Hose from engine block blowing exhaust!
 

Hi,

One of our work trucks (2006, 5.9L, auto trans, dually 4x4) has exhaust blowing out of a tube on the driver’s side of the engine block. The tube looks like its attached to the block about 1/3 of the way up from the oil pan.

I didn’t get a very good look at it yet but once I get a chance I will try and see if the hose had come off its connector or if it’s a blow by??

For now I was hoping that one of you might know what this hose is for and why it would be blowing exhaust. The truck is running fine with the exception of hard starts when cold.

Thanks for any input you might have.

It runs to the valve cover. Our engines dump crankcase pressure to atmosphere. Sometimes you can get some smoke from it. I would run a compression test on the truck. You may have excess blow-by due to a broken ring or rings or a an injector issue.

Thanks for the reply. Since this is a work truck (global company) I will be sending it to the shop to be looked at. I hope its not rings the engine has only 235K and has been maintained well.

Get it looked at sooner then later! My truck was doing the same thing and I let it go to long and it cost me a short block and new injectors. Cylinders 3,4, and 6 all had burned pistons. Truck actually ran fine until the very end so I never really thought it was as bad as it turned out to be.[duhhh]

So the shop said injector #4 failed and everything else is ok. They said the compression was good by "computer check"?? not sure how they did this as I think the only way to check compresson is to pull the injectors.

They replaced the injector which totaled $1500 including diagnostics checking, gaskets and the such. If this was my personal truck I might have swallowed a CN capsel to avoid the cost.

I have not driven it since it came back from the shop but our driver said that the truck is running good and now starts easily. The exhaust blow by is still coming from the vent tube (the shop did tell me this was still happening after tehy replaced the injector).

I guess we will drive it till something else lets loose.

Thanks