Topic: How can you tell if your cat has died? (Read 2982 times)

Field Marshal Dr. Opti · « **Reply #15 on:** 01 October 2012, 15:42:21 »

Quote from: Kevin Wood on 01 October 2012, 15:29:20

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 · « **Reply #16 on:** 01 October 2012, 16:12:17 »

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 · « **Reply #17 on:** 01 October 2012, 16:25:36 »

Quote from: Marks DTM Calib on 01 October 2012, 16:12:17

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 · « **Reply #18 on:** 01 October 2012, 16:46:38 »

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 · « **Reply #19 on:** 01 October 2012, 16:52:21 »

Quote from: Opti on 01 October 2012, 16:25:36

Quote from: Marks DTM Calib on 01 October 2012, 16:12:17
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

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Author Topic: How can you tell if your cat has died? (Read 2982 times)

Field Marshal Dr. Opti

Re: How can you tell if your cat has died?

Marks DTM Calib

Re: How can you tell if your cat has died?

Field Marshal Dr. Opti

Re: How can you tell if your cat has died?

Kevin Wood

Re: How can you tell if your cat has died?

Marks DTM Calib

Re: How can you tell if your cat has died?