tuning up with an exhaust gas analyzer

[Dash808]

Reserecting an old thread if you don't mind...

So an exhaust gas analyzer measures CO at idle.  How do you measure CO at speed?  Or is it assumed that the correct setting at idle is "close enough" everywhere else?

Like what Jim asked above, I was wondering if a wideband AFR gauge would be beneficial to use.  Jim did you ever figure it out? And have you ever dynoed your 230?

Checking Ebay, looks like the Gunson tester went from $130 a few yrs ago to around $230 now.   Anyone want to rent theirs?

[bigwillie]

I have an old renault 11 that I want to tune up.  I have a gunson gas analyser.  The haynes manual specifies a co2 level of 1.5.  I set the machine up in clear air and after the required time I set the machine to 2.  The initial readind was over 10 and I managed to tune it down to 1.5. But should I be tuning down to 3.5

[stickandrudderman]

You do realise that this forum is dedicated to a particular model of Mercedes built in the 1960s don't you?

[Garry]

I dont suggest you tune it down to 3.5, I suggest you sell the car and buy a Pagoda, it will fix the problem completely.

Garry

[stickandrudderman]

Selling a Renault 11 won't even generate enough funds to by a set of rear pads for a pagoda!

[Jack Jones]

For those of you who have a Gunson CO meter, the zero point needs to be set periodically to insure your unit is properly calibrated. I had an issue with mine and the manufacturer sent me the attached sheet and now the meter reads correctly. The sheet does not tell you that you need to gain access behind the display panel by removal of the screw in the bottom of the unit and separating the housing. ONLY ADJUST SCREWS A & B as described. Do not touch C & D or you're SOL.

[jerrycastillo]

Hello Bob,
I'm trying to get my 280SL to the proper 800rpm at idle speed. Do you have a copy of Stu Ritter article on Star regarding this issue. I cannot access the article as I am not a member of MBCA.

Thank you!

Regards,

Gerardo Schlossberg
1970 280SL

[enriquegarcia]

Hello Group,

I thought I had read every post related to fuel system troubles, but I just now found this thread that seems useful. If anyone has a copy of the referenced article by Stu Riter in Star Magazine I would very much appreciate a copy.

My '68 280SL has never run right since I got it 15 years ago and now that I have recently fixed numerous items the PO had seriously screwed up, it is running even worse! It always starts and idles well when cold, but with my "fixes" it now badly stumbles and finally dies as it warms up and fouls the plugs in no time. I'd like to take a look at the Stu Riter article before I finally give up and turn it over to a professional for possible FIP rebuild.

Regards to all,
Enrique Garcia