Plug Colour

Post by **David53** » Sun Jul 26, 2009 4:41 am

Just fitted a new coil, dizzy cap, rotor and silicon leads. An amazing difference to starting and performance!

Still checking the mixture. After fitting new ignition parts went for a 20 minute spin then pulled plugs. What do you think of the colour? To me it looks a little lean:

You can see from the sooty surround that it has been too rich in the past, but what do you think the tip colour tells now?

Post by **bmcecosse** » Sun Jul 26, 2009 11:24 am

It's the insulator colour that matters - looks spot-on to me for decent running and good economy. Sometimes 2/3 are a bit different to 1/4 - which bore did this come from ?

Post by **David53** » Sun Jul 26, 2009 11:33 am

This was cylinder 1. I plan to have a really good run tomorrow and check all of them

Post by **bmcecosse** » Sun Jul 26, 2009 11:36 am

You should also do a 'full throttle' check - run the car flat out up a hill as long as possible - then shut off the ignition and coast to a halt. Check plugs under these conditions.

Post by **millerman** » Sun Jul 26, 2009 2:45 pm

Try this link re plug colour

http://www.dansmc.com/Spark_Plugs/Spark ... talog.html