hi
my little puma just squeezed through the mot ,the mixture was very high 4.9%
so i turned it down ,so it passed the mot but i went to turn it back up and wouldnt adjust?
then my co went to 7% and is stuck there now

so im looking for another ecu

or

information so that i can change the pot in my ecu ?
so has anybody ever done this ?
and what spec is the pot in the ecu ?

any help would be appriciated

thanks

 

Assuming you have a Weber Marelli L1 / L6 / L8 ecu, the CO pot only has 2 turns of + or - adjustment from its zero setting, if you turn it more than that it doesn't do anything. To get back to this setting, turn the screw 5 times in either direction, then turn it the opposite way 2 turns exactley, you now have upto 2 turns of adjustment in either direction.

 

its a L6


thanks for that
sounds a bit odd but ill give it a go ?

will i then get a reading if i measure the resistance?
or isit not possible to measure it?

 

so if that screw just turns and turns that dose not mean its broken then ?

is there no stop at all for the screw then

thanks again

 

That is correct, it will turn for as long as you can turn it, there is no stop for it. But it will only change the CO settings for upto 2 turns from zero, after that it wont adjust any more.

 

just to clarify thats 5 complete 360 degree turns either way then 2 complete 360 degree turns the other way

cheers

 

tried this and hasnt worked ,tried it a few ways and nothing

?

 

Think my cos has this issue, I'm stuck at 10%. Should we be turning the screw 5 times while the engine is on or off?