I think my car has a bad case of blow by... I took the oil cap off and the pcv valve out and revved it up and three was quite a noticable steam coming out... is this a correct test? or could it be a leak of antifreeze in the head gasket or intake because the car does you a little antfreeze... ------------------ 92 z-28 G92 black with white racing stripes. Dynomax cat back Hypertech chip 5 speed

If there was a head gasket problem there would either be oil in the radiator or antifreeze in the oil pan. You could check for that.

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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

hey I have a newly rebuilt engine and when I turn my engine off and take oil cap off I have steam coming out. Whats that mean?

Is it STEAM or SMOKE? Two very different things.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

to me it looks like steam, but its not a lot of it. im almost positive its steam unless its white smoke

Probably just oil vapors, I've seen my van do it but it's a Mitsubishi engine (Dodge). That's what the PCV system is for, so I wouldn't sweat it too much. The best test for blow-by is a compression test.

You really need to run a leak down test to determine if blow by is excessive. A compress test will work in a pinch.