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#1 ppeter7

ppeter7

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  • Name: peter
  • Ford Model: mondeo 1.8/ mondeo 2.0 zetec
  • Year: 2001
  • Location: Devon

Posted 22 January 2013 - 09:22 PM

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

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#2 stef123

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  • Ford Model: Mondeo ST TDCI
  • Year: 2006
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Posted 22 January 2013 - 09:25 PM

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

#3 ppeter7

ppeter7

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  • Location: Devon

Posted 23 January 2013 - 04:38 AM

ok must be lambda as i had plugs done to at same time and all parts fitted was gen ford parts thanks again stef123

#4 stef123

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Posted 23 January 2013 - 07:10 AM

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.


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