Blowby at idle
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Joined: Feb 2006
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From: Albuquerque, NM
Blowby at idle
My truck since I bought it was 160k has had steam coming from the blowby tube at idle. I've never figured out why, but even if I pinch off the Vacuum line at the pump it does not change. I will only lose oil if pulling at high rpm.
I stopped the oil loss a couple years ago by putting a vent up off the oil fill tube with a barbed fitting, some JB weld, and some 1/2 hose. I never really lost oil (maybe 1/2 quart in the catch bottle I had or so over 10k miles). I got tired of the steam being up front and varnishing the engine bay so I capped and moved it back. I tried putting in a home-made seperator, but it did not flow enough and caused me to cover my fender with oil blowing from the dipstick tube. I ditched that. Now I've been running the vent I made and the stock tube for a month or two, but after a hard run it just hazes at idle and it drives me nuts.
Today I received one of those dual valve cover breathers and replaced two valve covers with this device. I plugged the other two breather tubes. All this device did was move the haze up to the top of the motor. After idling for a few (truck was cold) it started the hazing again, and within a few minutes I could stick my finger in the vent hole and wipe out oil onto my finger.
What is odd is that if I rev up the motor I can feel the pressure become less, and then as it falls back to idle the pressure increases. I pinched off the vac hose again and no change.
It looks like steam, no blueish tint, looks like a tea pot on the stove blowing steam out of the spout.
I don't get it?! I am tired of this but I'm in over my head on this one. Any ideas? Truck runs great and tows my 10k# 5th wheel no sweat. 30lbs of boost and cleans up nice if you stomp it.
I stopped the oil loss a couple years ago by putting a vent up off the oil fill tube with a barbed fitting, some JB weld, and some 1/2 hose. I never really lost oil (maybe 1/2 quart in the catch bottle I had or so over 10k miles). I got tired of the steam being up front and varnishing the engine bay so I capped and moved it back. I tried putting in a home-made seperator, but it did not flow enough and caused me to cover my fender with oil blowing from the dipstick tube. I ditched that. Now I've been running the vent I made and the stock tube for a month or two, but after a hard run it just hazes at idle and it drives me nuts.
Today I received one of those dual valve cover breathers and replaced two valve covers with this device. I plugged the other two breather tubes. All this device did was move the haze up to the top of the motor. After idling for a few (truck was cold) it started the hazing again, and within a few minutes I could stick my finger in the vent hole and wipe out oil onto my finger.
What is odd is that if I rev up the motor I can feel the pressure become less, and then as it falls back to idle the pressure increases. I pinched off the vac hose again and no change.
It looks like steam, no blueish tint, looks like a tea pot on the stove blowing steam out of the spout.
I don't get it?! I am tired of this but I'm in over my head on this one. Any ideas? Truck runs great and tows my 10k# 5th wheel no sweat. 30lbs of boost and cleans up nice if you stomp it.
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Joined: Dec 2003
Posts: 14,672
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From: Montana
If you're not using more than a quart of oil every 1000 miles don't worry about it.
Probably mostly steam from condensation in the engine usually caused by short trips where the engine doesn't fully warm up.
Probably mostly steam from condensation in the engine usually caused by short trips where the engine doesn't fully warm up.
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