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2005 Chevy Silverado

hotcars79@yahoo.com

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hotcars79@yahoo.com Enthusiast

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I own a 2005 Chevy Silverado 5.3L. The problem I am having is that when I first start the engine I get blue smoke which is oil burning. After about 10 seconds it clears up and no more smoke. I just replaced valve guide seals, and still have the same problem. Is there any other way that the oil can be getting in somewhere to cause this problem? Can it be from the EGR valve or EVAP solenoid. I'm at a loss here and running out of options.

Zembonez Senior Enthusiast

Zembonez

Posted
Posted
I own a 2005 Chevy Silverado 5.3L. The problem I am having is that when I first start the engine I get blue smoke which is oil burning. After about 10 seconds it clears up and no more smoke. I just replaced valve guide seals, and still have the same problem. Is there any other way that the oil can be getting in somewhere to cause this problem? Can it be from the EGR valve or EVAP solenoid. I'm at a loss here and running out of options.

Others may correct me if I am wrong here but I have not heard of anybody with 5.3 smoking issues. If you are not consuming oil but are getting a blue puff on startup, it almost has to be in the heads somewhere. This used to be common on high mileage older generation 4.3, 5.0 & 5.7s because of worn valve guides leaking oil into the cylinders when the engine was shut off.

Draenor Senior Enthusiast

Draenor

Posted
Posted
Others may correct me if I am wrong here but I have not heard of anybody with 5.3 smoking issues. If you are not consuming oil but are getting a blue puff on startup, it almost has to be in the heads somewhere. This used to be common on high mileage older generation 4.3, 5.0 & 5.7s because of worn valve guides leaking oil into the cylinders when the engine was shut off.

+1 Its normally the valve stems seals, or worse the valves them selves.

DofD Senior Enthusiast

DofD

Posted
Posted

This certainly sounds like what happens with worn valve guide seals. Had this happen on my '90. Valves not seating right on the new seals? Could it be a problem with one of the values itself?

Zembonez Senior Enthusiast

Zembonez

Posted
Posted

Once the valve guides are worn, it allows the valve to move laterally and the seals can leak (even if new). The seals are designed to sweep oil off of the valve stem during up and down movement.

silveradobobby Enthusiast

silveradobobby

Posted
Posted

Acually I'm seeing 5.3 with valve guide issues and causeing your problem. Its the seals or a guide in a head, sounds like its just one of the heads it has a weak guides I have been seeing on the older 5.3.

txab Senior Enthusiast

txab

Posted
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Consensus has been achieved. :thumbs:

 

A valve job is in order whenever you feel like it.

Alljackedup408 Enthusiast

Alljackedup408

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if my truck sits for about a week.. then i start it.. i get the puff of death smoke...lol. but every day starting... never noticable. the valve guides are leaky leaky i do believe =) but.. its not more than a drop so... im not worried.

hotcars79@yahoo.com Enthusiast

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So even if the valve guides are new it can still leak down? :lol: Could it be the valves themself not closing all the way.The motor has 76,000 on it.I just changed the oil two weeks ago and I had to add 1qt of oil already.Somedays it smokes evertime I start it and somedays not at all.

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

I am reaching here but thought I would ask. Have you recently replaced the PCV valve? Your truck should have a "fixed orfice style" PCV valve and not the style with valve. The early model 5.3s had the valve style and they did allow some oil to be recirculated which is not what you want.

 

Check it out, make sure it is a fixed orfice style and that it is free and clear in there.

 

The amt of oil you just had to add in such a short period of time sounds like too much to be valve seals. My 1971 may puff just a little at start up but I never have to add any oil. It has the original seals and is 38 years old. I can't complain.

txab Senior Enthusiast

txab

Posted
Posted

You replaced the seals. Having worn guides or valves is different. This was mentioned in an earlier post. You're burning a small amounts of oil while you're driving. It's just noticed when you start-up after sitting for a bit. I've got a 350 that needs a valve job due to worn guides/valves.

 

Is the oil useage the same, more or less than before you replaced the seals? If it's more, you may have not gotten them on correctly

 

 

+1 on the PCV.

 

I'm sure you would've noticed while the covers were over, oil drain back holes all open?

Quik Enthusiast

Quik

Posted
Posted

before you go spending crazy money. Gm has the worst PCV system ever. fact is it suck in oil and then the oil rests inside the intake. when you go to start the truck up in the morning it will smoke some. I been moddign this motors for years now and never once ever seen a bad valve guide.

silveradobobby Enthusiast

silveradobobby

Posted
Posted

Yes check the pcv system first to make everyone happy. If thats not the case then fix the guides I see 2-4 of these engines a day in the shop and YES lots of them have bad guides!

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