Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: SP_3.2 on 04 December 2007, 15:48:13
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Had the light back on the dash and had it checked out and told that the cat, s where showing low efficiency on bank 1 and 2. They then chack the emission at they where fine. Just to check it any one has had this before and if it could be the 02,s playing up as they seem to do on this 3.2 V6. The guy told me that the cats should be good for the life of the car and as it does 95% M way driving and not driven hard.
Any help please.
Thanks
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Ummm I may be wrong but I think that this belongs to the TECHNICAL Forum... :y you might get more help there...
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Had the light back on the dash and had it checked out and told that the cat, s where showing low efficiency on bank 1 and 2. They then chack the emission at they where fine. Just to check it any one has had this before and if it could be the 02,s playing up as they seem to do on this 3.2 V6. The guy told me that the cats should be good for the life of the car and as it does 95% M way driving and not driven hard.
Any help please.
Thanks
Yes, cats do die. If its ever had a misfire, they may well be shot. Then again, it could be lamdas...
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Had the light back on the dash and had it checked out and told that the cat, s where showing low efficiency on bank 1 and 2. They then chack the emission at they where fine. Just to check it any one has had this before and if it could be the 02,s playing up as they seem to do on this 3.2 V6. The guy told me that the cats should be good for the life of the car and as it does 95% M way driving and not driven hard.
Any help please.
Thanks
Yes, cats do die. If its ever had a misfire, they may well be shot. Then again, it could be lamdas...
Funny that they're saying both cats are playing up at the same time :-/ Makes me think something else might be throwing out the fuelling, especially as an emissions test shows it to be OK.
Kevin
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bad lambdas, spark plugs, DIS even oil additives can cook CATS ..
But when I de-cat , I examined inside and seems not very easy to clog or become bad :-/
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They dont die unless damaged......
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Or Mark leaves em in the water butt for too long ::)
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Car seems to run fine no missing and same MPG :-/
was thinking 02 as i think that i would be right in saying that the cats do not have a sensor in them. So i am thinking that the post and pre 02,s are the only way that they ecu would know how things are working with the cats.?
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Or Mark leaves em in the water butt for too long ::)
Is that how you tell whether they're punctured? :D
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Or Mark leaves em in the water butt for too long ::)
Is that how you tell whether they're punctured? :D
Its only a reliable indicator they've been caught crapping in his garden ;D
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Car seems to run fine no missing and same MPG :-/
was thinking 02 as i think that i would be right in saying that the cats do not have a sensor in them. So i am thinking that the post and pre 02,s are the only way that they ecu would know how things are working with the cats.?
The cat itself has nothing clever in it. It's just a honeycomb of materials which act as a catalyst in the breaking down of exhaust gases.
The pre-cat Lambda sensor is there to control the fuel mixture the engine burns. It provides the right conditions for the cat to work by controlling the engine's mixture to provide the right balance of gases in the exhaust. It's not affected by the cat and doesn't detect what the cat is doing.
The post-cat Lambda sensor is what aims to detect the cat's efficiency. It's there to ensure that the small amount of oxygen in the exhaust gas before the cat, is removed by the cat in the course of doing its' job. It also tells the engine management system when the cat starts working, so the engine management system can employ techniques to warm the cat more rapidly from cold.
The post cat Lambda sensor doesn't affect engine running, it's only there to ensure that an emissions failure resulting in the cat being ineffective is picked up by an EML. Ironically, these are less reliable than the cats they're monitoring. I suspect the exhaust gases are sufficiently cooled by the time they reach this part of the system that harmful deposits don't get burned off them (despite the fact that they have internal heaters so the sensor element actually operates red hot).
I guess you've got an issue with the post cat sensors (odd that they both misbehave at once, though) or that the emissions from the cats do go outside limits under some operating conditions for another reason (thus lighting the EML) but that the emissions are fine during MOT test conditions (idle and fast idle).
A few people with 3.2s have issues with these sensors. I have had the same once, when the contaminated fuel scare was on in february but it has not recurred. It would be interesting to get a tech2 on one of these cars and watch the live data to see what is going outside limits and when.
Kevin
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Thank,s Kevin
Thats a great write up and i am thinking the post 02 could be the prob, one has been replaced in the last few months.
Thanks
Steve.
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If you can get access to an ultrasonic cleaning bath, remove the sensors and give them a clean.....
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Hi
Would you know of anywhere that would do that.Or is there any other way of cleaning them,
Thanks :y
Steve.
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I keep meaning to buy one...they are only about 25 quid.
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I keep meaning to buy one...they are only about 25 quid.
Make sure it's the real McCoy. Emma bought a jewellery cleaner advertised on ebay as an ultrasonic cleaner, and it's got a motor in the bottom with an offset flywheel on it. Vibrates to bu66ery but not exactly ultrasonic, unless that motor revs higher than I think it does.... ::)
Kevin
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Had the light back on the dash and had it checked out and told that the cat, s where showing low efficiency on bank 1 and 2. They then chack the emission at they where fine. Just to check it any one has had this before and if it could be the 02,s playing up as they seem to do on this 3.2 V6. The guy told me that the cats should be good for the life of the car and as it does 95% M way driving and not driven hard.
Any help please.
Thanks
I guess it depends on the deemed life of the car according to the manufacturers... I suppose that 120k, for example, is the kinda expected life.... if fuel has been unburnt at some point (faulty O2 sensor/s) and gone onto the honeycomb matrix, it could have then ignited and shattered the matrix, it will become less efficient and usually smelly... Knocking them on a speed hump is a favorite too.........
DC
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Has the car been bump started at any time ::), because this will kill the cats with the wash of neat fuel throuh them :y
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HI
no not had any bump starts had the emmison tested at the weekend by the same place that did the MOT and he told me that they where fine. Told be that they could not be any better if the car was new.
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i have managed to kill both cats on mine due to running it with a knackered lambda, knock and crank sensor......poor car didn't know if it wanted a sh*t shave or a haircut at the time.....
they now rattle so badly you can hear them about 50 feet away, sounds like a skelenton have a *ank in a buscuit tin ;D ;D
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i have managed to kill both cats on mine due to running it with a knackered lambda, knock and crank sensor......poor car didn't know if it wanted a sh*t shave or a haircut at the time.....
they now rattle so badly you can hear them about 50 feet away, sounds like a skelenton have a *ank in a buscuit tin ;D ;D
;D ;D ;D
Very good !
Kevin
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Not sure, but somehow our cat is still alive (just) despite pissing on my coat the other day >:(