High pitched noise under the hood

Z

Zeke23

NAXJA Forum User

Location

CT

• Dec 30, 2008

• #1

This just started over the weekend...it was very quiet then but its gotten much louder over the past few days.

It is some sort of whine/whistle that is coming from the area around the left side of the engine...

It only happens when idling...it goes away if I put on the least bit of gas.
It is more of a high pitched whine at idle but as soon as I put on gas it turns into a whistle for an instant and then goes away.

Any ideas?

 

X

xj88superjeep

NAXJA Forum User

Location

NJ

• Dec 30, 2008

• #2

Vacuum leak???

 

J

jeepster_259

NAXJA Forum User

Location

West Palm Beach, FL

• Dec 30, 2008

• #3

alternator bearing? when mine went bad it was a constant whining sound coming from that area. Take your belt off and check all of your pulleys to see if any are bad.

 

K

kujito

NAXJA Forum User

Location

colorado

• Dec 30, 2008

• #4

Your engine bay gnome has gotten himself stuck in something. The noises are his moaning then shrieking in pain just before going into shock and passing out. If you don't save him, he WILL eventually get himself free and really screw something up as revenge!

 

X

xj88superjeep

NAXJA Forum User

Location

NJ

• Dec 30, 2008

• #5

kujito said:

Your engine bay gnome has gotten himself stuck in something. The noises are his moaning then shrieking in pain just before going into shock and passing out. If you don't save him, he WILL eventually get himself free and really screw something up as revenge!

Click to expand...

Maybe if you are good to him he will eat some of the gremlins, but probably not... They usually live in harmony

 

ParadiseXJ

NAXJA Forum User

Location

Paradise, CA 95969

• Dec 30, 2008

• #6

Check the big rubber hose (air intake) at or around the throttle body and/or vac hoses in that area for a crack or gap. Check all the vac connections at the airbox and manifold.

Repair/replace as necessary

 

snail

NAXJA Forum User

Location

North Jersey

• Jan 1, 2009

• #7

thats what my alternator sounded like when it was going. the whistle was also audible though as the rpms dropped though when i used the trans to slow down (5spd) and not just at idle

 

F

FUNKYTEE5

NAXJA Forum User

Location

Vancouver, Wa.

• Jan 1, 2009

• #8

Check the idler pulley bearings. I had one that dried up on me and made a loud high pitch whine at idle. If you have a mechanic's stethoscope it'll help you pinpoint the noise.

 

L

lawsoncl

NAXJA Forum User

Location

North Idaho

• Jan 3, 2009

• #9

FUNKYTEE5 said:

Check the idler pulley bearings. I had one that dried up on me and made a loud high pitch whine at idle. If you have a mechanic's stethoscope it'll help you pinpoint the noise.

Click to expand...

I prefer a piece of garden hose. Hurts much less when you get it in the fan. :}