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Jun 14th, 2026
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Joined: Jan 2018
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OP
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Hi, I changed the spark plugs in my Ford Sigma engined 4/4 Sport today after at least 16,000 miles. I say at least as the car has now covered 31,000 miles and had 15,000 miles on it when I bought it but I've no idea if they have ever been changed before? It's a 2009 model. The plugs came out with a "RED" tinge on them (see photos), the ceramic is red and parts of the metal electrode is red, does anyone know what that would signify? I know black could be a rich mixture or burning oil, white could be a weak mixture or running hot and grey is ok.....BUT RED? Any ideas? Sorry the photos aren't focused very well. Thank you ![[Linked Image]](https://tm-img.com/images/2022/03/10/plug.png) ![[Linked Image]](https://tm-img.com/images/2022/03/10/plug3.png)
Last edited by Redfate; 10/03/22 07:52 PM.
Paul
2009 4/4 Sport in Red
2022 Harley Davidson FXLRS Low Rider S
1977 Triumph Stag
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Joined: Nov 2018
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Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,667 Likes: 433 |
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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Wow, that was quick, thank you  So red is normal, I've never seen that before  I guess I can just carry on  Thank you.
Paul
2009 4/4 Sport in Red
2022 Harley Davidson FXLRS Low Rider S
1977 Triumph Stag
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Joined: Nov 2015
Posts: 8,672 Likes: 489
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,672 Likes: 489 |
Don't know much about the Sigma, but Roadsters with the Ford V6 use Iridium plugs which after 50,000 miles and numerous fuel types looked as good as new
May be worth looking for the Iridium version for a Sigma ?
Jon M
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Cain has the iridium plugs for the Sigma engine , my car is now 7years old with 15K miles , I am thinking it is time to have the timing belt changed does anyone have the part number for the belt as I will get my local garage to do it when it is in for MOT .
Jimmy
2015 4/4 Sport Green
2018 VW Tiguan
1969 Morris Minor Traveller
1960 Morris Minor Saloon
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Joined: Feb 2010
Posts: 1,415
Has a lot to Say!
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Has a lot to Say!
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Modern unleaded fuel doesn't respect the traditional plug colours regarding state of tune Baby Sh*t brown for a correctly set mixture doesn't happen anymore... 
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Joined: Jan 2018
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Modern unleaded fuel doesn't respect the traditional plug colours regarding state of tune Baby Sh*t brown for a correctly set mixture doesn't happen anymore... Yes, it was quite a suprise to me when i took them out. I'm quite happy now and see no need to change from the NGK's, they work just great. I only changed the plugs as part of the service I was doing, thought I may as well do it just to be sure. 
Paul
2009 4/4 Sport in Red
2022 Harley Davidson FXLRS Low Rider S
1977 Triumph Stag
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Joined: Aug 2010
Posts: 5,465 Likes: 171
Charter Member
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Charter Member
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Cain has the iridium plugs for the Sigma engine , my car is now 7years old with 15K miles , I am thinking it is time to have the timing belt changed does anyone have the part number for the belt as I will get my local garage to do it when it is in for MOT . IIRC, you need a kit - including water pump. A Caterham based post on Pistonheads quotes: OEM Ford part no: 1780142 for the kit. In your shoes, I would call someone like Cain or Brands Hatch Morgans to be sure of getting the right parts.
Paul
Costock, UK
Plus Four 75th - Furka Rouge - Pip
Disco 5
Teddy - 17h1 Irish Draught cross
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Joined: Mar 2017
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Talk Morgan Expert
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Talk Morgan Expert
Joined: Mar 2017
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Cain has the iridium plugs for the Sigma engine , my car is now 7years old with 15K miles , I am thinking it is time to have the timing belt changed does anyone have the part number for the belt as I will get my local garage to do it when it is in for MOT . I believe this is the timing belt part number: timing belt kit inc water pump KP35669XS
Craig Jezz
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Jimmy
2015 4/4 Sport Green
2018 VW Tiguan
1969 Morris Minor Traveller
1960 Morris Minor Saloon
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