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Topic: mot faliure emissions (Read 1885 times) |
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python9
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1997 24v ghia saloon
 
Posts: 241
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mot faliure emissions
« on: Feb 25th, 2009, 1:56pm » |
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my 24v scorp failed its mot on emissions
fast idle test
speed 2750 3150 /min
co 0.3 %vol actual 0.49 fail
hc 200 ppm actual 25 pass
lambda 0.95 1.09 actual 1.05 pass
2nd fast idle test
2750 3150 /min
co 0.3 actual 0.50 fail
hc 200 ppm actual 24 ppm pass
lambda 0.95 1.09 actual 1.04 pass
natural idle test pass
speed 625 825 /min
co 0.5 %vol actual 0.5
has anyone any idea what the problem could be is it lambda sensor or a cat problem
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martin_rowe
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I love YaBB 1G - SP1!
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Re: mot faliure emissions
« Reply #1 on: Feb 25th, 2009, 4:27pm » |
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Looks like cat problem, mixture is good (llambda reading)
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python9
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1997 24v ghia saloon
Posts: 241
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Re: mot faliure emissions
« Reply #2 on: Feb 25th, 2009, 5:09pm » |
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how do i know which cat is at fault
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amigafan2003
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Re: mot faliure emissions
« Reply #3 on: Feb 26th, 2009, 8:04am » |
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Get an OBDII reader on it - the post cat O2 sensors are there purely to check that the cats are ok - if either cat is bust, it'll throw and OBD error.
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martin_rowe
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Re: mot faliure emissions
« Reply #4 on: Feb 26th, 2009, 8:40am » |
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Post cat sensors will show little variation in output voltage, if one is fluctuating that will be the side with the 'duff' cat.
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python9
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1997 24v ghia saloon
Posts: 241
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Re: mot faliure emissions
« Reply #5 on: Feb 26th, 2009, 10:47am » |
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how many pins are are on the obd 2 socket on the 24v scorpio 1997
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scorpio_man
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Ford Kuga awd
Posts: 5654
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Re: mot faliure emissions
« Reply #6 on: Feb 26th, 2009, 10:50am » |
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16
if you don't have access to an obd-2 reader, just use a multi meter on the rear lambda's.
as posted earlier, if your reading is jumping about (0.2-0.8volts), then that cat is faulty.
hth
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tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
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Re: mot faliure emissions
« Reply #7 on: Feb 26th, 2009, 11:44am » |
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on Feb 25th, 2009, 4:27pm, martin_rowe wrote:| Looks like cat problem, mixture is good (llambda reading) |
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Then on the other hand, the HC value is very good. Python, have you tried the motorway in 2nd gear? Cleaned the MAF? When mine failed MOT, I had 2 bad cats, but in addition there was a very dirty MAF, a vacuum leak and a failed injection temp sensor. Fixing those made the car produce a better lambda value, but emissions didn't change much. If I remember it right, the lambda value is independent of the working cats or not, so AFAIK bad front lambda sensors are not ruled out.
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Highlander
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Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
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Re: mot faliure emissions
« Reply #8 on: Feb 26th, 2009, 1:52pm » |
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John is the 24v still road legal?
If you bring it with you next weekend i'll scan it for you.
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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python9
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1997 24v ghia saloon
Posts: 241
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Re: mot faliure emissions
« Reply #9 on: Mar 1st, 2009, 9:09pm » |
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yes she is still road legal the mot does'nt run out till march 14th cheers stuart
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martin_rowe
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Re: mot faliure emissions
« Reply #10 on: Mar 2nd, 2009, 8:49am » |
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thought it had just failed ?. fail cancelles out previous pass.
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python9
Full Member
1997 24v ghia saloon
Posts: 241
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Re: mot faliure emissions
« Reply #11 on: Mar 2nd, 2009, 12:50pm » |
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not if it had more than 2weeks on it
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martin_rowe
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Re: mot faliure emissions
« Reply #12 on: Mar 2nd, 2009, 1:19pm » |
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sorry incorrect
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amigafan2003
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Re: mot faliure emissions
« Reply #13 on: Mar 3rd, 2009, 8:58am » |
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As not having a valid MOT is a document offence and not point endorsdable, an MOT failure does not invalidate a current MOT certificate that has yet to expire. So, to summarise, you couldn't be prosecuted for not having a current MOT (because you do!)
However, all failure items on an MOT do affect a cars road worthiness, so you could be prosecuted for driving an un-road worthy vehicle (remember, having an MOT is no guarantee the vehicle is road worthy).
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: mot faliure emissions
« Reply #14 on: Mar 3rd, 2009, 10:31pm » |
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Long time ago - before computerised MOT's, a mate of mine always used to drive 'old bangers' and put them in for an MOT every 6 months - on the grounds that if it failed and it was going to be expensive to fix, he could then sell the car on still with 6 months MOT !
Pretty sure a fail these days goes on the DVLA database to stop this kind of thing.
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD 
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Highlander
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Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
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Re: mot faliure emissions
« Reply #15 on: Mar 3rd, 2009, 11:06pm » |
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Interesting one this, I've done a little researching on it and this is a summary of what i found.
If your car fails an MOT while the old MOT is still valid.
If you repair the fault that failed it but dont get it retested
eg: it failed on a bald tyre and you replace the tyre at home.
Then you can still drive it on your old valid certificate until that expires.
BUT if you still drive it without fixing the fault that caused it to fail the MOT then you are knowingly driving a defective vehicle, you will have a valid MOT but you would be charged by the police as they can prove you knew it was defective. (it shows up on their ANPR as an MOT fail)!!
Also, your insurance company will gleefully invalidate your insurance in the event of an accident/claim for the same reason.
So... although you would probably need to meet one of our boys in blue on a really, really bad day to get yourself charged for high emissions the fact of the matter is if you have a bump you're not insured.. 
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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Highlander
Moderator
Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
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Re: mot faliure emissions
« Reply #16 on: Mar 9th, 2009, 10:04pm » |
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OS cat gone to heaven,
NS cat on life support but hanging on
Two new cats heading to Aberdeen soon i think
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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python9
Full Member
1997 24v ghia saloon
Posts: 241
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Re: mot faliure emissions
« Reply #17 on: Mar 10th, 2009, 8:45pm » |
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yep 2 on order now should arrive by thursday
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
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Re: mot faliure emissions
« Reply #18 on: Mar 10th, 2009, 10:03pm » |
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Which ones did you get and where did you get them John?
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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