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[Marks DTM Calib]

I may have access to a rotabroach that should make drilling of lambda holes in the future easier (not that I am volunteering to do them  )

[Kevin Wood]

Anyone tried spark plug anti-foulers?

If not, I will be doing so shortly. Might be an easier alternative to installing additional lambda bosses if it works...

http://forums.evolutionm.net/evo-how-requests-questions-tips/114931-how-install-spark-plug-anti-foulers-remove-ses-cel-light.html


Kevin

[aaronjb]

Anyone tried spark plug anti-foulers?

No, but I've seen the results of trying to drill them out to accept the O2 sensor with a blunt drill bit.. (blue, mangled, burnt mess)  Apparently they're tougher than they look.

(Then again I've never found a sharp drill bit in Mark's workshop, and he's not known for his patience when trying to drill things!)

Well known fix on other cars, though - on the MR2 you can, so I'm told, get away with no CAT at all if you space the third O2 sensor out with a couple of anti foulers. Not that I'd know. Nor try. Nor recommend such things.

[Big_Roger]

Hi All,
I have a 3.2 with the same problem so I have been reading this thread with interest.
I have my GS 500 lead permanently plugged into the test socket, and the analyser in the glove box ready to use when the EML comes on.
It's no problem clearing the light, but it does get annoying.

I would be interested to hear if anti fouling extensions work.

I am also surprised that some electronics minded whizz kid hasn't come up with an answer to our prayer. There must surely be some way to raise the threshold level that the light is triggered.

Roger

[Kevin Wood]

Hi All,
I have a 3.2 with the same problem so I have been reading this thread with interest.
I have my GS 500 lead permanently plugged into the test socket, and the analyser in the glove box ready to use when the EML comes on.
It's no problem clearing the light, but it does get annoying.

I would be interested to hear if anti fouling extensions work.

I am also surprised that some electronics minded whizz kid hasn't come up with an answer to our prayer. There must surely be some way to raise the threshold level that the light is triggered.

Roger

I've been thinking about that too. They key is to delay the response of the post-cat sensor. This is what spacing it out from the gas flow achieves, of course. The delay between front and back Lambda sensors under deliberate lean / rich conditions is what the ECU uses to assess cat efficiency.

Whilst the "threshold" is in ECU firmware and not easily accessible, it should not be that hard to fool the ECU electrically, but a spacer will probably be the easiest option for most (if you can find a sharp drill!).

Kevin

[aaronjb]

There are circuit diagrams available on the 'net - it's a fairly simple NE555 based thing..
http://www.mkiv.com/techarticles/oxygen_sensor_simulator/

Or.. here's one ready made with a GM connector:
http://www.afterthoughtsauto.com/o2sim.html

Kinda expensive to import £5s worth of parts from the US, though, even if it does have a nice moulded connector

[Kevin Wood]

There are circuit diagrams available on the 'net - it's a fairly simple NE555 based thing..
http://www.mkiv.com/techarticles/oxygen_sensor_simulator/

Or.. here's one ready made with a GM connector:
http://www.afterthoughtsauto.com/o2sim.html

Kinda expensive to import £5s worth of parts from the US, though, even if it does have a nice moulded connector

I don't think that will fool anything other than a very basic ECU.

The system on the 3.2 will use the front lambda as a reference, send the mixture rich, for example, watch both sensors and time the delay between the two. Over a few test cycles it will pick up a pattern. The delay has to be within an allowable window so just connecting a free-running oscillator won't cut it. Delaying the signal might, however.

Kevin

[Big_Roger]

Hi,
All very interesting.

Can anyone tell me where we can get these spark plug anti fouling spacers from. Surely we don't have to get them from USA.
From the threads mentioned, it seems we will need 4

I used them on an old oil burning Rover 50 years ago (shows my age)
but never seen any for some years.

Roger