smoke and oil spitting out of oil fill hole and a large ammount of air coming out. this is a 1991 jeep yj with a 2.5l inline 4. manual tranny. what does this mean. also it laks power severly. barely get it up to 100 km/h
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Sounds like a bad head gasket or a bad set of rings I would recommend removing the valve cover and looking around to see anything you may just have to remove the Head you can do a compression test before you remove anything wouldn't hurt.
sounds like blow-by. check the pcv valve. it could be plugged up or the hose going to it.
A little wisp of smoke is okay, but not the pressure.. Sounds like you have a leaking head gasket that is allowing some of the power from the combustion chamber to escape into the crankcase. Get the cylinders pressure checked & see if it confirms a leaking head gasket.
First thing I would check is the Positive Crankcase Ventilation valve.
If this valve becomes clogged, it can cause excessive blow by gases and also cause fouling of the air intake with oil.
It would also be to your benefit to clean the EGR valve as shown below:
EGR & PCV Symptoms & Testing
Rough idle
Hard Starting
Cruise Control Surges
Popping noises from the exhaust
Backfiring & Sudden Engine Stops with cold weather or after deceleration.
Oil in Air Cleaner
Rich Fuel Air Mixture
Excess Fuel Consumption
A bad PCV valve can cause excessive oil leakage and consumption. A PCV valve helps relieve pressure in the crankcase. If the PCV valve malfunctions, crankcase pressures can increase, forcing oil through seals and gaskets.
A buildup of pressure in the crankcase due to a faulty PCV valve also pushes water vapor through the breather element. A breather element is a filter used to trap excess oil from the crankcase system. This water vapor, mixed with combustion gases, leaves hydrocarbon and oil deposits on the air filter, which may result in greater fuel consumption and the need to clean or replace the air filter.
A bad PCV valve may stick or not close properly. This allows an excess of oxygen to enter the combustion chamber. Excess oxygen dilutes the air/fuel mixture ratio, causing a "rich" fuel mixture. A rich mixture can lead to a build up of back pressure in the exhaust system, which can cause engine stalling and a decrease in overall engine performance.
See links below for additional information on how to check and clean these valves.
Compression leak, bad cylinder. Blown head gasket? Cracked head? Rings blown in one cylinder?
Is the engine blowing blue or white smoke out of the exhaust as well? Blue is rings (burning oil) and white is head gasket (burning coolant)
get it compression tested.
Along with what others have said, also check your PCV valve, it gets plugged up and can cause these problems. It sucks air into the manifold, pulling cooler air from the air filter and thus removes the smoke from the engine. Under high speed, the pcv closes, and the air goes backwards into the air filter, being pulled in be engine vacuum.
But if the pcv is plugged, then it cannot remove the smoke and pressure, and so it then takes another route, through the filler cap.