Oil mysteriously disappearing.
Thread Starter
Junior Member
Joined: Apr 2004
Posts: 91
Likes: 0
From: Sacramento, CA USA
Car: '91 Pontiac Firebird
Engine: 4-bolt 350 TBI w/ Holley ProJection
Transmission: T-5
Axle/Gears: 3.08, 10bolt
Oil mysteriously disappearing.
Yeah, at a rate of a whole quart every 2 hours of running.
No apparent leaks on the outside of the engine, no oil in the coolant, no coolant in the oil, it just... disappears... I can smell it burning off, but I have no idea where it's going.
This is Castrol SynTec 10w30 in my 4-bolt 350 with a whole 17k miles on it. Any ideas?
No apparent leaks on the outside of the engine, no oil in the coolant, no coolant in the oil, it just... disappears... I can smell it burning off, but I have no idea where it's going.
This is Castrol SynTec 10w30 in my 4-bolt 350 with a whole 17k miles on it. Any ideas?
Joined: Sep 2004
Posts: 2,777
Likes: 7
From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Have you changed the intake lately?
I had that problem before with a different engine and it was my intake gaskets leaking from the inside. They allowed the engine to suck a lot of oil from the lifter valley straight into the intake ports!!
Good luck finding your problem!!
I had that problem before with a different engine and it was my intake gaskets leaking from the inside. They allowed the engine to suck a lot of oil from the lifter valley straight into the intake ports!!
Good luck finding your problem!!
Thread Starter
Junior Member
Joined: Apr 2004
Posts: 91
Likes: 0
From: Sacramento, CA USA
Car: '91 Pontiac Firebird
Engine: 4-bolt 350 TBI w/ Holley ProJection
Transmission: T-5
Axle/Gears: 3.08, 10bolt
Have you changed the intake lately?
I had that problem before with a different engine and it was my intake gaskets leaking from the inside. They allowed the engine to suck a lot of oil from the lifter valley straight into the intake ports!!
Good luck finding your problem!!
I had that problem before with a different engine and it was my intake gaskets leaking from the inside. They allowed the engine to suck a lot of oil from the lifter valley straight into the intake ports!!
Good luck finding your problem!!
You know... I did... lol
Hopefully I can rectify the problem by just tightening down the bolts...
Thanks for your insight!
Valve Covers/OP switch aren't leaking. No visible leaks.
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