need help identify source of vac leak (smoke test video)

[shevin]

Update: I finished changing the oil return hose and cleaned the throttle body and idle Valve

Note that I did not change the upper hose or the CCV. But now my car makes white smoke and it’s very embarrassing…. Can’t drive it.

My question is why it did not smoke before changing the oil return hose ?

My theory is the old oil return hose was so melted that wouldn’t let any oil be vacuumed up ,,, and that means I need to replace CCV itself … am I right ?

[X5chemist]

Try this CCV test when it's hot. If the CCV is stuck, it will suck in extra air and fumes. It is possible the oil drain line was so clogged it couldn't suck vapors. Miss fires and lean codes are also possible with a failed CCV diaphragm. Mine had old miss fires and lean codes. They went away with new plugs and coils. Every now and then, it would record misfires but not set the engine light. Since replacing the CCV system, no misfires or other codes have been present.

[andrewwynn]

Excess vacuum in the crankcase? Pull the dipstick and see if the oil burning goes away. Too much crankcase vacuum will pull oil past the VSS.


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[shevin]

Originally Posted by X5chemist

Try this CCV test when it's hot. If the CCV is stuck, it will suck in extra air and fumes. It is possible the oil drain line was so clogged it couldn't suck vapors. Miss fires and lean codes are also possible with a failed CCV diaphragm. Mine had old miss fires and lean codes. They went away with new plugs and coils. Every now and then, it would record misfires but not set the engine light. Since replacing the CCV system, no misfires or other codes have been present.

@X5chemist


in this video he also says EXACTLY same thing as you,
he says if I seen clogging in the hose, i would need to "Drain Back Pipe", (min 9:35)
https://www.youtube.com/watch?v=amHwxoFAl7I

What does it mean to Drain the Back Pipe, because thats what happened to me, the Return Hose was Melted and I dont think anything was going down there I didnt see any Mayo in the ends of it but it was so Melted it was not really a hose anymore.

so what do I need to do for "Draining Back Pipe", I really hope this be the Solution so I dont have to change the whole CCV.