Question about 2000 Pontiac Grand Am GT

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Car is throwing water out thru the pcv hole in the valve cover and now has water mixed with oil in the valve covers. Wat could this be?

Water was leaking thru the pcv valve cover and now oil and water is mixed and is in the valve cover and car is overheating. I replaced the thermastat and but coolant but keept on over heating.

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The head gasket is blown

Posted on Apr 15, 2009

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1 Answer

Water mix on taper cover Isuzu KB 280


we dont have KB trucks in uSa, and this is a USA forum.
that is caused, by 2 things,
1: driven short distances, over and over, such that the oil never ever reaches full temperature.
2: or coolant leaked to oil side. (pressure test block>?)
3: or jiPHPHiboobs, put antifreeze in the wrong hole, as they are so famous to do. and worse.
4: PCV system dead. a tuneup and service point on all engines.

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Follow the breather hose(s) to where they meet the engine and that is where the pcv valve is usually to be found if your engine has one; valve cover, crankcase or inlet manifold are the likely locations.

Not all engines use a pcv valve. Many engines just have a tiny hole into the inlet manifold which typically soon blocks and needs cleaning.

Ford was one of the manufacturers who in the early days of a pcv system being required, used an oil filler cap to attach the breather system to and the tiny hole was inside the cap along with the flame trap and oil mist filter.
That like many of the plastic pcv valves was intended to be a throw-away item.

I hope I have helped you a little.

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1 Answer

Replaced pcv valve because oil getting in air cleaner but that didn't fix the problem what else could be wrong?


Make sure PCV valve has good vacuum. Valve cover or covers depending if 6 cyl. or 8 cyl. have to be able to flow air in from air cleaner to valve cover thru engine and sucked back up by PCV system. It is possible that the engine just has to much blow by the engine rings.

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Check and or replace your PCV valve. also make sure the oil level is not overfilled.and your airfilter is not dirty/plugged

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Location of pcv valve 1991 F150 4.9L. Is building base pressure.


The PCV valve goes in a hole in the top of the valve cover, and is connected to a hose. It is the only hole in the valve cover other than the oil fill.

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not a good idea, engines rely on negative pressure(vacuum) for seals on crank and camshaft seals
also for emission standards, sorry

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Poor acceleration and loss of power


If the engine mechanically is good ---no knocking or piton-slapping noises--chances are your engine breather system is plugged up.----possibly plugged up in the valve cover---the tube or hole where the PCV valve is located in the valve cover. check the PCV valve too --when you sake it you should hear it rattle.
To check the valve cover without taking it off --remove the PCV valve and with a piece of hose inserted in it's place inthe valve cover try blowing thru it---( with engine off ) if you can not then remove the valve cover and manually unplug the blockage.

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My 89 jeep wrangler 2.5 4 cylinder has 2 holes in the valve cover. Front is for pcv valve. What is the rear hole for?


One at front usually goes to the air cleaner box...rear one is for pcv valve, but if cover was installed backwards they may be reversed. Pcv hole usually has a baffle inside to keep it from sucking oil into the airstream.

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