Ford Scorpio Forum - Print Page


    
      
        Ford Scorpio Forum
        (https://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl)
      

        General >> Problems >> Help Failed MOT
        
(Message started by: david1003 on Sep 9^th, 2010, 8:26pm)

Title: Help Failed MOT
Post by david1003 on Sep 9^th, 2010, 8:26pm

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.

Title: Re: Help Failed MOT
Post by scorpio_man on Sep 9^th, 2010, 9:00pm

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

Title: Re: Help Failed MOT
Post by david1003 on Sep 9^th, 2010, 9:12pm

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?

Title: Re: Help Failed MOT
Post by tlundkvi on Sep 10^th, 2010, 7:05am

on 09/09/10 at 21:12:46, david1003 wrote:

Do you remember how much oxygen there was in the exhaust in the test?

Title: Re: Help Failed MOT
Post by david1003 on Sep 11^th, 2010, 9:54am

on second fast idle test Lambda was 1.26

Title: Re: Help Failed MOT
Post by Matt on Sep 12^th, 2010, 6:04pm

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

Title: Re: Help Failed MOT
Post by david1003 on Sep 15^th, 2010, 3:48pm

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