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172 Cup Failed Emissions... Badly



  Renault Clio 172 Cup
Following up on my previous post (https://cliosport.net/threads/172-cup-massively-over-fuelling.850820/) I thought I'd check if you had any other ideas about what could be causing my emissions problems before getting it remapped. As you can see it failed on everything! I know it needed a new cat last year to get through the MoT before I bought it, so I'm expected it's got a cheap ebay special on it. But just a bad cat wouldn't cause the hydrocarbons to be that high? And similarly I don't think a bad map would cause the CO to be that bad unless I'm mistaken?

Occasionally my emissions light comes on, however only if the car is sat idling for a ~1 minute when it hasn't fully warmed up.

Thanks
 
  Renault Clio 172 Cup
Could an inlet gasket/seal leak cause emissions problems?
Certainly could, still wouldn't explain the hydrocarbons though I don't think (Although I realised I didn't upload the results so here they are)
20240922_115029.JPG
 

Matt Cup

ClioSport Club Member
  Leon Cupra
Was only wondering as I had took mine to Mick @Diamonds to be checked over and he said I had leaks from both upper and lower inlet manifolds and also the map and air temp sensors which the ECU was just about managing to keep within range.

I know very little about engines and emissions though.
 


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