Thread: supercharger whine

Do you have a boost gauge?

My guess is that you have an issue with your BBV not closing, err... opening, I forget which way is which with those things.

Does the DIC bars fill up? You can test the valve by holding the BBV lever all the way down while someone gives it throttle and watches the boost on the DIC. If it fills up when you hold it down but doesn't fill up when you're not touching it, replace the BBV. Here is the BBV lever you need to hold down.

Originally Posted by KeithGTP03

Does the DIC bars fill up? You can test the valve by holding the BBV lever all the way down while someone gives it throttle and watches the boost on the DIC. If it fills up when you hold it down but doesn't fill up when you're not touching it, replace the BBV. Here is the BBV lever you need to hold down.

[IMG]http://i1214.photobucket.com/albums/cc486/keithr2213/runner.jpg[/IMG

Those "bars" are pretty much all throttle position. If you swapped in an N/A engine and went WOT they'd still all light up.

Originally Posted by SeanGTP

Those "bars" are pretty much all throttle position. If you swapped in an N/A engine and went WOT they'd still all light up.

That's incorrect. If that were the case, people would never run across the "half boost" problem. It's usually the BBV, solenoid or a vac leak.

Okay I know this is going to sound stupid but did you put the belt back on? Or the correct belt? A 3.4 pulley and the stock pulley use different sized belts.

Originally Posted by Mike Tackett

hey gtp whine, dude are you certain you power steering isn't a little low. mine whined when i first got it then i put the proper level of fluid in it

What? The? What did I just read? If the Power Steering was low, the pump would whine, but that would be all the time or while turning. It would have nothing to do with the boost. Did you even read his comments about this?

OP check for a vacuum leak. Take some B12 Chemtool, or Starting Fluid spray, or something similar and spray it around the connection points on the vacuum lines. Do this while the engine is running, but go point to point slowly. If when you spray a connection point the RPMS go up (engine surges up like someone gave it gas from the spray fumes in the lines) you have a leak there.

If you can't find any leaks, the BBV is working correctly, you don't have a CEL on, a new clean air filter is installed, I have no idea where to go next. This is a puzzler.

BTW If you didn't figure it out already.


Spots circled in red are silencer ports. They allow air to flow thru them to keep the whine down for the Regular Joe's driving the cars daily. If they get plugged off, filled in, etc... it gets much louder, but you would have to carve out alot more to get quieter, and that would probably reduce flow and boost as well. Unlikely unless the previous owner was a wack-job. People usually want to fill them so you can get as much noise from it as possible.

Good luck.