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Found White Powder On No2 Plug!like What Tha!

cosworth1971

By cosworth1971,
in General Maintenance

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cosworth1971 Community Regular

cosworth1971

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Posted

just went to change plugs that have been done about 3000ks ago to try copper ones and found no2 spark plug had white powder all around outside but electrode looked like the rest.Ive never see that before and it looked like the powder u can get on a battery lead :) .

what could it mean?and am i alone in ever seeing this.I only drive the car on weekends and rarely

as u can see its just number 2 ,number one and 3 and all others are new looking

post-18564-1184730376_thumb.jpg

RANDY Veteran

RANDY

Posted
Posted

Usually a white or milky substance is when water mixes with oil... like... if you had a blown head-gasket or something.

Your white gunk is well above the thread, where the rubber boot of the coilpack would normally be. So I'd rule that one out.

It's also nowhere near where the sparkplug arcs... so it shouldn't be a mixture thing.

It could be old grease maybe? Someone put new plugs in with a really filthy sparkplug socket or something?

cosworth1971 Community Regular

cosworth1971

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Usually a white or milky substance is when water mixes with oil... like... if you had a blown head-gasket or something.

Your white gunk is well above the thread, where the rubber boot of the coilpack would normally be. So I'd rule that one out.

It's also nowhere near where the sparkplug arcs... so it shouldn't be a mixture thing.

It could be old grease maybe? Someone put new plugs in with a really filthy sparkplug socket or something?

nope new socket set?im confussed its like fungus on my sparkplug(joke).It just like the chalky stuff u see on a battery post but never seen it on a plug b4!

Lunatikk Rising Star

Lunatikk

Posted
Posted

Here's a wild stab........

Check the boot on the bottom of that particular coil & I'm guessing it will be somehow damaged. At some time some water got in there (washing down the engine maybe) & with the heat from the engine, boiled off/evaporated away & the remnants of what was left behind is what you are seeing in the white-ish powder.

I did exactly the above with my own car & even though I was (or so I thought) being careful with the amount of water going onto the top covers etc I still managed to fill not one but two of the plug recesses in the head. On closer inspection someone previous to me had, for whatever reason, taken a blade to the bottom of the coil boot.

Shouldn't happen, but it can & does :)

Godzilla32 Veteran

Godzilla32

Posted
Posted

Because its not on the thread itself it rules out a loose plug. So its most likely a poor connection between the coil and plug causing arcing or as previously mentioned corrosion from water sitting in there. Thats the most likely cause but if it were the case you would be experiencing a decent misfire from it!

Deren

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