Oil Coming Out Of Oxygen Sensor
dmelling
08-10-2005, 06:33 PM
I know this sounds odd, but my Intrepid with the wonderful 2.7 engine, which was replaced with a new one at 38,000 miles started leaking oil. The check engine light came on 3 weeks ago and it pointed to a bad O2 sensor. The oil appears to be coming out of the front drivers side O2 sensor. Does this make sense? I know it does not sounds good. But the car runs fine and no smoke from the exhaust. Any help would be appreciated!
theFREAKnasty82
08-10-2005, 09:53 PM
the only way I know of oil being on the oxygen sensor is if your valve guide seals are leaking around your exhaust valve and it's being pushed out of the cylinders. Have a wet compression test done to the engine to see if you indeed have bad valve guide seals. Even though you don't have any blue smoke coming from the tailpipe, it's possible to still have the seals go bad and leak oil.
spy1309
09-02-2005, 10:59 PM
Wow I have the same problem with my 2000 Intrepid, 2.7l, but the oil does not come from o2 sensor the oil leaks on it.
I am curios how the oil witch go past valve seals gets outside the valve cover of the head to leak on the O2 sensor?does not make any sense to me.
I am curios how the oil witch go past valve seals gets outside the valve cover of the head to leak on the O2 sensor?does not make any sense to me.
theFREAKnasty82
09-05-2005, 10:56 PM
Wow I have the same problem with my 2000 Intrepid, 2.7l, but the oil does not come from o2 sensor the oil leaks on it.
I am curios how the oil witch go past valve seals gets outside the valve cover of the head to leak on the O2 sensor?does not make any sense to me.
All a valve guide seal is really is a gasket. If the gasket goes bad, it'll leak. Oil swivels around in the cylinder head due to oil pressure. That valve guide seal, if it's weak especially around the exhaust valve, will begin leaking oil getting into the cylinder and as the piston is coming up on the exhaust stroke will push it out the valves into the exhuast stream. This would happen a lot more on a 24 valve engine then a 12 valve. There are 2 exhaust valves/cylinder on this car thus twice as much oil can escape as can a car with 1 exhaust valve.
I am curios how the oil witch go past valve seals gets outside the valve cover of the head to leak on the O2 sensor?does not make any sense to me.
All a valve guide seal is really is a gasket. If the gasket goes bad, it'll leak. Oil swivels around in the cylinder head due to oil pressure. That valve guide seal, if it's weak especially around the exhaust valve, will begin leaking oil getting into the cylinder and as the piston is coming up on the exhaust stroke will push it out the valves into the exhuast stream. This would happen a lot more on a 24 valve engine then a 12 valve. There are 2 exhaust valves/cylinder on this car thus twice as much oil can escape as can a car with 1 exhaust valve.
spy1309
09-17-2005, 12:50 AM
Sure dude but how it gets outside the valve cover? The valve cover is in the top of the valves and has a gasket betwen it and cylinder head so how it gets past that? especialy if you don t have any gasket leaks?
theFREAKnasty82
09-18-2005, 09:41 PM
a bad PCV valve or a bad breather hose can cause oil to leak past the valve cover especially if the car was poorly maintained.
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