I hear a high frequent noise under my hood,don't know where it comes from, tried to find out with a screwdriver- negativ.
anybody has an idea?
Horst

[This message has been edited by Horst (edited September 26, 2001).]

 

What exactly does the noise sound like is it a squeal like a loose belt or more like a whine?

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it' a high whistle

 

sounds like a vaccum leak.. try to find the general area it is coming from by either getting a automotive stethoscope or use a peice of old heater hose about 2 feet in length, put one end up to your ear and move the other end around trying to find it.. there are other ways to find, but ill explain later, since were not even 100% sure thats the problem...

do you have a home made k&n air filter setup? when do you hear this noise? at idle, while driving, at high rpms, etc..

 

the noise is always there, when the engine runs, and the filter is orig. GM
thanks so far to you guys and great to be back to thirdgen.

 

you can also take wrench extensions combine them put to all the accesories and it works the same as a stethoscope but u already have the parts

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K&N,MSD Gm Coil,TB Bypass, Flowmasters with Hand Made Tips, Msd Heli-Core Wires, Cold Air Intake, Dynomax High-flow cat,Rapidfires, AND IN ONE MONTH VORTECH BLOWN CUSTOM INSTALL W/ A COMPUCAM! I feel the need to race after that...ill let you guys know after its done, and ill be sure to dyno!
Next:
Cam, Rockers, Pulleys, Msd 6a...maybe a 3.4 crank too..boost torque a bit...

 

New facts,
when the coolant becomes hot, the noise is louder, short before the thermostat opens, sounds like over pressure. Couldn't locate yet where it comes from.
any new ideas?

 

New facts,
when the coolant becomes hot, the noise is louder, short before the thermostat opens, sounds like over pressure. Couldn't locate yet where it comes from.
any new ideas?

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www.marion-becker-nidda.de

 

check your water pump.. does the car over heat at all? any coolant leakage? hopefully you got an electric fan so this is easier, if so, take the belt off the pump, and firmly grasp the water pump pulley, try to wiggle it around and pull it in and out.. there should be no play...

 

it's a coolantleakage, I guess headgasket.
oil looks like chocolatemilk.

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www.marion-becker-nidda.de