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Concerned - oil (or fuel?) around plugs

Ronin 09

By Ronin 09,
in General Automotive Discussion

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Ronin 09 Grand Master

Ronin 09

Posted
Posted

Some of you may or may not know I have had some misfire problems.

My 32GTR would miss badly on load.

After a few weeks I sourced some new coils, and this solved most of the problems.

Until this time I had been running new OWS iridium plugs.

I tried (and have fixed) the very minor missing problem with changing back to coppers, but when I removed the OWS plugs (only 1000 kays), the electrode and tip were clean, but the plug seat (where it screws into the head) was wet on #2 and #3. The rest were dry.

Is this a problem?

I noticed the plugs were not completely tight - would this cause it?

Or driving around with dodgy coils fouling the plugs, then when new coils went in the tips and electrodes cleaned up - i.e. wetness left over from misfiring?

Any ideas? Thanks

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Guest two.06l

Guest two.06l

Posted
Posted

G'day Ronin 09

we have had wet plugs a few times in my car, missfiring also. Went through 5 to 6 sets of plugs before finding the correct type and gap. (they would always get fouled up). Last time I had the problem car wouldnt even start, found that the plugs were wet with fuel. Now I have correct plugs and gaps and new coils and havent had problem since.

Just my thoughts anyway. Cheers

Ronin 09 Grand Master

Ronin 09

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Posted

Hi Stacey,

Thanks for that info... I have my plugs gapped at 0.8 (it was missing at any larger gap) and the car actually doesn't like starting all the time - needs alot of cranking to turn over.

In your situation, wouldn't all the plugs be wet? Only #2 and #3 are in my case. I am going to pull them out now and check them out again

Thanks heaps

JezR31 Mentor

JezR31

Posted
Posted

oil fouling (wet) usually means that oil is getting into the combustion chamber.

They have oil on the electrode and tip, but you said that the electrode and tip were clean so im not to sure where the oil is coming from.

Oil fouled plugs make an engine missfire bad which is a symtom you have.

Check for worn piston rings, valve stem seals and valve guides.

I dont it would be fuel because it leaves dry carbon on the tip and electrode.

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