- Dec 4, 2011
- 12,927
My coworker has a 2007 Trailblazer LT 4.2L with 251k miles. She said recently that it has been hesitating badly when pulling away from a stop. OK, clean the throttle body, I've been down that road before.
Now the thing is she said oil consumption has gone way up recently where she's having to add a quart of oil between changes, and she still does the every 3-5k miles with conventional (at the dealer). When I pulled the intake resonator the little L shaped hose that connects to the top of the valve cover was covered in oil. It is also cracked a bit, so it should be replaced. But that intake resonator was loaded with tons of oily goo, enough that I was actually dumping it out.
We went ahead and cleaned the throttle body and it is running great again. That said, something has to be causing that much oil to be getting sucked through the intake that badly. My old 2002 with 215k miles never had enough oil in the resonator to actually flow or pool anywhere, just had a oily film coating inside.
What could be a cause of this much oil in the PCV? I'm thinking possibly excessive blowby from worn rings, but maybe something else I'm not thinking of.
Now the thing is she said oil consumption has gone way up recently where she's having to add a quart of oil between changes, and she still does the every 3-5k miles with conventional (at the dealer). When I pulled the intake resonator the little L shaped hose that connects to the top of the valve cover was covered in oil. It is also cracked a bit, so it should be replaced. But that intake resonator was loaded with tons of oily goo, enough that I was actually dumping it out.
We went ahead and cleaned the throttle body and it is running great again. That said, something has to be causing that much oil to be getting sucked through the intake that badly. My old 2002 with 215k miles never had enough oil in the resonator to actually flow or pool anywhere, just had a oily film coating inside.
What could be a cause of this much oil in the PCV? I'm thinking possibly excessive blowby from worn rings, but maybe something else I'm not thinking of.