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Post Info TOPIC: Spark plug fouling


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Spark plug fouling


Doing my compression test this winter,pulled all the plugs and number 5 is fouled really bad.  Ido a compression test and compression is actually 20 pds higher than the last time I tested. None of the other cylinders changed. Could this be a stuck valve?



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Sperk plug fouling


The higher compression is probably carbon build up from oil burning. Whats the history on the engine?

Paul

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RE: Spark plug fouling


It was back firing awhile ago due to a vacuum leak and it was doing it on that engine side, it has about 50000 miles on engine.

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Seafoam candidate?



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How is your pcv routed? Could the pcv system be allowing oil to be drawn into the intake manifold and burned by #5 cylinder? I cant say for sure why #5 is burning oil, but I have seen oil from the lifter valley sucked l past the intake gasket. Usually caused by having the cylinder heads planed affecting the alignment of the intake and heads. Could be a valve guide or valve seal problem or a broken or sticking piston ring. If the engine works good other than the plug fouling it wouldnt hurt to try something like sea foam as Cliff suggested to try and clean the carbon out and maybe free up a sticking piston ring.

 



-- Edited by Prefectca on Friday 18th of November 2022 09:36:42 PM

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Ok thanks that may help as I recently moved the PVC valve to that side of the engine. I will switch it back to the other side and see if it makes a difference. I take seafoam is something you pour through the carb to clean it out? The heads are only about 3 years old with maybe 3000 miles on them, Edelbrock street performer heads.

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I personally havent used sea foam but it has good reviews. Perhaps if you do a search on this forum you may find some information. Sea foam is available at Canadian Tire.

https://www.canadiantire.ca/en/pdp/sea-foam-motor-treatment-473-ml-0387800p.html?gbraid=0AAAAADojZpiSVD3uogh72zC-HzBdnJZxT&gclid=EAIaIQobChMInpzD46m5-wIVG_LjBx3kQQGDEAQYASABEgI7jfD_BwE&gclsrc=aw.ds#store=417



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zak404 wrote:

Ok thanks that may help as I recently moved the PVC valve to that side of the engine. I will switch it back to the other side and see if it makes a difference. I take seafoam is something you pour through the carb to clean it out? The heads are only about 3 years old with maybe 3000 miles on them, Edelbrock street performer heads.


 Do you know if there is a baffle inside the valve cover where you moved the PCV valve to?



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oshawacliff wrote:

Seafoam candidate?

Sea Foam comes in a variety of products for gas and oil.  I usually ad the oil product and drive 1000 km before the next oil change.  Just dump a can in the gas tank filler, cant hurt anything.  Seems to work.

Diesel products available also.



-- Edited by oshawacliff on Saturday 19th of November 2022 12:02:56 PM

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The PCV valve is to be in the drivers (left) valve cover. The reason for that is the rotation of the crankshaft causes a buildup of crankcase gasses on that side, and they need to be evacuated. A vent is then provided on the passenger (right) valve cover to replace the evacuated air.

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Yes both sides have baffles in them, I have always have the PVC on the passenger side in the past



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oshawacliff wrote:
oshawacliff wrote:

Seafoam candidate?

Sea Foam comes in a variety of products for gas and oil.  I usually ad the oil product and drive 1000 km before the next oil change.  Just dump a can in the gas tank filler, cant hurt anything.  Seems to work.

Diesel products available also.



-- Edited by oshawacliff on Saturday 19th of November 2022 12:02:56 PM


 Ok will try that in the spring 



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