Failed MOT help...

[Bfstrachan 10]

Just put the car through MOT. One of the fail points was "smoke level" the CO/HC/ idle were all pass. When I changed over my KR for the 9a, should I have put a cat into the exhaust system? Since the 2.0 16v all have them... Do I have something else that needs attention?

 

 

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[seanl82 23]

I didn't think it mattered what you have engine wise on a pre (March 91?) as it's before cats became a legal requirement in the UK. Worth googling and doing a bit of research into the subject though. What was the level recorded?

[Dox 23]

EMISSIONS HELP

 

CO high, co2 low hc high, o2 high - rich mixture with ignition misfire

 

CO high, co2 low hc high, o2 low -faulty thermostat or coolant sensor

 

CO low, co2 low hc low, o2 high - exhaust leak after cat

 

CO low, co2 high, hc low, o2 high - injector misfire, cat ok

 

CO high, co2 low, hc medium to low, o2 high - rich mixture

 

CO high, co2 high, hc high, o2 high - injector misfire, cat not working, combination of rich mixture and vacuum leak

 

CO low, co2 high, hc low, 02 low, good afr and cat operation- system normal .

lambda typical range 0.97 to 1.03 [ ideal lambda 1 ]

The emissions limits to be met are specified for both the fast and normal idle tests. At fast idle, CO must be at or less than 0.2%, HC at or less than 200 parts per million (ppm), and the lambda value(1) must be between 0.97 and 1.03. At normal idle, CO must be at or less than 0.3%.

[Dox 23]

 

 

 

 

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[Bfstrachan 10]

Thanks for the replies guys! It's a 1990 car. I have literally just done the conversion and turned the key. The timing is good, but I have done nothing as far as tuning etc. I kept the KR fuelling and management, but changed the cams from 9a to the KR ones.

 

 

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