jons87mj Posted February 3, 2011 Posted February 3, 2011 i have a 1987 4.0 mj the other day i seen oil on the ground so the other day when i changed oil i seen my air filter why is what i would like to now thanks
ridergoatee Posted February 3, 2011 Posted February 3, 2011 You say oil in air filter? Possible ccv system problem. Make sure all is clean.
maddzz1 Posted February 3, 2011 Posted February 3, 2011 That is blow-by, very common in our trucks. Some people splice a catch bottle into the line between the valve cover and the air filter. Others solve it by upgrading to the 96+ (I think its 96+) valve cover; it has a better baffle in it and stops the oil from getting into the ccv line. Mjeff has a write up on it. If you do the VC upgrade you need to use the newer VC gasket too.
ratrapp Posted February 3, 2011 Posted February 3, 2011 i did the valve cover upgrade and it cut my blowby down by over 50%,maybe more.plus now more crappy valve cover leaking.it's an upgrade well worth doing.
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