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Diagnosing Spark Plug Colour 

 

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 Post subject: Diagnosing Spark Plug Colour
Posted: Sat Aug 29, 2015 11:27 am 
Getting Side Ways
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Joined: 1st Apr 2005

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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

I know a lot has been written on this subject, but I'm struggling to read the plugs on my AU2 XR6 VCT. I just replaced the plugs - after way too long - and I am seeing inconsistent colour on the side electrodes. The Autolite 985s that came out show a range of colour change location: from right at the tip to right at the base (see pic attached). This is supposed to mean that the plugs range from too cold to too hot. But they are identical spark plugs. I checked the ignition leads and coil pack, and they are excellent: all three circuits (1-6, 2-5, 3-4) are showing 12kohms resistance, so that is not the cause. And the colour of the insulators was normal - white one side, brown/grey the other. The car runs fine, but I am interested in finding out if I have a problem looming. Is it maybe indicating lean in one cylinder and rich in another? Thanks for the help.
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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: Diagnosing Spark Plug Colour
Posted: Sun Aug 30, 2015 7:35 pm 
Fordmods Newbie
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Joined: 24th Nov 2012

Ride: XR8 ute

Location: Melbourne
VIC, Australia

Your centre electrodes look fine, this is what you should be focusing on. I wouldnt worry about the grounds in this case they don't appear excessively burnt. Perhaps the orientation of the plugs in the combustion chamber are having an effect? IE the ground electrodes are facing a slightly different way?
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 Post subject: Re: Diagnosing Spark Plug Colour
Posted: Tue Sep 01, 2015 9:04 pm 
Getting Side Ways
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Posts: 836

Joined: 1st Apr 2005

Gallery: 4 images

Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

That would make sense. Thanks very much.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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