Ford truck idles high

ford
f150

#1

I have a '95 F-150. The intial idle seems really high before it drops down and idles normal. A friend told me he thinks all ford trucks do that, because his Dad’s did that too.

It only does it when the engine is cold.

Why would it do that? It just seems like a waste of gas to me. Is it best to let it come down on it’s own? Sometimes I bring it down myself with a tap on the gas.


#2

How high?

All engines idle high when cold. They have to to keep running. The fuel mix is cold going into a cold cylinder, and in order to get some heat going for good explosions they need to run a stronger (richer) mix.