Posted 22 January 2013 - 09:22 PM
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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
Posted 23 January 2013 - 04:38 AM
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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