Water is getting in the oil, just put on a new water pump. What can be wrong now? on 2003 Chevrolet Venture

Just started last week. Leak under van replaced water pump, changed oil and filter. Looks like oil may have some water in it. Checked engine cold it's ok, after running for a few minutes looks like may be water in it.How can we find out what's wrong without costing an arm and leg. We're on a fixed income.

Asked by for the 2003 Chevrolet Venture
the 3.4 engines are known for leaking intake gaskets. take a bright light and look along the edges of the heads on the engine. Look for wet spots running down the enginge block . Also do a compression test to be sure problem isn't in the head gaskets
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sounds like a head gasket possibly. get a compression check done