...Keep oil-fouling spark plugs... HELP

nickmav70

New Member

Jan 27, 2010

24

0

0

Savannah Ga

May 30, 2010

#1

• May 30, 2010

• #1

I cant figure out why i keep oil fouling spark plugs... Its only the back plugs (#3, #4,#7,and #8)... i changed the valve seals and it still does it... they are wet with oil when i pull them to check them and fouled but the front plugs are dry and still good...

someone please help... why would it do this?

 

J

Jmunk

Member

Sep 30, 2007

95

1

6

May 30, 2010

#2

• May 30, 2010

• #2

Sounds like bad oil rings if you replaced the valve seals. Check your PCV screen to make sure it's not causing too much pressure and pushing the oil past the rings.

 

KamiKaziDK

Member

May 16, 2005

555

0

17

Mesa, Az

May 30, 2010

#3

• May 30, 2010

• #3

How many miles are on the engine? Like jmunk said, check the pcv first to make sure you're not building up back pressure, but rings going out are likely the cause too.

 

nickmav70

New Member

Jan 27, 2010

24

0

0

Savannah Ga

May 31, 2010

#4

• May 31, 2010

• #4

its a pretty low mileage engine.... ill check the pcv screen today and see how that looks... any thoughts on why it would only be the cylinders at the rear of the engine?

 

DJTR

Member

Mar 19, 2004

228

0

16

OTTAWA, Ontario, Canada

Jun 2, 2010

#5

• Jun 2, 2010

• #5

PVC, Rings, also, are you runing a stock oil pump? High volume? How is your oil pressure?

First thing I would do at this point is a compression test!

 

wythors

Get off my lawn!!!

Founding Member

May 17, 2000

2,277

35

69

C Addle

Jun 2, 2010

#6

• Jun 2, 2010

• #6

Just out of curiousity, do you have a Cobra intake?

 

AOD86GT

Member

Nov 2, 2004

48

1

8

USA

Jun 4, 2010

#7

• Jun 4, 2010

• #7

nickmav70 said:

its a pretty low mileage engine.... ill check the pcv screen today and see how that looks... any thoughts on why it would only be the cylinders at the rear of the engine?

Click to expand...

Because you are probably sucking in oil through your upper intake. The oil usually puddles in the back of the intake through the vacuum hose coming off the pcv valve. Which is why the back of the engine/plugs are wet compared to the front. Did you try pulling off your upper intake and check where most of the oil is going into?