Hi everyone,
I’m having recurring problems passing the emissions test with my Mini and was hoping someone might have some advice.
My engine setup is as follows:
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1310cc engine
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HIF44 carburettor
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Big valves head from minispares
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Evolution camshaft
The problem is that my CO₂ readings are consistently too low during the emissions test. I can easily adjust the CO values using the mixture screw on the carburettor, the engine runs fine at lamda 1 but no matter whether I set the CO to 1% or 3%, the CO₂ reading stays around 8–10%. The HC is around 1000
I need to achieve at least 11.5% CO₂ to pass the test.
Has anyone experienced a similar issue with this kind of engine setup? Plugs, are new and gapped. valve clearance is also perfect.
Could the camshaft, carburettor setup or ignition timing be responsible? Or should I be looking at something else?
Any advice or suggestions would be greatly appreciated!
Thanks in advance!
