spark plug reading

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spark plug reading

Post  buick350 on Thu Apr 21, 2011 8:29 pm

Timing, heat range and A/F ratio all seen on the spark plug Question quite a few online articles about this, I thought I understood it but when I took My plug out I couldnt do it as accurately as I thought. Do we have any plug experts on board?
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Re: spark plug reading

Post  buick350 on Thu Apr 21, 2011 11:54 pm


This is about 40 miles on new plugs, do they tell a story?




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Re: spark plug reading

Post  michael1703 on Fri Apr 22, 2011 12:00 am

no expert, but mixture too rich

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Re: spark plug reading

Post  baz on Fri Apr 22, 2011 12:27 am

slightly black , means too rich , normal should b a grey/brown same as your tail pipe after a run. if its very white and glazed then thats valve timing or week mixture .
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Re: spark plug reading

Post  buick350 on Wed Jun 22, 2011 10:28 pm

I managed to get a bit of colour on the insulator by changing heat range one step colder, it now has a bit of a tan Very Happy
I need to get it hot to see if that has stopped the engine dieselling Exclamation
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