if its an RPM dependent whistle its probably a vacuum leak. check your IAC valve for proper adjustment, check all the vacuum lines to see if one is disconnected or cracked. The only other "whistle" I know of is the transmission at speeds due to restricted flow but thats usually due to a clogged filter and you changed that.
are you sure its a whistle? and not maybe a bearing whine? the idler pulleys make an interesting whine noise almost like a supercharger when they go bad.
It could definitely be a whine instead of a whistle. I'm going to try and see if I can isolate what is making the sound and report back.
I am having the same problem. It's been around for a long time (months) and I have just been way too busy to spend time going after it. I think mine is making noise from the pulley on my alternator. It used to squeak alot and was worse on rainy, damp days and now it just whines like it's supershraged. Does it in park and it's rpm dependent. Anyone else had this happen and had it be the alternator?
Check the idler pulley, its the one that seems like it does nothing but spin. Also disconnect the belt and remove it, then start it and see if the noise is gone. that will let you know if its related to a pulley or a vacuum leak.
[SIZE="1"][B]95 ZJ 5.2[/B]- D30/XJ shafts/D35 Yukon alloys,249, 2"BB, 30x9.5"Wildcat EXT,lots of motor mods, rancho shocks & stabilizer.[/SIZE]
[QUOTE=slayercr23;12630497]How would i go about Stroking it?[/QUOTE]
If it is a bearing do what Phit said with the stethiscope pipe, unless you have a real one.
That way you are not swapping out pulleys you don't need to.
[COLOR="Red"]Any Jeepers in Edmonton, AB
I am on channel 33.[/COLOR]
I live, I ride, I am JEEP.
So I bought a short PVC pipe to see if I could isolate where the noise is coming from and now I can't reliably reproduce it. I can still hear it, but it is intermittent. I have to keep playing with it to see if I can figure out what is wrong.
The noize you are hearing is the sound of the hidden turbo spooling up on selected models of 95' ZJs.
vehicle:car: engine: supercharger
(+1, -3) [vote for,
Maybe this sounds crazy -- but as any engine runs theres exhaust. And that flow of spent gasses already moves pretty quick. So in elimination of a need of a complex turbo, why cant we run the gas flow from the exhaust valves directly to the intake runners? This would improve efficiency of the engine while only adding minimal cost. Let me know if I am crazy but I think this would work as long as we could somehow add a Mass Air flow sensor so that the ecu knows how much fuel to dump in.
— Cardude, Jun 04 2008
I wish I could give you all an update, but as I said in an earlier post, I can't get the engine to whistle reliably. Since I can't reproduce the whistle when I want, I can't go searching for what is making the sound.
On the other hand, if it doesn't whistle anymore, that solves the problem right?