Dave connors Posted May 8, 2021 Share Posted May 8, 2021 what is the correct method for adjusting the tick over on a sigma engine is it done by adjusting the throttle cable or the screw on the TB Link to comment Share on other sites More sharing options...
oilyhands Posted May 8, 2021 Share Posted May 8, 2021 Idle should be controlled by the ECU. But.. there should always be slack in the cable, so I'd say via the throttle stop.Oily Link to comment Share on other sites More sharing options...
ChrisC Posted May 8, 2021 Share Posted May 8, 2021 Is your Sigma a 150? The idle speed is controlled by the ECU, but the throttle does need to be open enough to maintain that engine speed, which is a mechanical adjustment. Link to comment Share on other sites More sharing options...
Tom_Arundel Posted May 8, 2021 Share Posted May 8, 2021 Why do you need to adjust it? Link to comment Share on other sites More sharing options...
ChrisC Posted May 8, 2021 Share Posted May 8, 2021 My experience is with a fair few Sigmas 150s mine and others, and one 125. The 125 once set seemed to say set, but my 150 liked a tweak about once a year. Link to comment Share on other sites More sharing options...
Dave connors Posted May 8, 2021 Author Share Posted May 8, 2021 mine is an ex sigmax car it does run very rich and struggles to tick over the emissions would not get though an mot at the moment not sure if the lamda sensor is shot which wouldn't help gues it needs to go on a rolling road and get tuned Link to comment Share on other sites More sharing options...
Tom_Arundel Posted May 8, 2021 Share Posted May 8, 2021 Unplug the sensor and see if it makes a difference. Link to comment Share on other sites More sharing options...
ChrisC Posted May 9, 2021 Share Posted May 9, 2021 Sounds classic lambda sensor to me. But agree with Tom, unplug it and test. It won't pass an MOT without it, and it will still be rich, but it won't be at the extreme of the possible adjustment.If it is faulty, try to stick with quality Original or OEM replacements (Ford or Bosch) and avoid fakes. Link to comment Share on other sites More sharing options...
Dave connors Posted May 9, 2021 Author Share Posted May 9, 2021 Makes no difference when its unplugged so it looks like a new lambda sensor Link to comment Share on other sites More sharing options...
Dave connors Posted May 9, 2021 Author Share Posted May 9, 2021 Does anyone know the part number of the lambda sensor I've taken a look at mine and the numbers are vary faint and nothing shows on an Internet search on the numbers I can see Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 9, 2021 Member Share Posted May 9, 2021 Private Message sent. Link to comment Share on other sites More sharing options...
Area Representative Iain McCallum Posted May 10, 2021 Area Representative Share Posted May 10, 2021 Hi Dave,Mine was replaced a bit ago on my Sigma 150. It is a Danfoss MBS 1350 (063G1333)Cheers Iain Link to comment Share on other sites More sharing options...
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