Supercharger-like sound from Hell!!!
hmm.....try turning the engine over by hand with a ratchet and socket on the crank pulley and see if you can hear the noise. You might be able to determine better where it is coming from if you can hear it then.
On The Tree
Joined: Jan 2012
Posts: 182
Likes: 0
From: Boston
Great idea! I hadn't thought of that. I'll be trying this soon
Launching!
Joined: Jun 2012
Posts: 251
Likes: 4
Keep us posted. My car is having the exact same issue. Let me guess, the noise changes with RPMs, sounds something in between a whistle and a squeak, but the car still runs perfectly fine?
Last edited by big_g; Nov 6, 2012 at 02:37 PM.
On The Tree
Joined: Jan 2012
Posts: 182
Likes: 0
From: Boston
Yes sir I've tried the following with no changes..(Still making the sound)
removed oil cap and ran
Ensured all pcv lines are connected to proper location and no leaking
checked for vacuum leak (none)
Triple checked intake manifold torque specs (89in lbs)
Ran it with the air lid disconnected (just MAF connected to throttle body)
Changed oil 2x (no metal shavings or anything strange came out)
Removed throttle body and cleaned
Cleaned the IAC and made sure O-ring wasnt damaged
Rev'd the engine with the clutch in and out
I'm running the factory Throttle Body
Someone mentioned it could be the factory hole in the OE throttle body blade... I doubt it, but just incase: Anybody getting this noise with an aftermarket throttle body with a solid blade/butterfly?
I'm running out of ideas, silly because it runs great
Launching!
Joined: Jun 2012
Posts: 251
Likes: 4
I recenty developed a "squeeking" noise along with the whistle. Thinking it's my alternator. I found a thread on that and the guy said his alternator was making a "supercharger-like whine" for a little while before it totally crapped out on him. I forget all you've checked, but just tossing it out. Let you know if replacing my alternator (assuming that's it) fixes both the squeek and the whistle.
I used to get that noise off and on, a whistle that varied with rpm. Got new AIR check valves, didn't fix it. But since I changed to an ls6 valley cover + PCV setup about a year and a half ago, the whistle has not come back. So maybe it was PCV related? I had also replaced that rubber piece that the PCV valve fits into with a piece of heater hose for a better fit.
Launching!
Joined: Jun 2012
Posts: 251
Likes: 4
I recenty developed a "squeeking" noise along with the whistle. Thinking it's my alternator. I found a thread on that and the guy said his alternator was making a "supercharger-like whine" for a little while before it totally crapped out on him. I forget all you've checked, but just tossing it out. Let you know if replacing my alternator (assuming that's it) fixes both the squeek and the whistle.
TECH Veteran
Joined: Aug 2002
Posts: 4,055
Likes: 1
From: Hartsdale, NY
If it is an auto tranny, the front pump could be making a whinning noise - especially if they rebuilt it. In the old days, they used to use paper tranny filters that would often clog and the front pumps would whine like a witch becasue they could not get enough ATF...
What is the condition of your ATF - color and smell please? It should be cherry red in color and should not smell burnt. Any ATF contamination in your antifreeze/radiator?
What is the condition of your ATF - color and smell please? It should be cherry red in color and should not smell burnt. Any ATF contamination in your antifreeze/radiator?
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