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Fiesta-Si.com • View topic - MOT HELP exaust emissisons fail!
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southwestsi
PostPosted: Wed Mar 11, 2009 2:45 pm 
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car failed on these points. (carbon monoxide content after 2nd fast idle excessive)
(lambda reading after 2nd fast ilde outside limits) mot guy said they need to inspect it more using computer on ecu coz it might be fault with ecu.
The cat seems to be original and lambda, so cud this be the problem??
cant see a fault with ecu engine runs very smooth. help needed 2 weeks to sort this out thanks!! :) :)

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onslack
PostPosted: Wed Mar 11, 2009 3:07 pm 
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sorry about the bad news buddy, at least its nothing too serious tho!

before you start repacing bit imo i'd get it hooked up to the diag machine and have a look at what fault codes are showing up, dont want to be replacing bits willy nilly when they dont need to be replaced

other than that my first port of call would be the lambda sensor as that could be faulty

when was it last serviced?

what i use to do for mine was take my inlet pipe off and spray carb cleaner on and into my TB to clean all the black sute and crap off, might not do alot but every little bit helps :lol:

or it could be a sensor playing up causing it to over fuel
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southwestsi
 Post subject: ecu faults
PostPosted: Thu Mar 12, 2009 1:55 pm 
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failed on emissioins can there be a fault with ecu and wot commom problems can you get from ecu

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southwestsi
PostPosted: Thu Mar 12, 2009 2:01 pm 
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thanks for advice, im getting it plugged into diognostics 2moz morning £45. was looking on web for new cat and lambda sensor just incase i have to get that. found a sight that does brandnew cat for £50. and sensor for £30 so not to bad if i got to get that. my only worry is if its the ecu. but i dont get it the car idles fine drives smooth plenty of power so cant see a issue with that :)

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onslack
PostPosted: Thu Mar 12, 2009 2:08 pm 
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imo i think its either going to be the cat or your lambdad or both

i think i have my 1.6 ecu you can have for free, just cover the postage cost :thumbsup:

will look for it tongiht :D
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meilack
PostPosted: Thu Mar 12, 2009 2:10 pm 
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kind chap :)
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onslack
 Post subject: Re: ecu faults
PostPosted: Thu Mar 12, 2009 2:47 pm 
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southwestsi
PostPosted: Fri Mar 13, 2009 11:55 am 
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that is very kind of ya buddy, its at the garage now gettin checks done. if i need it il let u know in next few days ta :)

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onslack
PostPosted: Fri Mar 13, 2009 11:57 am 
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i had a look for it last night and couldn't find it, i think i sent it off a while ago to be butchered for my MS loom :cry:
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Dave G fsi
PostPosted: Fri Mar 13, 2009 7:44 pm 
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When my 1.1 mk3 failed an MOT on emissions, the garage put some engine cleaning stuff in it called forte and that sorted it. They said that any sort of petrol additive like redex, for example, would do the trick too. Put some in and give the car a burn along a motorway and it would clean the engine up, improving the emissions.

Also, as terry said, lambda sensor renewal also! 8-)

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karlthomas101
PostPosted: Fri Mar 13, 2009 11:35 pm 
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i had the same on my mot sheet as well as other thing's but funds ran out and now all i need to do is sort out the same problem as this could it be corsed because my MAF was blocked at the time and it was just cleaned out about 4 miles before the mot so could the ecu be over fuleing still corsing this?
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southwestsi
PostPosted: Sat Mar 14, 2009 10:52 pm 
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guy got results back from computer. came up as faulty lamda, so replacing that then havin a pre emissions check to see if its fixed. cud still be cat alswell find out monday :)

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onslack
PostPosted: Sat Mar 14, 2009 10:59 pm 
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:thumbsup:

hopefully fitting a new lambda will sort it out :D
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southwestsi
PostPosted: Thu Mar 19, 2009 8:43 am 
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Had the retest done with new lambda and it passed yee haa, i can breath for a year now. going to mock up a bit of straight pipe now to make decat might as well :thumbsup: :)

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onslack
PostPosted: Thu Mar 19, 2009 9:48 am 
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congrats buddy

glad it was an easy fix another year of happy motoring :chill:
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