Why do I still have so much blowby? (long)
 

My car burns oil like mad. I've had a leakdown test done and I had close to 30% on 4 of my cylinders. Now I know I'm not going to eliminate blowby but I've tried by putting a breather cap on, nothing. I don't even have oil coming through the breather. I figured it was going through my PCV system because my #8 plug was fouled and that's the closest plug to where the PCV hose runs into the intake. I plugged up the PCV by putting an old coil wire in place of the hose that runs from the PCV valve to the intake to plug it up. I still blow smoke and there is still nothing coming through my breather.

What else can I do? Shouldn't the excess crankcase pressure from the plugged up PCV be pushing oil out the breather?

Thanks.

That sounds like a cylinder head oil sealing problem like worn valve guides or valve stem seals. The only thing you can really do is to install new valve guides and stem seals. Good luck, i hope you figure it out.

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'84 Mustang 5.0 LX
My car