I have a 96 4x4 blazer. I found this hose disconnected and I noticed inside it this discolored oil like substance. (FYI: the discolored substance is not in the actual oil). Any idea where its comming from, what it is, and also what is that hose? What does it do? (FYI: I leak a bit of coolant but I am unsure where it leaks from. Attached are pictures of the hose with the discolored oil substance in it.

And also, my car has been stalling out sometimes when I am idling. Like I have to keep giving it a bit of gas sometimes when im at a stoplight. Would this have anything to do with it?

 

you get that when oil and water mix together, the moisture is probably just from condensation that formed in the line (especially if that line has been disconnected). That line is your crankcase breather i believe, it just helps remove combustion gases from the crankcase so not uncommon to find oil in it and it also helps remove moisture from the engine. I would look under the oil cap to and see if its there also, if there isn't any i would just connect the line back up and not worry about it. Probably wouldn't hurt to do an oil change if it was disconnected for a while.

And yes it would greatly affect your idle, you have a huge vacuum leak basically behind the mass air sensor and it would cause the engine to run very lean, because That air is not accounted for by the ecm. you may also want to find your coolant leak and fix it.

 

The hose connects to the hose nipple next to it in the middle picture.

 

yep right there on the back of the intake hat.

 

does it do a lot of short trips ?
I usually see that in cars that are only drive short trips
Its like the oil sweats

You can try a can of engine flush in the oil just before the next oil change
Beware the flush can loosen up other crud and cause other issues

 

I guess I should have clarified, I know where it's supposed to go. I just didnt know what it did.

I put the hose back on (allthough it seems like its a bit of a loose fit) but my car still sputters and even stalls sometimes. Maybe it neede to be ziptied? I will get an oil change and zip tie it and see if it still does that.

Also, my car does normal trips here and there some even long.

I feel like its from one of the throttle cables (,that attach to the throttle body) being too loose and leaving the throttle body almost completely closed.

I guess I should mention that when I take off from a stop sometimes it sputters and it often catches up with its self and drives normal after about 3 seconds of hesitation, but sometimes it will just stall also.

 

Thanks for the advice! No that substance isnt under my oil cap. My oil is clean. I will ziptie that up right away so its nice and secure!

 

The tube runs to the passenger side rocker arm cover and is the filtered inlet for the PCV system. While the engine is running, there should be a very slight vacuum on the end in the image.