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Lots of oil in airbox

14TopazZ71

By 14TopazZ71
in Troubleshooting & Recalls

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14TopazZ71 Enthusiast

14TopazZ71

Posted
Posted

Anyone else see this on their truck?  2014, 5.3, 26k miles.  Decided to check the air filter and found it oil soaked and the airbox has a lot of oil in it.

 

Something I should take in or clean it and leave it?  Don't want to pay their $99 fee to be told it's normal, but I do have a Chevrolet extended warranty.

 

Also, I will not be adding a catch can, so we don't need to go down that road.

20200118_163505.jpg

Mike GMC Enthusiast

Mike GMC

Posted
Posted

It's not normal for there to be oil in the air box.  Take it in.  You either have a pcv problem or excessive ring blow by or possibly other intake issues.  It's possible a catch can would help you situation, but it will cure the cause.

  • Like 1
davester Senior Enthusiast

davester

Posted
Posted

 

3 hours ago, Mike GMC said:

It's not normal for there to be oil in the air box.  Take it in.  You either have a pcv problem or excessive ring blow by or possibly other intake issues.  It's possible a catch can would help you situation, but it will cure the cause.

I think you meant "....but it won't cure the cause".

Ag76 Enthusiast

Ag76

Posted
Posted (edited)

I've got a 2015 Sierra 5.3, and a 2016 Tahoe 5.3, and I saw the same thing on both when I replaced the air filters. If you find out what's causing it, please let me know.

Edited by Ag76
Mike GMC Enthusiast

Mike GMC

Posted
Posted
5 hours ago, davester said:

 

I think you meant "....but it won't cure the cause".

Correct.  Thanks for catching that.

14TopazZ71 Enthusiast

14TopazZ71

Posted
  • Author
Posted
5 hours ago, Ag76 said:

I've got a 2015 Sierra 5.3, and a 2016 Tahoe 5.3, and I saw the same thing on both when I replaced the air filters. If you find out what's causing it, please let me know.

I've got to take this in for the latest brake recall and possibly a radiator leak, so I will definitely report back once I do.  Been waiting to go until I confirm the radiator leak.

  • Like 1
  • 5 weeks later...
xSHIFTxNASTYx Enthusiast

xSHIFTxNASTYx

Posted
Posted
11 hours ago, 14TopazZ71 said:

Dealer said PCV valve and replaced. Also did the radiator. ?

Can't beat that, easy fix AND potentially prevented a future issue that wasn't known at the time - the radiator (unless you were having problems with it).

 

Glad you got it taken care of.

  • 2 months later...
14TopazZ71 Enthusiast

14TopazZ71

Posted
  • Author
Posted (edited)

That was short lived.  New filter is coated and air box/duct is full of oil (only been about 800 miles since new PCV and cleaning the oil out).  Will have to make another trip in

20200503_083631.jpg

Edited by 14TopazZ71
  • 5 weeks later...
truckguy82 Senior Enthusiast

truckguy82

Posted
Posted

Wow surprised oil makes it down that path with so much airflow going the opposite way.

 

it’s like turning a vacuum cleaner on and liquid traveling down the pipe.

 

Are you extremely light footed on the throttle without ever going WOT?

 

if I don’t go WOT for awhile I see a lot smoke out of my tailpipe for a couple seconds

14TopazZ71 Enthusiast

14TopazZ71

Posted
  • Author
Posted

Yea, it's pretty wild. I have not been back to the dealer yet, trying to do a little more diagnosis on my end.  The oil is very clean so I'm curious if it's being pushed up there during an oil change or if it's from driving.  Need to get a few more miles on before I decide.

 

I'm not doing anything crazy during an oil change though, just pouring a 5qt jug into a funnel with a .5-.75 inch opening at the end. 

 

Most daily driving is relatively light foot, it spends lots of time in V4.  But then I also tow 5-8klb trailers a fair amount, so it gets worked.

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