009, 16:01:06 »
Quote
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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CBH

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Re: Cats
« Reply #3 on: 02 April 2009, 16:12:58 »
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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CBH

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Re: Cats
« Reply #4 on: 02 April 2009, 17:08:37 »
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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bigtow

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Re: Cats
« Reply #5 on: 02 April 2009, 17:34:32 »
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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2001 MV6 3.2 manual been converted from 2.6 auto

Marks DTM Calib

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Re: Cats
« Reply #6 on: 02 April 2009, 17:56:56 »
Quote
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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TheBoy

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Re: Cats
« Reply #7 on: 02 April 2009, 18:00:35 »
How do they get lamda reading, always puzzled me....
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CBH

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Re: Cats
« Reply #8 on: 02 April 2009, 18:07:52 »
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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Marks DTM Calib

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Re: Cats
« Reply #9 on: 02 April 2009, 18:33:01 »
Quote
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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Marks DTM Calib

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Re: Cats
« Reply #10 on: 02 April 2009, 18:34:06 »
Right

1) Are there any fault codes stored?

2) is the air filter and breathers all nice and clear?
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CBH

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Re: Cats
« Reply #11 on: 02 April 2009, 18:47:00 »
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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Marks DTM Calib

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Re: Cats
« Reply #12 on: 02 April 2009, 18:48:21 »
Quote
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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CBH

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Re: Cats
« Reply #13 on: 02 April 2009, 18:52:42 »
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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Marks DTM Calib

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Re: Cats
« Reply #14 on: 02 April 2009, 18:54:57 »
Quote
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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