I have a 2002 Tahoe 5.3L with 247k miles. Over the last 1,000 miles or so, it's had a little hesitation and slightly rough idle. I checked the PCV and it was a Fram plunger style. It had a good bit of gunk on it and in it.
I replaced it with a fixed orifice unit (BWD #PCV-484) and the idle is smoother and engine seems to run smoother and quieter overall. I used to have a slight hissing sound before that I wasn't sure where it was coming from. It's now gone with the PCV change.
I read a couple threads mentioning the fixed orifice valve over the plunger type. What's the "science" behind it? Does the fixed orifice pull more or less on the crankcase at idle and part-throttle compared to the plunger? What difference should I see in oil consumption? (currently uses 1 quart every 5-6k miles)
I replaced it with a fixed orifice unit (BWD #PCV-484) and the idle is smoother and engine seems to run smoother and quieter overall. I used to have a slight hissing sound before that I wasn't sure where it was coming from. It's now gone with the PCV change.
I read a couple threads mentioning the fixed orifice valve over the plunger type. What's the "science" behind it? Does the fixed orifice pull more or less on the crankcase at idle and part-throttle compared to the plunger? What difference should I see in oil consumption? (currently uses 1 quart every 5-6k miles)