my 2 wd saph is running rich,how do i adjust the mixture?do i need any speacialist tools to do it to get it right or is it speacialist only?

 

Needs to go on a gas analyser mate. Dont touch it, get it done properly.

 

As above m8.

 

The adjustment screw is on the ecu but like already said you need the car to go on a gas analiser lol.I took my car to a bloke who does 2wd rolling road segt ups and he adjusted my fuel/air mixture so that my cossie is running rich and its been like this for over 2 years now.

 

Be best to put on a a new CTS before you get it done as well, if over 2/3 years old.
tabetha

 

What reading should you get at idle?

 

i can get it on a gas analyser at a mot station+then adjust it down,i am up in the northern isles+no so easy to get 2 a specialist without a long expensive ferry trip!

 

To answer your question.. "How do I do it CORRECTLY"..

1) Speak to whoever wrote the chip, ask them what it should be.
2) Get someone with a gas analyser to set the above.

 

you can adjust the mixture on the ecu; however this will adjust it for the whole map (i believe)

what chip is in the car?

it really does depend on the chip to be honest; it needs to be below 3% CO for an MOT

for example, my MSD chip needs to have the CO at between 2.5-2.7% at idle

if you have wideband you "could" adjust the CO to below 3% and then make sure the fueling is bang on using the wideband on boost - as this is when its "most" important

 

What about air/fuel ratio? What should that be at idle?