My father-in-law used to do it on his Chev by seeing how long a plack line his tyres can leave on the road... In a Volvo I just tune it like I would a carburettor. In fact, that's more or less what it is. And a Volt meter will load your Lambda sensor too much, can't use that. So listen to the idle speed and fine the rich corner. Then drop it back a bit if you want, but not to the lean corner. You might notice a nice performance, I did with my wife's '88 B200E (came from the Philipines, no Lambda). I did not bother dropping it back to the leaner side, and my wife gets over 10km/L (whatever MPG that is).

Have fun...

That is kind of an odd one there. Normally you would treat it like a pre '79 car and simply use an infra red bench and set your CO to around 1.0-1.5% at idle. I guess you could kind of try and swag a setting using your O2 sensor. It is designed to read between .1-.9 volts, the lower the voltage the leaner the A/F mixture. If you monitored it with a volt meter, twisted the screw every so slightly clockwise until you had a constant reading of .9 volts and then back it off so it swung back down to .1 and just a teanie tiny tweak back clockwise and see what the volt meter says. Mind you this is all theoretical and may not even work. What I really suggest you do is go to your local smog shop or mechanic that has an hc/co machine and have them set it up right. Does the car still have a catalytic converter? If it does you will need to do your sampling upstream (another pain in the ass) as the cat will clean up the exhaust and your readings will not be correct.


Mark