A fuel leak.
A coolant leak, coolant has a sweet smell.
An exhaust leak.
A burnt clutch.
A burnt rubber smell, from a slipping accessory belt/tensioner or rubber contacting the exhaust.
A Moldy smell with the A/C on from a dirty/moldy evaporator.
An oil leak, if it is leaking near the exhaust manifold, from say the valve cover.
A smell from burnt brakes from a faulty brake caliper.
A burnt plastic smell, from plastic melting against the exhaust( wiring loom, or plastic bag on catalytic converter).
A. mildew smell caused by a water leak, clogged evap case drain, flogged sunroof drain.
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