Hi All,


First post on the forum. Lots of good info and thanks to those who set this up.


I had a pyrometer sensor installed on the manifold passenger side before the turbo. Not sure if this was present before the install, but after the engine is warmed up, I'm getting a high pitched whine that appears to be loudest at the driver's side wheel well. We're talking ear ringing pitch similar to the feedback you used to get through speakers from bad spark plugs. Changes with RPM and seems loudest at about 2,200 RPM and when RPM's are dropping.


Anyone had this issue? The truck is an '04 and has less then 2,000 miles on it. I can hear dog whistles, too, and the whine is starting to give me a headache most of the time.


Would it be a turbo leak, exhaust leak or possibly a small fuel rail leak?


Thanks for any help you can offer.


Steve S. in Kent, WA

Steve,


welcome to the forum. i hope you find it informative. i hear a noise like you mention from my buddies truck when the pyro wasn't tightened all the way, and exhaust gas was escaping around it. it made a noise that followed the engine in RPM, although the change in the noise was "behind" the engine by about a half a second.

What brand of gauges are you using ???


Mac

Mackin, I was thinking the same thing.


Steve

I'm guessing Isspro?

I'm guessing Isspro?

Bingo !!!!!

So are we,just waiting confirmation ....

Mac http://www.dieselplace.com/forum/smileys/Embarrased.gif Edited by: Mackin

Thanks All,


The answer to the gauge question is "Isspro". Did I miss something here? I haven't installed the gauge yet, only the pyrometer itself, so I could do a return for a different one.


Steve S. Kent, WAEdited by: smshiver

i thought it was only the boost gauge that made the annoying whine?

They have said the whine/hum that is noticed after installing EGT temperature gauge and pyro , is coming from the signal amplifier box ..... It's the diode, resistor or something that is the problem .....

I have not heard of a definate fix yet ....


Mac

I thought they'd fix it..? - Mine doesn't whine and I waited a few weeks for it to get here because JK was waiting for the new ones to get to him..

Yeah, the new versions are out from what I read back in Sept. I got mine from JK shortly after that and there is no whine.

They did fix it. My truck is as quite now as before the install.


However, from day one (before I installed the gages), I did notice a high-pitched whine that seemed associated with increase engine speed. This was not turbo whine. It appears to be electronic in nature and seems to track with the accelerator pedal movement. I can be at speed, push down on the go pedal for more speedhttp://www.dieselplace.com/forum/smileys/Big Smile.gif, and I hear the electronic whine. It sounds to be coming from the dash behind and to the left of the speedo cluster.


I've learned to tune it out....


Later....

I also had the whine from my Isspro EGT box. I called Isspro a few weeks ago, talked to I believe Scott in Aftermarket and they sent me a new box, no questions asked!! I asked if they wanted the old one back and he said no, trash it or give it to someone you don't like!! Had it within 3 days UPS.


New box is quiet as can be!!


Bob

[QUOTE=JMPDMax]

...from day one (before I installed the gages), I did notice a high-pitched whine that seemed associated with increase engine speed. This was not turbo whine.*It appears to be electronic in nature and seems to track with the accelerator pedal movement.*I can be at speed, push down on the go pedal for more speedhttp://www.dieselplace.com/forum/smileys/Big Smile.gif, and I hear the electronic whine.*It sounds to be coming from the dash behind and to the left of the speedo cluster.


I've learned to tune it out....
[QUOTE]

I'd sure like to know where this whine is coming from. I hear it under light acceleration only. It's definitely affected by go pedal position, and the sound is hard to localize. I think it's coming from the left side of the truck and my passenger thinks it's coming from the right side. I don't hear it much in solo driving, but when I'm pulling the trailer the pedal spends a lot of time in the position where the whine is emitted, and I'm not able to tune it out. It drives me nuts! The truck is totally stock.

Remember.... the turbocharger has a high pitched whine that goes with engine rpms.

This whine is at a constant frequency, I'd guess in the vicinity of 20,000 hz. The only thing that varies is its loudness. It's the loudest under light acceleration, and inaudable at constant speed or heavier acceleration.

