gutted cats, now using oil? WTF?
11-20-2005, 04:36 PM
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gutted cats, now using oil? WTF? The car never used a drop of oil until now. I gutted the cats on Tuesday and went on a 600 mile trip this weekend, and the low oil light came on when I was almost home. Checked it and it was a little over a quart low. Only got about 2K miles on it since the last oil change (Mobil 1, 10W30) with the larger Delco filter. I put 6 qts in at the last change. Maybe I'm having a brain fart, but I can't see any reason that it should be using oil after gutting the cats and putting o2 sims on.
11-20-2005, 05:21 PM
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If you got on it a lot, the increased WOT air draw
from less exhaust restriction (better cylinder filling)
could have pulled more PCV air / oil mist through.
But this you'd think would be only a matter of degree.
I saw only about a 10%-range improvement in cylinder
air from gutting. Which might however raise the
vacuum level behind the MAF, at WOT, by more.
Look for signs that it's being sucked up that way?
from less exhaust restriction (better cylinder filling)
could have pulled more PCV air / oil mist through.
But this you'd think would be only a matter of degree.
I saw only about a 10%-range improvement in cylinder
air from gutting. Which might however raise the
vacuum level behind the MAF, at WOT, by more.
Look for signs that it's being sucked up that way?
11-20-2005, 07:32 PM
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I'll have to wait until tomorrow to pull the MAF and see what I can find. I was on the throttle quite a bit trying to make up some time on the trip, passing cars and such, and just the usual daily driving, but I wouldn't think it'd pull that much oil in less than a week.
11-21-2005, 12:55 PM
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You'd see a snail track in the TB coming off the
"fresh air" PCV port, if draw there was the problem.
The MAF's only contribution is, its restriction will
create a soft vacuum before the throttle blade
relative to crankcase, and the unmetered "fresh
air" line then can run backwards drawing up oil
fog.
Somebody ought to start making dual-line catch
cans, that look nice (or better yet invisible/OEM)
for our PCV system.
"fresh air" PCV port, if draw there was the problem.
The MAF's only contribution is, its restriction will
create a soft vacuum before the throttle blade
relative to crankcase, and the unmetered "fresh
air" line then can run backwards drawing up oil
fog.
Somebody ought to start making dual-line catch
cans, that look nice (or better yet invisible/OEM)
for our PCV system.
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11-21-2005, 01:26 PM
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Cool. I'll check for that this evening after work. If there's no oil there, I don't know what it could be. But it sounds like a pretty common problem. I just never had this issure before now.