High pitch noise
 

Have a high pitch noise when the engine is running.

Doesn't seem effect performance but something isn't right.

Any ideas?

Re: High pitch noise
 

Can you localize where it's coming from? Font ? Rear?
Motor? wheels?

Well I had a "whistle" noise coming form the TB.
It ended up being some build up near the plates.
I took the bellows off and wiped them down and reapplied
grease (it facilitates full closure).
The whistle went away.

Re: High pitch noise
 

I'll check that Scott.
Noise is coming from the engine.

Re: High pitch noise
 

If it is not a high pitched whistle but more of a metal on metal squeal then you can take paper towel core (tube) or a 2ft section of hose and use it to your ear to aim at the water pump, alternator, idler pulley, etc to try and localize it.
Get a suspect then remove the belt and turn each by hand.

If the noise goes away once the engine is warmed up then suspect the water pump. Maybe it's time to flush and put in new fluid? Or add some water pump lube? If that makes it go away then it would be wise to keep close watch for fluid drips for a while.

Re: High pitch noise
 

Plenum to inj. housing vacuum leak ?

Re: High pitch noise
 

Frank,

I just had this happen. Turns out my fuel rail bolts were loose. Injectors and rails could move around. That should be the resolution of my "disappearing IAC counts" at idle. So I ran the 1/2mile and Dyno that way.

DUH!

Re: High pitch noise
 

Hi guys, I?m experiencing a constant squealing noise. Does not change much with engine RPM. When you shut the motor off it continues for a couple of seconds then sort of tapers down in frequency, like a bottle rocket sound.
Do I need to pull the whole Plenum off to get access to the injector housing that may be the culprit? Thanks

Re: High pitch noise
 

Yes.

Re: High pitch noise
 

Sounds like a vacuum leak


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