f40 cab Posted September 17, 2018 Share Posted September 17, 2018 Hi just need some help with adjusting co2 potentiometer on efi. I've had multimeter on it and I know it works. But when adjusting it the exhaust co2 gas won't change on gas reader. Does it need to be plugged in to diagnostic reader to adjust. Or should it make a difference straight away. Quote Link to comment Share on other sites More sharing options...
Paul Grainger Posted September 23, 2018 Share Posted September 23, 2018 Doesnt need to be plugged in. Should just adjust. The potentiometers are prone to failure. If you are sure its ok then check for air leaks.. Cheers Quote Link to comment Share on other sites More sharing options...
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