Is this the correct Fuel Analyzer tool to properly tweak the AFM screw?

[IS300E30]

I know people mention you cannot touch that screw without a fuel analyzer, is the below link the proper fuel analyzer to use?

https://www.raecorents.com/testo-350-engine-kit-for-combustion-system-compliance-testing-and-troubleshooting/

I ask, as per Bentley (screenshot below) the CO range should be between 0.4% - 0.8%, while the Testo 350 fuel analyzer tool I provided the link to will show a "CO range" of "0 - 10000 PPM" and not a percentage range like Bentley shows. The "02 range" for the tool however does show a percentage range of 0 - 25%

[TobyB]

For $200+, I'd just stick a wideband sensor in the exhaust, and mostly ignore it if the car was running well. CO has a relationship to unburnt hydrocarbons
in the exhaust, which is what it was used to indicate, back in the earlier days of emission controls. Now, the oxygen content tells you more, and continuous
metering can be a really useful tuning tool.

Gunson used to- hey, still does- make a CO meter. I had one once in the narrowband era, but drove over it by accident one day.
It was never very easy to use...

t

[IS300E30]

For $200+, I'd just stick a wideband sensor in the exhaust, and mostly ignore it if the car was running well. CO has a relationship to unburnt hydrocarbons
in the exhaust, which is what it was used to indicate, back in the earlier days of emission controls. Now, the oxygen content tells you more, and continuous
metering can be a really useful tuning tool.

Gunson used to- hey, still does- make a CO meter. I had one once in the narrowband era, but drove over it by accident one day.
It was never very easy to use...

t

I did a Google search on the Gunson and a lot of people are concerned on its accuracy as its only accurate to 0.5%

Will the Testo 350 that I shared work for the e30?

[TobyB]

Yeah, the one I had was relatively accurate (as in, a small carb change would make a corresponding CO change)
but probably not very absolutely accurate. It helped get me started. Then I went to narrowband. Then wideband, and never looked back.

I've never used that Test-O, but I can't see why it wouldn't....
but I can't offer any help with the resolution, as ppm seems like it's designed to find exhaust CO leaks, not setting tailpipe levels.

t

[IS300E30]

For $200+, I'd just stick a wideband sensor in the exhaust, and mostly ignore it if the car was running well. CO has a relationship to unburnt hydrocarbons
in the exhaust, which is what it was used to indicate, back in the earlier days of emission controls. Now, the oxygen content tells you more, and continuous
metering can be a really useful tuning tool.

Gunson used to- hey, still does- make a CO meter. I had one once in the narrowband era, but drove over it by accident one day.
It was never very easy to use...

t

I just got the following:

https://www.amazon.com/dp/B001S7W836?ref_=pe_125775000_1044873430_fed_asin_title

With that, I located the attached screenshot (AFR to CO% conversion chart).

With the Innovate LM2 that reads AFR, and using the CO% conversion, would I then properly be able to adjust my AFM screw to produce the correct CO% per Bentley?

[TobyB]

yep, that'd do it!

t

[IS300E30]

yep, that'd do it!

t

Thank you!