Not quite sure what you mean. I have had one of these for the past 15 years or so and although I have had it properly checked with a 3 gas sample, it has never had to be re-calibrated. This machine goes through a 10 minute check procedure during warm up and if all is well, the four readings will show zero's except for the 02 which will show exactly what your machine is showing. Your machine is showing 20 ppm hc's which is probably HC hang up. The only time mine requires manual adjustment with the micro adjusters is when the O2 cell starts to run down. The machine will tell you this with illuminated lights above the adjusters which indicates which screw to turn and in which direction. Once the adjustment is correct, then the light will go out. If you tried to fiddle with the adjusters, then the machine will let you know on next start up and will not work until you have adjusted it back again. The machine also shuts down every 30 minutes during use to check and recalibrate itself.... normally just as you are about to adjust the mixture setting on a carb or note the gas readings!
In summary, these machines are bomb proof, very accurate (although HC's are only measured in gradients of 20's). You should not try to adjust anything until the machine tells you so which is rare and usually indicates that the 02 cell is on its way out.
I am away for 2 weeks in Italy tomorrow so I cannot answer any further questions you may have, but if you are desperate you can voice mail or text on 07860829718.
Regards
Pete M
Message Thread
« Back to index | View thread »
Copyright © uk autotalk