Spark Plug Burn Chart
Spark Plug Burn Chart . They have a longer insulator tip and they achieve a temperature higher than the deposition zone relatively fast. replace spark plugs Oil Fouling • Appearance: Black burn marks (carbon tracks) running vertically down the spark plug insulator towards the shell • Cause: Current discharge from the top terminal of the spark plug, down the outside of the insulator to earth; due to poor fitting/worn spark plug boot • Effect: Engine misfire Electrodes have been burned away, core nose has burned, glazed appearance. Ceramic tip is broken and missing from the firing tip. Spark Plug Eye Chart - TCCoA Forums (Harry Riley) Verrill: Plug Color Chart Overheated A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. k This is often caused by over advanced ignition, timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean air/fuel mixture, or a leaking intake manifold. In