spark plugs keep fouling

[six7swb]

Can someone help me two spark plugs on the passanger side keep fouling i changed them a week ago and put this stuff i got at autozone and it went away, now its starting to come back is there a cheap fix to this problem i plan on swaping this 305 fir a 6.0 just need to buy some time till i get the money...thanks fellas

[landy]

Hmm, can you provide some details? That will help narrow down the potential causes. For example, are they coated with oil, black soot, wet with gas, etc?

Lots of smart folks on this bb that can help, but details are important.

[six7swb]

Sorry,ya two of the spark plugs get covered in oil and gunk but only on the passanger side once i replaced them it went away but i feel it starting to come back .starts sputering and gets worst as i drive it more till i switch out the plugs,and this is my daily driver i drive bout a hour a day to and from work .thanks

[Ridgeclimber]

I would start with a compression check. If it has low compression on the cylinders that keep fouling then there's your problem. If compression is good then possibly valve seals on those cylinders.

[six7swb]

Ill do that thanks ridge!

[imjeff]

Is it the rear cylinder?

[frank69]

I think u can still get some anti-foulers at most part stores. They are an adaptor that moves the plug out of the combustion chamber. Go to the parts store & talk to the guy with the most gray hair.

[six7swb]

Originally Posted by imjeff

Is it the rear cylinder?

Yes

[six7swb]

Originally Posted by frank69

I think u can still get some anti-foulers at most part stores. They are an adaptor that moves the plug out of the combustion chamber. Go to the parts store & talk to the guy with the most gray hair.

So the spark plug screws into anti fouler? And thanks

[Zane M]

There is a high liklihood that the valve seal(s) on those two cylinders are leaking.
For a short term fix get some anti-foulers.
Long term replace your valve seals. There are lots of videos on Youtube outlining the process in vehicle if so desired.

[imjeff]

Originally Posted by six7swb

Yes

Sounds like valve guides/seals as a prior post said. For whatever reason, it seems #7 & 8 lose seals first. Compression is probably ok, it blows some blue at start up and when you downshift. Anti-foulers will work. I had one SBC that I kept a box of plugs and a cheap plug wrench in the glove box. Drove it that way for 10 years. It was my DD and my commute was long enough that the plug fouled every couple months or so.