Oil in throttle body.

Question edited for clarity and typos.
Question moved to model category.

A major service would not cover what is probably causing this issue. You need to clean the Throttle Body and Mass Air Flow Sensor (MAF). They get dirty with carbon and burnt on oil. It is an easy job to clean as shown in the videos. Make sure you clean both sides.

https://www.google.com/search?q=2005+daewoo+lanos+1.6+clean+throttle+body+and+maf+sensor

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Question edited for clarity and maker.
Question moved to Nissan Altima.

Clean Throttle Body and Mass Air flow Sensor (MAF). Check oil level and top up to the upper line.

https://www.google.com/search?q=2002+nissan+altima+clean+throttle+body

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oil pressure switch faulty

The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.

No has no way to internally get water into engine. Most likely head gasket, in some cars the intake gasket could leak coolant into the crankcase.

My car was doing the same thing, just today I took the day off and my neighbor, which is a mechanic told me that I probably need to clean the Idle control valve. I went to the local auto part store and bought a can of throttle body cleaner and a can of mass air flow sensor cleaner for a total of about $12.00 and he disassembled the throttle body and sprayed the parts for me while I revved the engine and that fixed it. My car now runs great.

Have you had the trouble codes scanned yet? if this car has a manual throttle body, suspect vacum leak somewhere of a bad iac valve.

If this car has an electronic throttle body, suspect the throttle body itself OR sometimes ive seen the rubber boot in front or behind the throttle body rip and cause drivability issues.

Im assuming that there are ni mosfires or any other codes present. Its pretty hard to diagnose a problem like this over the internet but ill help you any way i can.


Keep putting in oil unless you have a pouring leak. Those northstar engines tend to both burn oil as well as leak it from the engines case halves. The only way to reseal the case halves of the engine is to remove it. Its honestly about a 20 hour job so like i said, right now it sounds like adding oil is going to be the way to go.

Stuff like: fresh spark-plugs, air-filter,new engine-oil, oil-filter, fuel-filter, plug-wires, rotor/cap, ( some adjustments may be necessary to the throttle-body and the throttle-body and choke cleaner may need to be sprayed inside the throttle-body).

Remove the idle air control motor (IAC) and clean it well and the hole it comes out of with throttle body spray cleaner, or carburetor cleaner spray. Then re-install and try it. Careful with small "O" ring if it's there, just make sure it's still there when you put it back on.

did you try a daewoo dealer if not check with a GM dealer they make all of the daewoo parts