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  #1  
Old 11-29-2009, 11:11 AM
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Question oil on spark plugs!!!!!!?????????

I have oil soaked plugs on number 2 and number 3 cylinders. Truck is a 2003 ford ranger 2.3L 5 speed 2wd. Truck does have hesitation here and there. Does not seem to burn oil. How does oil get into the top of the cylinder at a rate to keep the plugs drenched in oil but not burn out the exaust? I'm guessing a some type of seal by the vales? Can't really see in there since the plugs sit way down inside. Anyone else ever have this? I do have a tick as well, maybe a lifter could be stuck causing this?
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Old 11-29-2009, 11:19 AM
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Default one more thing

there is oil on the plug wires as well, so oil is getting into the cylinders and on the plug as well as leaking around the top of the plug and plug wire.
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  #3  
Old 11-29-2009, 12:22 PM
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The hesitation can be cause the oil is fouling the plug

Oil may be getting onto the spark plug due to a broken ring on the piston or the cylinder wall is worn

Oil also can enter into the cylinder by excessive clearance in the valve stem guides or worn valve stem seals. If the PCV valves is not working it can cause a buildup or the engine block pressure. Resulting in ol forced past the rings and valve guides
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Last edited by STL; 11-29-2009 at 12:25 PM.
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Old 11-29-2009, 06:48 PM
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could be wat stl said..bad ring or the cylinderdead or wall is warn causeing oil to seep in. also look at ur valve stems and rockers if u have them. idn if there only on push rod engines or not..not finished my engines class yet. if u want i can talk to my teacher and see what he says?
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  #5  
Old 11-30-2009, 08:28 AM
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Could be a valve cover gasket if its getting oil on the plug wires. Have you changed the spark plugs in it. I have heard of alot of people waiting til they have 100,000 miles to change the plugs (since thats what the book says to do) But some times if you wait til 100,000miles, Then take them out the plug holes are striped out. If thats what you did check that it could be a striped.
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  #6  
Old 11-30-2009, 09:19 AM
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plugs arent stripped, and I've changed them a couple times now, 90k 145k and now at about 160k. The thing does run pretty well, just has what i would describe as a little "jet lag" I was thinking that if the rings were worn the pressure from the combustion would be towards the crankcase more then towards the plug and there for keeping the oil off of the plugs, But what do I know, not much thats why i am on this forum. Thanks for the help though, pcv valve does seem to be an option i need to look into and worn rings would be very likly given the miles.
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  #7  
Old 11-30-2009, 09:43 AM
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start small and work your way to bigger things

The head is easy to remove and to inspect the cylinder walls
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  #8  
Old 11-20-2011, 07:38 AM
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Default Re: oil on spark plugs!!!!!!?????????

I also have the 03 2.3 2sd 5 speed ranger, and in my opinion it is the best due to the dual over head cams removing the lifters and push rods... meaning less moving parts. just did my 199k mi oil change and went to replace the spark plugs noticing that cylinder 3 has oil covering the plug, i have heard both reasons (cylinder, and valve cover gasket) but my main concern is the O2 sensor in the back catalytic converter aka the catalist manifold sensor. is there any way to bypass this sensor and remove the cat? if you can please help that would be great... thank you
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  #9  
Old 11-20-2011, 08:04 AM
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Default Re: oil on spark plugs!!!!!!?????????

Quote:
Originally Posted by dangerranger2003 View Post
I also have the 03 2.3 2sd 5 speed ranger, and in my opinion it is the best due to the dual over head cams removing the lifters and push rods... meaning less moving parts. just did my 199k mi oil change and went to replace the spark plugs noticing that cylinder 3 has oil covering the plug, i have heard both reasons (cylinder, and valve cover gasket) but my main concern is the O2 sensor in the back catalytic converter aka the catalist manifold sensor. is there any way to bypass this sensor and remove the cat? if you can please help that would be great... thank you
Does your state do emissions? If you remove the 02 sensor and the cat you could incur a rich problem and gas mileage will go out the window.
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  #10  
Old 11-20-2011, 08:52 AM
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Default Re: oil on spark plugs!!!!!!?????????

Quote:
Originally Posted by zbinck2.3 View Post
Could be a valve cover gasket if its getting oil on the plug wires. Have you changed the spark plugs in it. I have heard of alot of people waiting til they have 100,000 miles to change the plugs (since thats what the book says to do) But some times if you wait til 100,000miles, Then take them out the plug holes are striped out. If thats what you did check that it could be a striped.
Are the plugs fouled with ash? I'm thinking zbinck might be on to something. If you aren't burning oil and the plug electrodes are clean, then oil might be dripping from the top and settling on the plug tops/threads and messing up the wires and boots. Replacing the valve cover gasket might be what is needed. I did so on a Mitsubishi my wife had when we met. Oil was everywhere. I cleaned the engine, replaced the valve cover gasket, and everything was back to normal. I did a similar job on my brother-in-laws Celica. The best thing is that the fix was pretty easy and quick. Maybe it will be for you Rooster.
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  #11  
Old 11-21-2011, 04:38 PM
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Default Re: oil on spark plugs!!!!!!?????????

i found out it is the valve cover gasket. there are two, one around the outside and one on the inside that goes right around the spark plugs and the temperature sending unit between 2 and 3. the inner gasket was very hard and warped letting the oil seep down on top of the plugs. now after all that im reading the code p2004 that says i have a intake manifold runner stuck open.... not to sure what this means...
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  #12  
Old 01-23-2012, 04:36 PM
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Default Re: oil on spark plugs!!!!!!?????????

Quote:
Originally Posted by dangerranger2003 View Post
i found out it is the valve cover gasket. there are two, one around the outside and one on the inside that goes right around the spark plugs and the temperature sending unit between 2 and 3. the inner gasket was very hard and warped letting the oil seep down on top of the plugs. now after all that im reading the code p2004 that says i have a intake manifold runner stuck open.... not to sure what this means...
I will almost guarantee that the intake manifold runner problem is a broken vacuum hose. Same thing happened on my 2003 2.3l. the hose makes a really sharp bend that's prone to breaking. Its really just a bad design, so I got a length of replacement hose about an inch or two longer to correct it. Here's a pic:
Its low on the right side of the engine, the bad hose is labelled '2' in the picture.
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