I took my spark plugs (help me with the diagnosis)

[Snake]

Ok heres the hole story:
CEL ligth came on I ignnore it since evereything was runnig fine reset the ECU and and it turned off.
Next day same thing hapend so I decided to give my 4g63 a tune up since it was due.
New oil and filter ,spark plugs ans wires.

Now all of my spark plugs where fine except #3.
There was some oil on the threads and what I would describe as carbon deposits on the eletrode it did looked darker than the other 3.

After a day or to of driving same thing hapened CEL came on took of the spark plugs and again the #3 spark plug was a little oil on the threads were and the electrode loked darker than the other 3.

The engine does not smoke unless I gun it and its dark smoke the idle is preaty good.Also the engine starts the second time it tursn over not like most dsm that start from the first.It starts then from the first but only if you start it before 5 minutes are up.Dont know if that helps but I felt that had to say it anyway.
What could be causing this? Ive read doing a search that there is a spark plug seal on the valve cover that fills up the spark plug hole with oil.
Ive cheked the #3hole and there is litle oil on the threads of the valve head not alot like some people here said.

So thats it.Please.please help me diadgnose this problem

I want to fix this ASAP so that it wont cause some SERIOUS problems later on.
Thanks in advance

 

[Defiant]

Originally posted by Snake

CEL ligth came on I ignnore it since evereything was runnig fine reset the ECU and and it turned off.

So thats it.Please.please help me diadgnose this problem

I want to fix this ASAP so that it wont cause some SERIOUS problems later on.

Try reading the CEL code instead of just clearing it.

Each of those plug wells has a gasket on it, along with the valve cover gasket. #3 is leaking, and has nothing to do with your CEL.

Don't crack the valve cover when you put it back on.

 

[Snake]

Today I went to read the cel code and the mechanic told me that my car was runnig rich!
And that the carbon build up in the #3 spark plug could be beacuse the #3 injector was leaking(not closing fully).
That would explain why thre is more carbon build up in the spark plug and why my car starts the second time it turns over beacuse the piston is getting floded since the injector is leaking.

What do you guys think?