Can i under fuel somehow?

1. mclovin9091 Infrequent Poster Joined: May 2011 Cambridge, dartford, glasgow Posts: 212 98 MK1 VTR

   #1 6th March 2012, 13:02

   Had the car for an MOT and failed on the emissions 0.150 over the 0.300 allowed on the fast idle tests.
   
   I have already replaced the cat but i dont think that will fix the problem as the tester said he thought it was running rich due to the smell.
   
   My question is: Is there anyway i can under fuel the car or get it back to the factory settings? Other than taking the battery off for an hour.
   
   Cheers
2. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #2 6th March 2012, 13:05

   Taking the battery off for an hour won't work. You could clear the ECU of it's fuel trim settings and see if that aids things. But really you need to looking at a solution rather and the bodge job.
   
   EDIT: tried changing the lambda?
3. mcjacko1987 Established Member Joined: Feb 2011 Rochdale Posts: 1896 mk2 saxo 1.4 furio in possi blue

   #3 6th March 2012, 13:14

   change lambda, new fuel filter, sparks, injectors. i had to do that when mine failed emissions. i also ended up with a missfire whilst doing the repairs and turned out to be coil pack so maybe worth adding to the list.
4. mclovin9091 Infrequent Poster Joined: May 2011 Cambridge, dartford, glasgow Posts: 212 98 MK1 VTR

   #4 6th March 2012, 15:36

   Is the EML not meant to come on if the lambdas knackered?
   
   Redex added to the shopping list lets hope not the coil pack.
   
   MK1 VTR by the way
5. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #5 6th March 2012, 18:31

   Not all ways. If the lambda has an offset rather than just spewing out garbage the ecu won't realise and therefore won't throw up a fault code. You can't rely on the elm light to tell you there's a problem.
6. citroen_saxo_vtr Saxperience Forum Bum Joined: Mar 2006 Norwich Posts: 2823 Vectra sri 2.6 v6

   #6 6th March 2012, 18:38

   Engine knackered? It could be various things, map sensor, air temp loads.
7. scottie_436 Regular Poster Joined: Sep 2008 Posts: 449

   #7 6th March 2012, 19:33

   ecu temp sensor will also make car run rich if its knackered
8. mclovin9091 Infrequent Poster Joined: May 2011 Cambridge, dartford, glasgow Posts: 212 98 MK1 VTR

   #8 6th March 2012, 21:33

   Fuck me! longer list
   
   Cheers for the (err) help, should keep me busy for a while.