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02-28-2012, 09:25 PM

WyoWagner

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Join Date: Feb 2012

Location: clayton nm

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Year: 1988

Model: Cherokee

Engine: strait 6

Blow by

ok so on my 1988, inline 6, i had blowby coming from the front hose into my air filter i replaced the valve cover with one out of a 96 and i replaced the oil pump and the oil sender. now its leaking oil from the oil cap. besides a broken ring what can cause this.

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02-29-2012, 02:42 AM

sakuljw

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Location: Seattle, Wa

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Year: 1992

Model: Cherokee

Engine: 4.0L HO

Try Lucas oil additive or similar product, eliminates minor blowby

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02-29-2012, 07:08 AM

MallCrawlXJ

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Location: Littleton, CO

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Year: 1991

Model: Cherokee

Engine: 2001 4.0L

Valves sticking and worn piston rings are about the only causes of blow-by. At my shop, if it has blow-by, it gets rebuilt or replaced.

Easiest way to figure out if you need a rebuild is to do a compression test.