Soldato
- Joined
- 9 Dec 2009
- Posts
- 5,440
- Location
- Bristol
Just wondering if someone in the know could provide some info. My car passed its MOT last month, normally regarding emissions a pass is a pass as far as I'm concerned but I examined the emissions results this year and fear that I'm sailing extremely close to the wind with the CO natural idle test. According to the results sheet, the limit is below 0.30% and my car passed at 0.29%! I looked at the figures for last year and the car passed at 0.24%.
Does the MOT tester start the car up, inspect other parts of the car while the engine comes up to temperature, and then record the idle CO figures when the engine is warm enough to display a pass figure? Or is it the case that I could be running at over 0.290% CO constantly?
It's my understanding that high CO results from the engine running rich, but since a custom remap 3 years ago my economy has been great. I used to get low 30s mixed, high 30s on long journeys and high 20s when hooning. Since the remap I get mid 30s mixed, low 40s on long journeys and low 30s when hooning. Furthermore the tuner reduced the fuelling at idle by 25% when he was remapping to help with the economy.
Any comments will be much appreciated, cheers.
Does the MOT tester start the car up, inspect other parts of the car while the engine comes up to temperature, and then record the idle CO figures when the engine is warm enough to display a pass figure? Or is it the case that I could be running at over 0.290% CO constantly?
It's my understanding that high CO results from the engine running rich, but since a custom remap 3 years ago my economy has been great. I used to get low 30s mixed, high 30s on long journeys and high 20s when hooning. Since the remap I get mid 30s mixed, low 40s on long journeys and low 30s when hooning. Furthermore the tuner reduced the fuelling at idle by 25% when he was remapping to help with the economy.
Any comments will be much appreciated, cheers.
