How can you tell if your cat has died?

[Field Marshal Dr. Opti]

I would expect with an ignition coil problem you'd get a misfire. If that were not corrected soon (and if it was only the leading / trailing plug it might not be that noticeable) you would get hydrocarbons passing into the cat in large quantities which would kill the cat, so that story is plausible, but I would expect the HC level to have been the problem at the MOT not the Lambda.

The Lambda value just indicates that, based on what the test machine is seeing coming out of the exhaust, the engine is running a little lean. This is just an estimate based on the exhaust gases after the cat, though, so could easily be upset by air leaking in. Alternatively, it may be that the engine is really running lean, which might well be down to a failing lambda sensor, air leak or some other metering issue. Live data would be required to dig much further than that, TBH.

The car starts and runs flawlessly. It effortlessly runs into the limiter at 9500 RPM.(Beeps at 8500rpm)without the slightest hint of a misfire.
Tested HC levels were 20 ppm. the maximum allowed is 200ppm.

[Marks DTM Calib]

Is it getting upto temperature ok?

Its as if its not going closed loop, live values would tell a story but not aware of a tool which can support that for the Mazda

[Field Marshal Dr. Opti]

Is it getting upto temperature ok?

Its as if its not going closed loop, live values would tell a story but not aware of a tool which can support that for the Mazda

Yes, Mark. The needle sits exactly where it should. Warms up pretty quickly,too.

[Kevin Wood]

If it's anything like the MX5 temperature gauge, though, it's driven by the ECU and bears little resemblance to the coolant temperature, sadly.

[Marks DTM Calib]

Is it getting upto temperature ok?

Its as if its not going closed loop, live values would tell a story but not aware of a tool which can support that for the Mazda

Yes, Mark. The needle sits exactly where it should. Warms up pretty quickly,too.

On a rotary engine, you amaze me