howl from engine bay?

[TNTStang]

My 2000 Explorer Sport with the 4.0 OHV makes a howl when it is in idle or when I put it into reverse or drive. The odd time it happenswhen in neutral. It also occurs when I am driving when the RPM's hit around 3000. The sound has been happening more frequently but is for the most part intermittant. Sometimes if I give it a quick rev it seems to stop, other times it continuies. It's really embarrassing :fire:

 

[Blee1099]

My 2000 Explorer Sport with the 4.0 OHV makes a howl when it is in idle or when I put it into reverse or drive. The odd time it happenswhen in neutral. It also occurs when I am driving when the RPM's hit around 3000. The sound has been happening more frequently but is for the most part intermittant. Sometimes if I give it a quick rev it seems to stop, other times it continuies. It's really embarrassing :fire:

Try cleaning your IAC.. http://www.explorerforum.com/forums/showthread.php?t=84220 If that doesn't work, replace it.

 

[ox111]

sounds like maybe your power steering pump is going

 

[jimbo74]

i doubt its the power steering... ford has loud power steering pumps, but they are lousd all the time....

i am leaning more towards the iac, its a very common problem, but sounds more like a chirping other than a howl....

a howl can also be caused by otehr things, such as a modified intake or a vacuum leak....

 

[TNTStang]

I do have a swiss cheese airbox, would that be the culprit? I also have cat back exhaust. Is is bad to wait until spring to fix the problem? I would rather wait till it's not so cold out.

 

[jimbo74]

with modified intake and exhuast its highly possible nothing is wrong with your truck....

 

[TNTStang]

SO nothing will break if I don't fix it?

 

[jnealg]

no but it may get hard to start and may not idle at a stop light.
Mine has been howling for 6 months right now. I plan on replacing it soon, cleaning helped but it didnt go away completely. they run about $80 in parts stores round here.

 

[Heavymentill]

I had this problem and accidently fixed it when I reset my idle. Check this site out.
http://www.4.0performance.com/idle.html

 

[thewishkah]

I also have a howling but only when the truck is cold or just been started after sitting over night. It sounds like a jet engine almost(not as loud of course) and it increases with acceleration then goes away(its a 94) It might be normal for my truck cause its done it for as long as I can remember so I never thought anything of it till I saw this thread. by the way what is the IAC?

 

[Heavymentill]

This is a pic of a SOHC but it looks identical to an OHV. And Nevermind the arrow its the cylinder shaped thing on the right.

 

[Arnie897]

New IAC's are about 40 buck at Autozone if you don't feel like cleaning it.

 

[mpierich]

My 2000 Explorer Sport with the 4.0 OHV makes a howl when it is in idle or when I put it into reverse or drive. The odd time it happenswhen in neutral. It also occurs when I am driving when the RPM's hit around 3000. The sound has been happening more frequently but is for the most part intermittant. Sometimes if I give it a quick rev it seems to stop, other times it continuies. It's really embarrassing :fire:

Make sure the cooling fan turns free when the motor is off. The centrifugal clutch froze up in my '91 and it made a hell of a jet-engine sound.