Question about 1990 Jeep Wrangler

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Oli leaking 1990 yj

My 1990 jeep yj is leaking oil it looks like its down near the trans and i am freaking out. it is smoking. it was running really rich so we cleared out the carb and it was doing ok now today it is just blowing oil but when checking the oil level it seems ok still. it is making me crazy, help a girl out please i dont even know where to begin. could it be that the oil is too thick as the pressure is high and so it is maybe just actually spitting it out????

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  • Samuel Charles Spriggs May 11, 2010

    If the oil level on the dipstick is not changing, it's probably not an oil leak -- more likely a transmission/axle fluid leak which is getting onto exhaust & burning/smoking. Is any of this dripping to the ground such that you could put white paper under it and check the color & consistency of the fluid leaking? Charlie

  • CarySchroeder May 11, 2010

    First off, take a deep breath. Now, unlikely that oil is too thick. Where is it "blowing oil" at? My first thought is a bad pcv valve or some type of vacuum issue. Cleared out the carb - what exactly was done here - just spray some carb cleaner down the carb throat? Oil leaks tend to run downhill, and often drip over the transmission and on to the exhaust pipes, where they will burn off and smoke. I'd resolve the blowing oil issue first, give the oil time to "drip dry" and see if any other issues arose. Other than smoking and blowing oil, how is the engine running? Smooth, rough? How is gas mileage, any significant change? (Good reason to monitor gas mileage is to catch a problem as it creeps up.) I am submitting this as a clarification so others see the question and can put forth more detailed suggestions.

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Could be a couple of places probably valve cover gasket,but could be oil filter loose,oil pressure sensor loose letting oil leak on the exhaust system cause it to smoke.

A little oil on an exhaust will smoke alot.

Track the wet oil trail up the motor to its source you might have to go to a car wash and clean engine and then watch for fresh oil

Posted on Sep 27, 2009

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First, check to see what kind of oil is dripping. Engine oil is brown, auto trans fluid is usually red. Oil dripping at the bottom does not always mean that's where it is coming from. You will need to actually "get an eye" on the leak source. Even if your oil pressure was 100psi, it would not cause anything to leak, neither will thick oil so forget that. If you have a pcv valve or ccv ported valve on your engine and it is malfunctioning or the vacuum line to it is plugged, that will cause excessive crankcase pressure to build up and that can force oil past seals.You could also have a broken piston ring...that would cause the problem as well but would cause an engine miss and excessive oil residue on one spark plug. Ring or cylinder wear will cause excessive blowby (crank pressure above what the pcv or ccv can handle) but this would happen over time, not just happen all of a sudden. If the venting system is pluged, it can cause seal problems. Most times if the problem is corrected the leak caused will either stop or get considerably less. If the engine was running rich, likely the oil has been contaminated with fuel. This will not cause your current problem but, the oil should be changed to prevent new failures. I suggest you use a good quality oil with rating of 10w 40 and use an engine additive such as lucas conditioner and sealer, which will help soften the seals and slow down any leaks. If you find it is leaking from the valve cover gasket, most times you can slow it down by gently re-tightening the screws, or replacing it.
Any problems along the way, just ask.
Good luck!

Posted on Sep 26, 2009

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Look for leaks high on the engine, like valve cover gaskets...

High oil pressure, if you actually had that, would not necessarily exit the engine....Crankcase pressures are not related to system pressure, per se.

Get a mirror and inspect very carefully.. Sometimes you have to clean the engine and test again, as air blows leaks all over (while driving...)

Posted on Sep 25, 2009

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