box\screw on boost pipe

[nikky]

hi all
could somebody tell what the little black box with a screw thing in it is?
what does it do?
ohh and a missfire at 2k im going to change rotor arm and cap i have done the plugs
cheers

[PeteG40]

its the co potentiometer - can alter the co levels, most people say its base level is 550 ohms

[nikky]

what does it do?
how do i set to 550 ohms
cheers

[PeteG40]

its a trim pot and will alter how rich or lean your car runs.

you connect a multimeter over the two end pins in the plug i think

[nikky]

ahh so thats why im abit rich
il look into it
cheers bud

[hayesey]

it also has an inlet air temp sensor in it. 

You need to connect a gas analyser to the exhaust to set the CO pot properly but 500ohms - 650ohms is a reasonable base setting for it without access to a gas analyser. 

[nikky]

im going to my mates mot station and get it on a lambda probe thing and see what its doing
i think il get a g40 chip instead of my g60 one then i can use my g40 injectors as i have 241cc/min at 3bar in now
and a 65mm toothy instead of 63mm