Is this sentence ambiguous?

[mallu]

I would like to know if the following is ambiguous ( I dont know wheather its grammatical ) # All the cars weren't sold.  Many thanks in advance

[Daniel]

Note: cars should be plural.

Yes, it can mean either:
"Some cars were not sold."
"No cars were sold."

(I think the second reading is most basic, but the first seems more useful. Context would decide.)

[Forbes]

This is another sentence which comes across to me as not quite right though I would not discount it ever being uttered and meaning "Some cars were not sold". I feel a speaker is more likely to say "No cars were sold" or "Some cars were not sold/Not all cars were sold" according to what they meant.