ppeter7 Posted January 22, 2013 Share Posted January 22, 2013 Hi there i have a 2001 mk3 mondeo 1.8 duratec petrol.just gone in for mot and hc abit high infact a fail.now ive tried redex and engine flushes but still high,but how ever when i took off the air pipe from the airbox to throttle body it passes emissions no probthis car hasnt a maf fitted either has had new airfilter fuel filter has any1 any ideas regards pete Quote Link to comment Share on other sites More sharing options...
stef123 Posted January 22, 2013 Share Posted January 22, 2013 Hi there i have a 2001 mk3 mondeo 1.8 duratec petrol.just gone in for mot and hc abit high infact a fail.now ive tried redex and engine flushes but still high,but how ever when i took off the air pipe from the airbox to throttle body it passes emissions no probthis car hasnt a maf fitted either has had new airfilter fuel filter has any1 any ideas regards pete high hc emissions is caused by a rich fuel mixture. could be due to worn spark plugs not burning the fuel properly or a lambda sensor. removing the air intake pipe is kinda proving this as you are now allowing a completely unrestricted airflow which is probably balancing the mixture Quote Link to comment Share on other sites More sharing options...
ppeter7 Posted January 23, 2013 Author Share Posted January 23, 2013 ok must be lambda as i had plugs done to at same time and all parts fitted was gen ford parts thanks again stef123 Quote Link to comment Share on other sites More sharing options...
stef123 Posted January 23, 2013 Share Posted January 23, 2013 ok must be lambda as i had plugs done to at same time and all parts fitted was gen ford parts thanks again stef123 The lambda sensors can be checked with a live data scanner. The front lambda sensor is the one you need to look at, it should be switching fairly quickly. Quote Link to comment Share on other sites More sharing options...
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