I have a 98 ford explorer sport 4.0 L. EFI When it gets hot outside it makes a loud humbing/roaring sound from the breather and when you accelerate it stops, only does it at idle. What would be the problem??
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Bummer. What I do is in a vacant lot, drive the car and steer hard left, then right. The thinking is to load and unload the bearing on each side. Sometimes the noise travels and can mislead you. If the sound gets quieter on a right turn, it is the right side bearing that is suspect. Sometimes you need to put the car on a lift (ALL 4 wheels safely off the ground) and listen with a stethoscope....
3 suggestions for you, you may need to check the tire pressure, get a tire alligment done, or you have a bad wheel bearing, usally a bad wheel bearing make's a loud roaring sound going down the road. I hope I have helped you.
This sounding like an Idler bearing problem, Sounds like the idler bearing that supports your belt is either loose or needs replading. I say this because when you get the RPMs up on the motor the noise should almost disappear?
that is true your firing order is wrong here is a link to a web sight that has all the 1998 explorers 6cyl just click on the one that your explorer is and it'll show you the correct firing order also make sure you have your plugs gaped right good luck.