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Dixa1225
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The method described is for a K series. This is not applicable for a Sigma engined car. Pure chance this has cured the problem. 

GulfSeven
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It requires Easimap, an MBE cable and getting under the bonnet with tools on a Sigma unfortunately.

Perhaps depressing the accelerator pedal lots freed up the cable?

Tim.

Gulf Racing 310R

StevehS3
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I was thinking that, It is always good to take it to the floor on a regular basis ;-)

AlanO
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Well it worked for me! I'd previously opened the throttle in car and by hand 'under the bonnet', checked its  physical peration etc with no improvement so I'm bewildered by your thoughts. Anyway cars back to normal and I'm a happy bunny. Cheers.

AlanO
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Well it worked for me! I'd previously opened the throttle in car and by hand 'under the bonnet', checked its  physical peration etc with no improvement so I'm bewildered by your thoughts. Anyway cars back to normal and I'm a happy bunny. Cheers.

aerobod
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One other thing to check on the Duratec that can cause uneven idle due to the throttle blade not returning to the stop correctly, is that the throttle body to air filter Jubilee clip isn't overtightened. If it is and depending on temperature variation, it can cause slight jamming due to throttle body distortion.

James

Tom_Arundel
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Don`t start up with your foot on the throttle, it confuses the ECU.

Watch out for overtight TPS mounting screws stopping throttle return

AlanO
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Thanks Tom, putting my foot on the throttle at start up is something I may habe inadvertently done. Very difficult to get out the habit! 

aerobod
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With the MBE ECU, there isn't any standard throttle calibration done at startup (throttle site is set purely by TPS voltage when at the stop and the specified voltage at full throttle, then mapped on a static curve between the two), so I don't think having a foot on the throttle when staring the engine will have any adverse affect on how it runs. It shouldn't be necessary to use throttle to start the car, though. When I put in an unlocked 9A4 ECU it initially had sub-par mapping when cold and required throttle to start it, but that had no adverse affect on how the car ran after it had warmed up a bit.

James

ScottR400D
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Looking back at the original post, the worsening tickover getting worse as the car warms is not what most see from poor set ups is it? Generally things improve as the engine warms. 

I wonder if that does point to a mechanical issue, any one of those indicated along the thread, and the 'solution' is just a coincidence. Time will tell I guess. 

L7C