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Annual catalytic converter replacement

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GlennyGills
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Annual catalytic converter replacement

Postby GlennyGills » Thu Apr 15, 2021 4:15 pm

Hi All,
Just about every year I have to fit a new cat converter due to high CO readings, but H/C and lambda readings are fine and within limits. So I thought I would start a thread to document things checked and the progress if any.. :sad:

When I got the car home I did an ECU code check with the LED.
I got codes 10, 14, 14, & 13.
Code 10 is air thermistor - tried cleaning connections and the MAF no improvement awaiting replacement MAF.
Code 14 is atmospheric pressure done by the ECU. I checked the ECU all dry & clean. Sprayed contact cleaner on connections - no change
Code 13 does not exist. This is an anomaly.

The car starts and runs fine.

To be continued. :-D
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GlennyGills
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Re: Annual catalytic converter replacement

Postby GlennyGills » Mon Apr 19, 2021 2:10 pm

I have been doing a bit of research and I am wondering about possible overfuelling. One website that sells cat convertors says that if H/C reading is above 55ppm then it is overfuelling and will kill the cat. My MOT exhaust readings are typically 55+ppm. I managed to find an old 2013 MOT sheet and saw 25 ppm. The lambda is normal in the MOT test results, which doesn't indicate to me that it is not running rich BUT at 55ppm H/C ???

Can I ask what reading other people get with their cars mk1 1.8's ?

I am going to fit a new oxygen sensor and a new coolant thermistor ASAP.
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GlennyGills
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Re: Annual catalytic converter replacement

Postby GlennyGills » Fri Apr 30, 2021 1:29 pm

Well I cleared the ECU. Fitted a replacement AFM and got the same 10, 14, 14,13 flashes for the LED. I have now ordered a MX5 Tech Diagnostic tester to see what that says. :sad:
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Re: Annual catalytic converter replacement

Postby GlennyGills » Fri May 07, 2021 4:28 pm

20BC4FE1-56EB-4B55-B324-9BFC919C2894.JPG
20BC4FE1-56EB-4B55-B324-9BFC919C2894.JPG (258.55 KiB) Viewed 3181 times
Well I splashed out on the MX5 Tech diagnostic tester.

When I plugged it in and ran the diagnostics, it shows only one fault. Barometric sensor.

So I guess the led flashes were misleading. :sad:

I understand the barometric sensor is in the ecu, so can’t be changed. No problem as I don’t live on Snowdon. :wink:

Will check the oxygen sensor later.

Anyway I now have a fancy new toy.
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blackyb
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Re: Annual catalytic converter replacement

Postby blackyb » Fri May 07, 2021 8:27 pm

I was never any good at counting flashes so that's why I bought the MX5Tech reader. Comes in handy as I service a couple of local mk1s for friends.

As for a barometric sensor, don't know MX5s could predict the weather as well.
1993 1.6 Eunos Roadster (gone)
1998 UK Mk 2 1.6 (gone)
2003 1.8 SVT Sport (shouldnt have sold it)
1991 1.6 Eunos Roadster with a bit of bling.

Life is a journey, best travelled topless in an MX5!!
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Re: Annual catalytic converter replacement

Postby GlennyGills » Sat May 08, 2021 10:30 am

blackyb wrote:As for a barometric sensor, don't know MX5s could predict the weather as well.


Some MX5s are good at weather. If the car is on the road, it is dry. If it is in the garage it is raining. :-D
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GlennyGills
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Re: Annual catalytic converter replacement

Postby GlennyGills » Sat May 08, 2021 10:31 am

If anyone local to Reading needs to get their car checked, we can arrange to meet if needed.
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Mazda Mender
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Re: Annual catalytic converter replacement

Postby Mazda Mender » Sat May 08, 2021 4:37 pm

GlennyGills wrote:If anyone local to Reading needs to get their car checked, we can arrange to meet if needed.

:bow-yellow: :handgestures-thumbup:
Great bit of kit.
Do you have a O2 sensor to test with?
M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 .
Mk 1 Eunos 90 1.6 soul red ..f/ build
MK 2.1/4 Blue V.S Roadster 1.8 99 ..
MK1 1.8 ,white import.. (Ashleighs)
MK1 1.6 yellow J ltd import.f/build
MK 1 1.8 black Tokyo Ltd..f/build


http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
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Re: Annual catalytic converter replacement

Postby GlennyGills » Sat May 08, 2021 9:10 pm

I bought a new one from Andrew and fitted it. Will test when I get chance.
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