Smelly fumes inside car

[Bob Culver]

Fumes generally originate from exh leaks, oil on the exh, or blow by. Oil on exh leaves black marks. Blow by evident as fumes from filler tube and possibly puffs when idling, and may be obvious from crank handle compression. From the distant days when very worn bores were common with most makes, severe blow by often seemed to cut in at some reasonably high revs.