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Dan,
Have you tried running the car when warm in the garage (with the garage door open) and the hood open to see if you can smell the same fumes coming out of the engine compartment? I do not have the PCV hooked up on mine, but my breathers go to a catch can with vent holes. Does the smell appear to come more from the engine compartment, or is it from the exhaust possibly? Is there anything that could have come loose and is touching the exhaust or engine and is melting?
Seems like you have had this car for a long time and this is the first time that I have seen you mention it. It sounds like something new, as opposed to something chronic. Being that winter has just subsided somewhat, is it possible that there is a mouse nest that is warming up?
Jim
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