I had the truck in to the dealer on Friday and the tech couldn't hear the whine. Sounds like a TV with the volume down and DOES change with RPM. The tech talked to GM and and GM said there MAY be an issue with a whine related to the turbocharger. The dealer tech is going to talk to someone else at GM on Monday. The only part installed is the fitting for the pyro probe with a cap on it. The probe is NOT installed at this time and the whine is still there. The whine didn't show up until I had about about 1500 miles on the truck.


I'll let everyone know if they find anything out. The whine is irritating.Edited by: smshiver

Do you have the wife or girl friend in the truck, maby that is were the whine is coming from..http://www.dieselplace.com/forum/smileys/Big Smile.gif http://dieselplace.com/forum/smileys/Evil%20Smile.gifEdited by: Blue Max

Good one Max!!!

New information and update ....


The left rear door open sensor went bad http://www.dieselplace.com/forum/smileys/Cry.gif and took the truck to the dealer today and they could hear the whine. Again, extremely high pitched, but heard from up to 20 feet away. The service manager said that the whine was NOT normal and they gave me a loaner car while they try to determine the cause. Only there when fully warmed up, goes away after idling for 5 minutes or more. Loudest near the left front wheel well.


They think it may be in the exhaust, turbo or the injector pump. We'll see ....

smshiver,


You mentioned that you didn't have the probe installed and it has a cap on it. I would imagine that you had tightened the cap down. My question is did you remove the compression ring before you installed the cap? I am only guessing, but maybe if the ring wasn't removed, the cap might be tightening up against it and not totally sealed the way it should be. Just my 2 cents.


Jeff

My 2003 {12k} has this whine and it is totally stock with the exception of Amsoil dual remote oilfilter setup. A good friend who is a Chev. Tech with all the training they offer says he thinks its simply the heavy duty front pump in the Allison. He has ridden in truck with me several times and that is his opinion. I dunno, I just tune it out, will make visit under warranty if it gets louder/worse.

Thanks for the posts everyone. I agree with Old Man in that the transmission does whine, but the tranny has more of a gear or, as mentioned, a pump sound. More pronounced when cold. The sound I'm getting is well over 20,000 Hz and is more like ringing in your ears.


I'm thankful that two people at the dealer agreed that it's not normal. Also, the tech was able to duplicate it yesterday, but not as loud as when I first brought it in. For $44k plus, these types of things should not be occuring (the dealer agrees with me on that, too).

Dirty Old Man,


I would not wait till things get worse. If you take it to the dealership now it will be loaded into their system as a problem. Then if they do not fix it or if they are "unable to duplicate" as I sometimes get. It will still be in their system. This will help you if/when things really get bad with the district manager. I also have a 6.0 on a standard truck and I had a problem starting at 6500 miles when the motor started making a hissing sound. I brought it in and they could hear it but couldn't find the source. It is in the block somewhere but nobody can find where. After a few visits to the dealership, I asked the store manager if something could be done about this. He said he can't do anything but he gave me the phone number for our district manager. I called him up and he made an appointment with me. The following week he was here in Alaska and I met with him. The first thing he did was went to the computer to see what was done about it. He seen all the visits and he even drove the truck and he heard it as well. He knew it wasn't right and since all their technicians looked at it. He gave me a 125,000 mile full warrenty on motor and transmission. He wasn't going to give me the transmission but when he listened to it he said it sounded close to the front transmission area as well. So, he gave me that. The hissing sound isn't that bad, it isn't ear piercing and I can't hear it unless the radio is off and/or the window is open. Basically, get your vehicle in and at least have them go over it. If it is something not right and your local dealership can't help, you always have another option, only if you can show you have tried to get it fixed.


Jeff

UPDATE ... Got the truck back today and the dealer believes the noise is from the steering gear box and will be replacing it next week when the part comes in. Dealer indcated that tech support is aware of the problem.


Will let you know if that eliminates the noise.

I too have what I would describe as a high pitched whistle noise that changes with engine rpm.

AND NO its not the turbo. I have driven turbo cars before. This noise is like a noise you can make with your tounge while you whistle at the same time if that helps.

Sounds like the old volkswagon beetles with that tiny exhaust that whistled.

Its really a hard sound to describe.