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Thread Starter
Supreme Member
Joined: Aug 2001
Posts: 1,017
Likes: 1
From: Uppsala Sweden
Car: 1989 Corvette
Engine: 350 Tpi
Transmission: ZF 6 speed
Axle/Gears: Dana 44 3,33
Help
Why is my engine sending blue smoke?
They did a leak down test and nothing wrong , so they changed the valve steam seals and fixed a lightly damaged valve but it still smokes.
It seems to be on cyl number 8 because it has grey ash on the sparkplug, all other sparkplugs looks really nice.
Could it be the head gasket or intake gasket ???
They did a leak down test and nothing wrong , so they changed the valve steam seals and fixed a lightly damaged valve but it still smokes.
It seems to be on cyl number 8 because it has grey ash on the sparkplug, all other sparkplugs looks really nice.
Could it be the head gasket or intake gasket ???
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
A leak-down test only checks the compresion rings, not the oil control rings. It is possible for one to be good and the other bad.
The oil burning possibilities are: Rings, valve stem seals, and intake manifold gaskets.
The oil burning possibilities are: Rings, valve stem seals, and intake manifold gaskets.
Thread Starter
Supreme Member
Joined: Aug 2001
Posts: 1,017
Likes: 1
From: Uppsala Sweden
Car: 1989 Corvette
Engine: 350 Tpi
Transmission: ZF 6 speed
Axle/Gears: Dana 44 3,33
Ok, im going to remove the head since the valve was damaged maybe the valve seat is damaged. That could explain it, im also removing the intake gasket while im at it.