Moisture in the Oil?

I have a 2003 cavalier. somehow moisture gets in the oil (looks like mud) and it backs up through the tube that goes from the valve cover to the air intake tube then down to my map sensor, thus stalling the engine. I know its not a head gasket leak because I had the GM service shop in my town check it out. They left it on a compression tester all night long and said that it was just moisture in the engine. Well this was 3-4 months ago, I just changed my oil 1 month ago and had the same problem, now it is starting to do it again. Does anyone have any clue what could cause this. Also do the 03 ecotec engines have a pcv valve cause I thought it might be that.

Happened to my 1990 3.1 two door CV few years ago coolant leaking inside the engine due to cracked block….hope yours not that and something miner .:)

I have a 2003 cavalier. somehow moisture gets in the oil (looks like mud) and it backs up through the tube that goes from the valve cover to the air intake tube then down to my map sensor, thus stalling the engine. I know its not a head gasket leak because I had the GM service shop in my town check it out. They left it on a compression tester all night long and said that it was just moisture in the engine. Well this was 3-4 months ago, I just changed my oil 1 month ago and had the same problem, now it is starting to do it again. Does anyone have any clue what could cause this. Also do the 03 ecotec engines have a pcv valve cause I thought it might be that.

I sure would like to know if your problem was Fixed and what caused the issue. I have the same problem and wonder if the non PCV issue is the cause. All I have is the tube coming from the Valve cover to the air collector box.

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