pcv possibly?
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fwiw, the engines on a 240/740/940 do not actually have a PCV valve, rather, they have an oil trap aka flame trap that vents into the intake air... these traps have to be cleaned periodically, as when they gum up, excess crankcase pressure can blow oil seals (typically, the camshaft seal).
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joshofalltrades
Volvo 240, 740 & 940
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06-09-2012 09:16 PM