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Normal CO readings for a De-Cat 1990 SE

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Hi All,

Just had my 1990 Esprit Turbo SE in for it's MOT and the CO achieved, during the emissions test, was 1.2% at idle.

At a fast idle of  2300rpm it was 0.68%.

I was expecting it to me nearer the 3.5% limit, at idle, considering the usual rich running nature of these cars.

Does anyone think this is a little lean?

I'd be interested in CO data for other de-cat SE's .


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The fuel/air target for catalyst era cars is stoichiometric, aka 1.0 Lambda as I understand it. While 3.5 is acceptable for a carbureted engine there's no reason a timed, port injected EFI lump should not do better. Richness at idle is not pursued, rather it's accepted as an unavoidable symptom of the limitations inherent in the inlet system. Not exactly on point but offered FWIW.


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