puttra

puttra (present puttrar, preterite puttrade, supine puttrat, imperative puttra)

to make a sound like boiling water
(by extension) to simmer, to boil
en puttrande gryta
a simmering stew

Potatisarna puttrade på spisen
The potatoes were boiling on the stove
to putter (make short, dull, quickly repeating noises (of some engines))
Mopeden puttrade iväg
The moped puttered off

Like smattra in (sense 3), but dull and not too loud.

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Swedish