Does it have a timing belt or does it have a timing chain?
Personally I really don't know, it actually makes me no difference anyway, but to a prospective buyer it could make a world of difference, especially if they were uneducated in those matters.
They most all have the serpentine belts, that's simple enough.
They most all have timing chains too, and it's been well disclosed how much difficulty those can be, to the point of removing, and in some cases Replacing, the entire engine.
Soooo, a fella knows he's got a bad Timing chain and replaces the serpentine belt, then advertises it as "new timing belt", and a prospective buyer believes a major problem has been addressed, and proceeds to purchase the vehicle with a shiny new belt and an old timing chain.
However, when the seller is confronted with this he plays dumb and says he had no clue it hadn't been fixed.
Simple question, and no I didn't review the ad with a magnifying glass, although I'd almost guess the prospective buyer best.
Why I wondered what his specific explanation to "new timing belt" might be
2000 4 cylinder is a 2.5 lima, it has a timing belt not a chain. It's a basic maintenance item that gets changed at set service intervals on that engine, like spark plugs and wires. Usually done every 100k. It's somewhat annoying to change though (not as difficult as some, but still a few hours work) so buying a used truck and knowing the belt is new is a pretty good selling point.
The duratec 4 cylinder is in 2001.5 and up trucks. It has a timing chain which does not need to be changed for the life of the engine unless something fails. On that engine if the seller said it had a new chain, then I'd have concerning questions. Mainly since a chain failure on a duratec would cause catastrophic internal damage... a broken timing belt on a lima engine just means the truck wont run until you replace it.
The lima is a non interference engine (broken timing belt causes no damage) the duratec is an interference engine (broken chain causes valves to hit the pistons).