What do the all the different burn marks/colours mean? Are these rich/lean mixtures, burning oil etc?
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spark plugs diagnisis (pics)
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spark plugs diagnisis (pics)
I just pulled these plugs out of my 99 GU 4.5 petrol/gas. They have done just under 20,000km. The number in the pics is the cylinder it came from.
What do the all the different burn marks/colours mean? Are these rich/lean mixtures, burning oil etc?
What do the all the different burn marks/colours mean? Are these rich/lean mixtures, burning oil etc?
No 1 looks spot on, the others look a little on the lean side.
No 5 looks like it's been getting hot, you might need to go one heat range colder plugs
No 5 looks like it's been getting hot, you might need to go one heat range colder plugs
Last edited by 351ciofgrunt on Sun Apr 11, 2010 1:36 pm, edited 1 time in total.
GQ Patrol Wagon, 6 point roll cage
351 cleveland, CHI heads, solid cam, Funnelweb single plane, 750 HP DP
351 cleveland, CHI heads, solid cam, Funnelweb single plane, 750 HP DP
As mentioned, 1 is spot on.. The rest look a little lean. Gaps look fine. Maybe could be closed a little for gas but they look about right for the standard petrol application.
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I spent the extra and put platinums in mine .. the rear two are a pita to change in my opinion. Cost 3 times more last 5-6 times longer can run a bigger gap with less strain on the ignition system etc etc ..
The 1st one looks great the others look OK I certaily would not be staying up at night worrying about em.
The 1st one looks great the others look OK I certaily would not be staying up at night worrying about em.
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