Question about 1986 Isuzu Pickup

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I have oil fouling my plugs. is there an oil seal in the head leaking oil into the chamber or is it maybe oil rings on the pistons

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You may have bad valve stem seals, bad valve guides or bad oil control rings on the pistons.

Posted on May 15, 2010

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I have a 1999 oldsmobile intrigue and it has fouled my number four plug twice now. So, my question is, what could be causing it and how do i fix the problem?


do a compression test on number 4
hardened valve stem seals =leaking oil into the combustion chamber
a leaky valve seat
a broken piston ring

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2007 ford 4.0 v6 why are all my spark plugdls on passenger side oil soaked but drivers side is fine doesn't smoke did compression test all good not a blown intake gasket had it checked anyone know?


Hi Josh:
I'd put fresh plugs in it and drive it for a week, then check the plugs.
Sometimes you will get high compression readings that are not valid because the rings are soaked in oil so they think they are sealed when they are not.
With the engine off, you could try removing the oil filler cap when the engine is hot, then restart it. A little vapour is OK, a lot indicates bad valve guides, head gasket,or ring blowby.
Also, try checking inside the exhaust tailpipe. If it is oily sooty it is also an indication of possible ring problems.
Review the maintenance history. How many miles on the engine? Could be the engine is getting tired.

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1 Answer

Hi there, I own a 1979 Austin Mini Cooper, Beautiful car although it always fouls out with the spark plugs?? And not the same one either ?? I'm getting so annoyed at it I just want a straight answer the...


Are the plugs getting fuel fouled or oil fouled? If it is oil getting into the combustion chamber then you are looking at either badly worn cylinders, bad oil rings on the pistons, or bad valve stem seals. If they are getting fuel fouled then your carburetor is dumping way too much fuel into the engine and I would suspect that maybe the float is stuck or not properly adjusted.

Aug 23, 2014 | Cars & Trucks

2 Answers

One plug foul after 200 miles runs ruff


the next time it fouls check the plug when you take it out, if it is covered with oil then you may have a broken ring on the cylinder that is allowing oil to pass through to the combustion chamber and fouling the plug. Or the valves pay be letting oil drain in past the valve seats.

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My 95 tahoe seems to be burning oil. #3 cylinder had a fouled plug. i fixed that but it smokes when i accelerate hard & i dont know where the oil keeps going.


Do a cylinder leak down test

It will possibly tell you if the rings are an issue

The other problem would be valve seals

Apr 25, 2011 | 1995 Chevrolet Tahoe

1 Answer

1997 sonoma fouling plugs


1) Identify the foweling type http://www.gnttype.org/techarea/engine/plugs.html
2) "Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling." This could be your case http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqfouled.asp?nav=31200&country=US
More reading http://www.autotap.com/sparkplugs/ppc_spark_plugs_replace.html
Good luck!

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Eng. shakes spits/sputters oil in spark plugs


I just had this fixed on my suby today. The cause is that the spark plugs, go through the valve covers on the 2.5 l .When the o rings in the cover go, the result is oil in the spark plugs. The cost of the repair in Canada was about $500 including diagnostics as well as new plugs and wires About 1.5 hours labor and new seals and gaskets. It now runs like new. This is a common problem for this subaru engine as well as for the dodge neon.

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Blowing black smoke on acceleration 2.5 exceed turbo intercooler I have a Mitsubishi 2.5 diesel with what sounds to be a similar problem except it happens when you rev the engine suddenly but stops...


1 Inspect Piston Ring Set Worn or broken piston rings. grey_line.gif 2 Inspect Valve Stem Seal Cracked or brittle valve stem seals allowing oil to enter combustion chamber. grey_line.gif 3 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders grey_line.gif 4 Inspect Fuel Injector Rich injector grey_line.gif 5 Inspect PCV Valve Plugged or damaged pcv valve. grey_line.gif 6 Inspect Engine Worn or scored cylinder block grey_line.gif 7 Inspect Piston Worn or damaged piston. grey_line.gif 8 Inspect Valve Guide Worn valve guides

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1 Answer

Flooding out


Hello thank you for choosing FixYa.com here are a few things that would cause the black
smoke and stalling.
1 Inspect Piston Ring Set Worn or broken piston rings. grey_line.gif 2 Inspect Valve Stem Seal Cracked or brittle valve stem seals allowing oil to enter combustion chamber. grey_line.gif 3 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders grey_line.gif 4 Inspect Fuel Injector Rich injector grey_line.gif 5 Inspect PCV Valve Plugged or damaged pcv valve. grey_line.gif 6 Inspect Engine Worn or scored cylinder block grey_line.gif 7 Inspect Piston Worn or damaged piston. grey_line.gif 8 Inspect Valve Guide Worn valve guides

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Car/1990 Toyota Corolla


If Biggy1 has described it right, I think when you remove the WIRE to the spark plug ( not the plug itself ) and oil jumps out, there is a cylindrical seal that needs replacing and one does not need to even remove the cylinder head.
I have the same problem with my corolla. On the other hand if Biggy meant when removing the SPARK PLUG oil was on the contacts....

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