Spark Plug Fouling

[allenhudson91]

I have a 93 explorer 4.0
My spark plugs fouled up on me, so i cleaned them and put them back in. I drove about 15 miles and they were fouled up again. When they foul they have a dry black residue on them and they smell like gas. When i clean them up and put them back in, the car runs great until they foul up again. They are gapped correctly.

 

[MrShorty]

Sounds like the engine is running too rich. Is this for all 6 spark plugs/cylinders? Any codes in the computer? Checked fuel pressure/leaky FPR?

 

[allenhudson91]

Sounds like the engine is running too rich. Is this for all 6 spark plugs/cylinders? Any codes in the computer? Checked fuel pressure/leaky FPR?

last time it was only on the right side of the engine. It hasn't pulled any codes so far. No, i have not checked the fuel pressure yet. I get paid this tuesday, thats when i will be able to check the pressure.

 

[MrShorty]

Does your '93 have one O2 sensor or two ('93 was a transition year, so some have two and some have one)? If the problem is consistently on the right side and you have two O2 sensors, I would check the O2 sensor for the offending side and make sure it is functioning and the wiring to the computer is intact.