My car failed its MOT last week on the emmisions. Both the hydrocarbons and co2 were both too high. I dont know the specific values, but apparently one of them needs to be at 1200, and it was at 2000
The general impression is that they are way to high!
My engine is a C16XE with TB's and Piper BP285 cams. Its obviously the overlap causing the hydrocarbons.
I had already adjusted the fuel map in preparation, from
750rpm - 4.0ms
1000rpm - 3.5ms
1250rpm - 2.9ms
750rpm - 2.8ms
1000rpm - 2.8ms
1250rpm - 2.3ms
I also changed the lambda target map from 14.0 afr to 14.7, and when lambda is on, its chucking in a lot of fuel. Im not too sure on the accuracy of the lambda values we have though.
With these changes it didnt idle as well and did stall a few times. I asked the guy at the mot place and he said it doesn't matter how well it runs, as long as it does.
Should I turn the lambda off and just try with the low values?
I wont be able to damage the engine just by leaning off the idle and low throttle/rpm values will I?
Is it worth making any changes to the ignition?
What sort of RPM will the test be done at?
What are my chances of getting this through the retest? I can take the laptop and adjust the fuel.
Anyone else had similar problems?