[Miata] High CO

[Jerry and Ce]

> What does he mean, "lambda reading was fine"? That doesn't make a lot
> of sense.

No idea, Keith.
The MOT test is all computerised, they run the engine at idle and at a 
faster speed and the onscreen computer display shows the revs to use and the 
time to hold them, also the CO, HC, and NOx figures, coloured green (pass) 
or red (fail).

>If the sensor is failing, it will start to deliver lower
> voltage - which is a lean signal. The car will respond by adding more
> fuel until the signal comes back to where it should be. At that point,
> the lambda reading might be correct but the car will in fact be
> running rich.

He's probably aware but I'll mention when I go back.

> If the car has OBD-II, check the long term trim. Excessive long term
> trim is a sign of a persistent problem such as a failing sensor.

I don't know, it's a '95.


Thanks for the extra help.

Jerry