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Locating Pcv Valve On Vortec 6.0l V8. 2007

tcalb2

By tcalb2
in Ask A GM Technician

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tcalb2 Enthusiast

tcalb2

Posted
Posted

I'm getting the P0300 and P0430, some where online it suggests cleaning or replacing PCV valve but I'm not sure where mine is on my truck does anyone have any diagrams and links to webpages with them, thanks.

tcalb2 Enthusiast

tcalb2

Posted
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Thanks guys for the info. I have to do a seal on the rear axel tomorrow morning and I'll see if I can clean out the valve. I'm hoping its not the cats that I need to replace. However I think their under warranty b/c I have 75k on the truck.

tcalb2 Enthusiast

tcalb2

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I thought I would update. I was driving up the highway , check engine light flashed and the truck wouldn't go over 40mph. I pulled over and had the truck towed to the local dealer. They called and said I had a bad valve in the head. So their currently waiting on parts to replace the head under the power train warranty. I wasn't thinking that was were this was going to go.

redvett Senior Enthusiast

redvett

Posted
Posted

Any GM truck with DBW has no PCV its a fixed orfice restriction located in the drives side RA cover at the rear. Its a no maintance item and has no bearing on P0430 or P0300.

tcalb2 Enthusiast

tcalb2

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Thanks, I was wondering why my parts store said they didn't carry any PVC valve for it. I was just surprised about the head having problems, at such a low mileage. Is this a defect in the design of these motors?

redvett Senior Enthusiast

redvett

Posted
Posted

The fixed orifice was introduced when DBW started production to reduce oil vapors going to the TB to alleviate coking around the throttle blade and allowing the throttle to close without sticking. The cylinder head isn't a problem.

 

Thanks, I was wondering why my parts store said they didn't carry any PVC valve for it. I was just surprised about the head having problems, at such a low mileage. Is this a defect in the design of these motors?
markw8 Enthusiast

markw8

Posted
Posted
The fixed orifice was introduced when DBW started production to reduce oil vapors going to the TB to alleviate coking around the throttle blade and allowing the throttle to close without sticking. The cylinder head isn't a problem.

 

Thanks, I was wondering why my parts store said they didn't carry any PVC valve for it. I was just surprised about the head having problems, at such a low mileage. Is this a defect in the design of these motors?

 

 

What is DBW?

 

Mark

redvett Senior Enthusiast

redvett

Posted
Posted

DBW is the electronic throttle, there is no cable from TB to the peddle.

 

The fixed orifice was introduced when DBW started production to reduce oil vapors going to the TB to alleviate coking around the throttle blade and allowing the throttle to close without sticking. The cylinder head isn't a problem.

 

Thanks, I was wondering why my parts store said they didn't carry any PVC valve for it. I was just surprised about the head having problems, at such a low mileage. Is this a defect in the design of these motors?

 

 

What is DBW?

 

Mark

 

tcalb2 Enthusiast

tcalb2

Posted
  • Author
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just spoke with the shop, they did the head already. They said the previous owner altered the exhaust causing the cat to fail prematurly. They replaced the cat and want me to pay the 1200 to replace everything past the cat to make it factory again. I told them to go ahead. They said that the blocked bad cat caused the valves to get screwed up. IDK

  • 3 years later...
one03sierra New Member

one03sierra

Posted
Posted

Any GM truck with DBW has no PCV its a fixed orfice restriction located in the drives side RA cover at the rear. Its a no maintance item and has no bearing on P0430 or P0300.

actually there are drive by wire gm trucks that have pcv valves. I have an 02 avalanche that is dbw and an 04 Silverado that is dbw. both have pcv valves.

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