Tool needed: tube to insert in cat test hole & use LM2

[911 tweaks]

Is there a tool available to enable access into the test port/hole on the catalytic converters on 911 engines so the exhaust gas can be measured, thus allowing adjustment of the air fuel mixture screw on the air flow meter...?

I have an LM2 exhaust tester but it only works on non cat cars ie exhaust gases that have not been cooked passing thru a cat...
Basically, is there a work around to test & adj the a/f mixture on a catalytic 911 if only having the LM2 exhaust gas tester w/o going to a dealer a/o a million dollar tester...?

(HINT: I was thinking that if someone maybe made a device where a tube device was made that one end of the tube device was stuck into the test port and on the other end of the tube was welded a bung like part that an o2 sensor screwed into to, thus allowing sniffing of exhaust gas BEFORE the cat and the connector on the end of the o2 sensor hooked up to the LM2 device as it does normally now...))
**Another hair brained idea from Bob...?? )) LOL

Thank you for any and all suggestions... Bob

[911 tweaks]

So... if no one has a device as I described, what is the least expensive out there tool to buy to do exhaust gas testing for catalytic converter 911 cars...?
Thx

[rwest]

Could you just have a muffler shop weld a bung in pre cat and screw the oxy sensor in for testing and screw in a plug for normal driving?

[Trackrash]

Not sure what car you have, but some cars, ie. Carreres, have an O2 sensor located before the cat.

Why can't you hook a gauge up using your existing sensor?

[911 tweaks]

Thank you guys for your replies...
I want to be able to check a/f ratio WITH o2senson plugged in also, so...
Maybe I need to weld in another bung, but was wondering if a tool or make a tool or someone made a tool as I seek...

[911 tweaks]

If I go the route of using an o2 sensor in the one port on the cat AND be able to connect it to the LM2 device I will need to splice in a connector on end of o2 pigtail to b able to connect to the LM...

[911 tweaks]

It’s looking like with my only having the LM2 that I will have to screw on an o2 sensor into the one port on the cat and go from there...
BUT, I was wondering if someone had a work around and/or an affordable tool or made a device as I thought may work...
I will b patient to see if someone may post another idea...
Thx again guys...))

[Mark Henry]

Weld a bung in, O2 meters need to reach a certain temp to read correctly.
Heated lambdas turn off at a timed point and use the exhaust temp to keep them hot.
If they are below a certain temp they read lean.