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  #1 (permalink)  
Old 08-11-2015, 11:38 AM
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Default Spark Plugs Condition

Hey everyone,

I have 500 miles on my rebuilt 1993 5.0 engine that's running a B cam, dual plane Cobra intake, full headers to 2.5" side exhaust, and a Holley 600 carb in my '66 Mustang. I pulled the plugs yesterday and wanted to get everyone's opinion on how they look.

Thanks!
Brent

Cylinders 1-4 (Passenger side): black background
Cylinders 5-8 (Driver Side): blue background
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Old 08-12-2015, 06:20 PM
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All your plugs look great.
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Old 08-12-2015, 07:20 PM
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Thanks DWRAT!
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Old 08-13-2015, 06:05 AM
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Smile

great site for sparkplug reading

sparkplugreading
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Old 08-13-2015, 06:10 AM
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A little rich on the idle, need to pull a degree of timing out, and a lug nut on your rear passenger side wheel is loose.
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Old 08-13-2015, 10:22 AM
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Look almost darn near perfect!
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Old 08-13-2015, 01:56 PM
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Thanks everyone! Dwight, that spark plug site is great. Blykins, if you can tell that from my plugs you should take up poker!

I honestly thought they might be a bit on the lean side due to the light tanning on the porcelain.
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Old 08-13-2015, 02:02 PM
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That color is pretty much optimal. When they start getting glistening white and you have issues.

By the way, I was serious about two out of three of the things I said above…
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Old 08-13-2015, 05:26 PM
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Cocoa brown and look very nice to me.
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Old 08-13-2015, 09:01 PM
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Quote:
Originally Posted by blykins View Post
A little rich on the idle, need to pull a degree of timing out,
Explain your advise please.
Mostly the part about timing, what tells you to pull timing a bit?
Dan
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Old 08-14-2015, 04:47 AM
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The base ring shows to be a tad sooty, most likely because of a rich idle.

If you look at the heat mark on the ground strap that will tell you a lot about where the timing needs to be.
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