johnpbransfield Posted February 2, 2016 Share Posted February 2, 2016 Just changing the plugs 150 Sigma (2009) Plugs at the moment Ford MoCo AYFS22CB probably original ones. Bought some new ones from local Ford dealer above now replaced by MoCo CYFS-12VN4. Car won't start/tick over on these plugs, put the old ones back in and tick over is fine. Had a word with Ford said the gap should be 1.2mm which it appears to be. Anyone running these plugs? If so what gap should they be, I have heard 1.00mm mentioned but I would have thought Ford would know the correct gap! Thanks in advance. Link to comment Share on other sites More sharing options...
colindavies56 Posted February 2, 2016 Share Posted February 2, 2016 I have same as your 1st plugs,their motorcraft and1.3 don't know your new ones,maybe he's given you ones from the vct engine.they could be running hot/cold that's why their not firing. Link to comment Share on other sites More sharing options...
Dr Slotter Posted February 2, 2016 Share Posted February 2, 2016 IIRC when Ford last upgraded the what CC call a 'Sigma' they changed the sparkplug spec. to what you have been given. These new plugs run fine in the OEM Ford version of 'Sigma' either side of the upgrade, but the Caterham 150 spec. is, as you've seen, not that happy about them.IMO just get the equivalent NGK plug which will be something like NGK TR5B-13 (check that though). Link to comment Share on other sites More sharing options...
Dr Slotter Posted February 2, 2016 Share Posted February 2, 2016 Post crossed with Colin's, got distracted by a phonecall! Link to comment Share on other sites More sharing options...
Mark Durrant Posted February 2, 2016 Share Posted February 2, 2016 JohnYou need NGK TR5B-13 see here Link to comment Share on other sites More sharing options...
johnpbransfield Posted February 3, 2016 Author Share Posted February 3, 2016 Well Ford would not take them back as they had been used for 10 seconds!Steve at Track n Road said to set the gap about 37 thou.....fired straight up and runs fine with idle about 900. I shall get some NGK TR5B-13 for if things go wrong! Thanks for all the advice. Link to comment Share on other sites More sharing options...
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