Beware!! MOT Problem - Don't throw away your standard cans
Discussion
Just got my Tuscan back from the garage after it passing it's M.O.T..
After being told by the Garage that the emissions were too high during it's first attempt, it subsequently passed when the original cans were put back on, in place of the Carbon Cans that had been fitted last summer.
It would appear that the change in the tail pipes was enough to make a significant enough difference to cause the problem.
According to the garage the testing equipment was suggesting a Lambda Sensor fault, which would have ended up being a major expense changing them, only to find they were not the problem.
Thankfully my wife hadn't thrown the old one's away when she found them in a corner of the garage a couple of weeks ago, and thought they were no longer required.
So if you are thinking of changing your cans, make sure you keep the old ones just in case you have the same problem.
Obviously, first job this weekend will be to reinstate the popping and banging items for another twelve months of fun
After being told by the Garage that the emissions were too high during it's first attempt, it subsequently passed when the original cans were put back on, in place of the Carbon Cans that had been fitted last summer.
It would appear that the change in the tail pipes was enough to make a significant enough difference to cause the problem.
According to the garage the testing equipment was suggesting a Lambda Sensor fault, which would have ended up being a major expense changing them, only to find they were not the problem.
Thankfully my wife hadn't thrown the old one's away when she found them in a corner of the garage a couple of weeks ago, and thought they were no longer required.
So if you are thinking of changing your cans, make sure you keep the old ones just in case you have the same problem.
Obviously, first job this weekend will be to reinstate the popping and banging items for another twelve months of fun
Mine flew through the last two MOT's without modification (de-cat & CCCs), and these were at different MOT stations.
This year however, the car failed the emissions on the fast idle check (different MOT place again), so had to have some catalysts put back on in order to pass.
I think the underlying message here is the need to find a sympathetic MOT station and stick with it.........
I can't for the life of me think why changing the end cans would affect the emissions though, as it's the same gas flowing through; albeit a little quieter!
This year however, the car failed the emissions on the fast idle check (different MOT place again), so had to have some catalysts put back on in order to pass.
I think the underlying message here is the need to find a sympathetic MOT station and stick with it.........
I can't for the life of me think why changing the end cans would affect the emissions though, as it's the same gas flowing through; albeit a little quieter!
The only reason I could come up with was that the original cans are baffled where as the CCC are sleeved. Would this make a difference. The popping and banging is 10x more with the CCC's in place. Doesn't this means more gasses exiting tailpipe. Don't know, I am no expert. I do know I would have been screwed if I hadn't kept the originals.
I've always wondered what people do with decatted cars too.
I've always wondered what people do with decatted cars too.
nelly1 said:
Mine flew through the last two MOT's without modification (de-cat & CCCs), and these were at different MOT stations.
This year however, the car failed the emissions on the fast idle check (different MOT place again), so had to have some catalysts put back on in order to pass.
I think the underlying message here is the need to find a sympathetic MOT station and stick with it.........
I can't for the life of me think why changing the end cans would affect the emissions though, as it's the same gas flowing through; albeit a little quieter!
This year however, the car failed the emissions on the fast idle check (different MOT place again), so had to have some catalysts put back on in order to pass.
I think the underlying message here is the need to find a sympathetic MOT station and stick with it.........
I can't for the life of me think why changing the end cans would affect the emissions though, as it's the same gas flowing through; albeit a little quieter!
It has been suggested that the mixture alters a little if the cats are removed or the cans changed as the exhaust is more free flowing. That might make the mixture a little weaker I guess, I think that increases NOX?
The cans have absolutely no effect on emissions. Things that will screw emissions up are bad Lambda probes and/or ECU, dodgy cats and a cool engine. The secret to getting a Tuscan through its emissions is to make sure the engine is good and hot for the test.
It’s almost a certainty that the second time you got the car tested the engine was hotter, hence passing the test. The fact that you'd put the original cans back on was just a coincidence.
Basically, anything from the cat back has no effect on emissions.
It’s almost a certainty that the second time you got the car tested the engine was hotter, hence passing the test. The fact that you'd put the original cans back on was just a coincidence.
Basically, anything from the cat back has no effect on emissions.
mine's at the garage at the moment, i'm not a happy bunny, Oct last year it failed on emissions. I took it back last week. Sorry sir the cats are buggered they need changing. Lots of swearing later plus i've got the funds(just) i agree for them to be changed. Next phone call. Sorry it's still failed on emissions. WTF!!. I've had the car since August last year and after this little episode which probably cost £1500+ (other work done as well) i would have have spent over 3500 grand on it. I must admit this really has dented my love affair with the car. Still i'm not going to get rid of it but i am waiting for the clutch/gearbox etc to give up the ghost. Oh well
Edited by fad sucker on Sunday 4th March 02:22
Sounds like your Lambda sensors (oxygen sensors) might be fooked. Did they get replaced along with the cats? Best get them function checked.
Tuscans can get through emissions without cats at all if everything is working properly (see above posts).
You can easily get replacement sensors (there's one per cat) and its a simple DIY job.
Tuscans can get through emissions without cats at all if everything is working properly (see above posts).
You can easily get replacement sensors (there's one per cat) and its a simple DIY job.
that's something i'll discuss with them, to be honest if they didn't check them first i'll be quite annoyed as i would have thought these should have been checked first seeing they're are easier to do. I have been thinking this but thought i'd wait and see what kind of replies i got and you DVS have come back with the reply i was expecting. If it turns out to be the ECU does anyone have any idea how much this will cost. I will be applying for a re mortgage very shortly
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