Condensation under valve cover

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Heyarnold

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I recently bought a 2001 gmc Sierra 4.3 v6. The guy said the water pump was bad, happen to be the intake gasket was leaking. While doing this, we decided to replace the valve cover gaskets as well. After removing the driver side valve cover, there was a milky condensation under it. Not a lot though. The passenger side looked fine. The dipstick didn't show any water in the oil. The truck doesn't run rough at all. I don't know how long the truck was sitting before I bought it. I don't know if the heads are damaged or not. Any help would be greatly appreciated.
 
Heyarnold said:
I recently bought a 2001 gmc Sierra 4.3 v6. The guy said the water pump was bad, happen to be the intake gasket was leaking. While doing this, we decided to replace the valve cover gaskets as well. After removing the driver side valve cover, there was a milky condensation under it. Not a lot though. The passenger side looked fine. The dipstick didn't show any water in the oil. The truck doesn't run rough at all. I don't know how long the truck was sitting before I bought it. I don't know if the heads are damaged or not. Any help would be greatly appreciated.
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Start with the simple and add a bottle of http://www.marvelmysteryoil.com/ into your engine and replace your PVC valve for now. Run it till its time to change your oil at 3000 miles, but keep an eye on your oil level. There will be some lost of oil, but the mystery oil will break down any sludge and carbon thats in there.

When its time to change the oil and filter, save some money and dont used synthetic since your engine has high miles already. Here is a link that should help you understand how the new engine oils are now compared to oil in the pass when engines would out last the whole car.

http://gmcowners.com/gmc-forum/showthread.php?t=21201

Good luck and keep us posted. :rolleyes:
Molson02536
 
Make sure your PCV system is fully functional. I replaced the PCV valve in my 1989 truck with the 5.7 engine, but there was no vacuum at the hose connection under the ( single point) fuel injection throttle body at any rpm. I found that the PCV port in the base of the throttle body was plugged solid with carbon . I had to remove the throttle body, and chip out the carbon a piece at a time. It was baked oil vapors, and was hard as a rock.
 
Hi had Chevy 350 do the same and the way i find it i had to a bad rocker going bad on me and i had to remove it once a week come to find out it was the oil i was using i was using Pennzoil so changed to Quaker state and it quit
 
thevoice48 said:
Hi had Chevy 350 do the same and the way i find it i had to a bad rocker going bad on me and i had to remove it once a week come to find out it was the oil i was using i was using Pennzoil so changed to Quaker state and it quit
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changing the brand of oil fixed the rocker? or stopped the condensation?
 
Yes i changed the rocker and changed the brand of oil and it quite and yes i had Condensation under valve cover to but when i changed the brand of oil it quite
 
I went ahead and took off the heads to make sure they weren't cracked. Got everything back today. Everything was good and I went ahead and did a valve job. Hopefully I'll be putting it all back together this weekend.
 
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