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Quote:
I bought this 1994 chevy brand new in that year.It has a 350 tbi with 160,000 miles. I need to talk to a chevy group that may be able to help me fix my truck.The dipstick shows a very milky looking oil.
I did a combustion leak detection test with the fluid and ran the engine for 15 minutes.The fluid stayed blue all the time,never changed to yellow.The temp gauge barely reached half way,never got hot. I am suspecting a bad intake manifold gasket.
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If just the mix is on the upper end of the dipstick (and the dipped oil is not milky) and possibly under the oil filler cap, it sounds more like a non-functioning PCV SYSTEM.
Also, if the engine does not come to proper operating temperature, (coolant), it magnifies the problem.
The test you performed was only to find any combustion gases in the coolant. You would need to perform a cooling system pressure test to see if the system holds pressure.
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