stanglx2002

I think i know what my problem is bc when my car is running i can hear a high pitch sound. It sounds like i have a vaccum leak somewhere. My question is how do i find the leak?

primetime5.0

others say to spray the vacuum lines with carb cleaner to see if there leaking

88GT40

what you would hear from a vacuum leak would be a hissing noise like air through a tube, you can use a short tube, vacuum line or something similar and hold it up to your ear as you probe along the vacuum lines while the engine is running, thats the hard way, or you can spray carb cleaner on all the hose ends and the areas between the upper to lower intake and listen for the idle to rise.

dc_mann8

still have smog? check its lines, one of mine has a hole in it and sounds like that

stanglx2002

i dont think i have a vaccum leak bc i hear a high pitch noise when its cold but when it warms up it goes away and idle fine. i know one of my problems is the TPS bc the setting is at 4.92 volts and it wont come down and i have tried everything i can think of.

babygurl2000

ahh the dreaded high pitched whistling noise..ive been trying to figure this out too remember?

88GT40

replace the tps it's cheap like 30 bucks, but i cant figure on how it would be making any noise occur

roundman

a high pitched whine could be the bearings in the alternator beginning to fail. remove the drive belt and run the engine a bit to see if the noise goes away. if it does, then it's a bearing on something being driven by the drive belt. if not, then it could be a vacuum leak or pressure leak from the smog pump.

stanglx2002

im going to check for leaks tom and do a KERO test too