Sounds like a steam engine

[axelhdz2k3]

My 1997 Explorer 4.0 sohc sounds like a steam engine only when it's idling and in gear. This sound seems to come and go for the past year and now it's been making that annoying sound for a month. Can someone help?

Thanks

 

[carlover]

Do a search on IAC valve, im betting thats your culprit.

 

[Hokie]

Yeah, my truck does this too when I fire it up in the mornings

 

[Turdle]

like chugga chugga
or
wooo ?

http://homepage.mac.com/dogfriend/Explorer/iMovieTheater14.html