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Topic: Help Failed MOT (Read 946 times) |
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david1003
Newbie
cossie lover
 
 
Posts: 16
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Help Failed MOT
« on: Sep 9th, 2010, 8:26pm » |
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My 1998 cossie failed its MOT today due to a high Lambda reading all other emission readings were very low. Anyone got any ideas what the problem could be? The engine was running very roughly at low idle something I had not heard before.
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Help Failed MOT
« Reply #1 on: Sep 9th, 2010, 9:00pm » |
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hi there
could be a faulty lambda sensor (there's 4 of them, but it'll be one of the front 2) or an air leak somewhere, but that should knock out your emissions.
hth
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david1003
Newbie
cossie lover
Posts: 16
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Re: Help Failed MOT
« Reply #2 on: Sep 9th, 2010, 9:12pm » |
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I had just had a new o/s cat fitted but guy doing test said that wouldn't affect the lean running of engine. He seemed to think it could possibly be an air leak as i had sensors replaced last year. if it is air leak where do i look?
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tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
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Re: Help Failed MOT
« Reply #3 on: Sep 10th, 2010, 7:05am » |
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on Sep 9th, 2010, 9:12pm, david1003 wrote:I had just had a new o/s cat fitted but guy doing test said that wouldn't affect the lean running of engine. He seemed to think it could possibly be an air leak as i had sensors replaced last year. if it is air leak where do i look?
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Do you remember how much oxygen there was in the exhaust in the test?
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david1003
Newbie
cossie lover
Posts: 16
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Re: Help Failed MOT
« Reply #4 on: Sep 11th, 2010, 9:54am » |
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on second fast idle test Lambda was 1.26
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Matt
Senior Member
Manual'd and a 4.0 in the making
Posts: 2816
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Re: Help Failed MOT
« Reply #5 on: Sep 12th, 2010, 6:04pm » |
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have you had any work done on the top of the engine? theres a very brittle plastic T piece that always snaps, if not try the 3 inlet rubber joining hoses on the manifold, ive know them to leak
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FDS2000 Scans - Birmingham
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david1003
Newbie
cossie lover
Posts: 16
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Re: Help Failed MOT
« Reply #6 on: Sep 15th, 2010, 3:48pm » |
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Garage couldn't find anything wrong and it passed lambda test on their machine so took it back for retest. And the bloody thing decided to empty contents of it's radiator all over his lovely clean MOT bay. So he failed it again as test wasn't completed. NOT MY DAY
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