Whine Noise that makes me crazy - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
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post #1 of 21 (permalink) Old 12-19-2013, 11:14 AM Thread Starter
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Angry Whine Noise that makes me crazy

Hey Guys

I have a 1999 Firebird V6. We did a lot to the car already, but since Day 1 I have this whine noise and it makes me crazy. We try to find the source of the noise.

What we did:

- All idle pulleys
- New water pump.
- Clutch throwout bearing

It was stuff that needed to be done anyway. Oil is changed as well. I am very picky with my car. So on a test-drive the whine noise came back. After all what I spend, it is kinda...well let's say it cost you the last nerv (I am german, sorry for the english). When you remove the cap from the Oil Tank, air comes out.

I did some research in the web and found a guy who had the same 3.8 problem like I had, and he said it was the PCV Valve. I am new on this field, and I have an half idea what he talks about. Is that the thing that is located under the passenger side intake? I have a V6 and not a V8. Before I owned a 1988 Formula, that was a complete different field of work.

Guys I face it> I have no idea what to do. I just so hope somebody can help me. May by somebody had the same problem, what do you guys think.

Thanks for reading:

Lars
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post #2 of 21 (permalink) Old 12-19-2013, 11:43 AM
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please complete the following quiz to help narrow it down

- any change between hot engine and cold engine?
- does it change in pitch or volume with RPM, or both?
- does it sound different when the engine is under load?
- does it change when steering from a dead stop?
- does it change pitch when you put electrical load on (headlights or something)?
- when the car is going faster, does it get louder or change pitch? (is it based on engine speed or car speed)
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post #3 of 21 (permalink) Old 12-19-2013, 12:09 PM Thread Starter
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Hey

No problem, sorry again, still learning>

- any change between hot engine and cold engine?
> Happens when the car is warm
- does it change in pitch or volume with RPM, or both?
> With RPM (gasing) it goes louder, when engine runs its steady
- does it sound different when the engine is under load?
> No
- does it change when steering from a dead stop?
> No
- does it change pitch when you put electrical load on (headlights or something)?
> No
- when the car is going faster, does it get louder or change pitch? (is it based on engine speed or car speed)
> It is gettin louder when I gas it but when the car runs normal its a steady

Hope that helps so far
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post #4 of 21 (permalink) Old 12-19-2013, 02:00 PM
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ok so it's only when the car is warm,

it gets louder when the engine rpm increases,

but it doesn't change pitch (tonhohe in german i think)?

just making sure, because that's very important, since usually things on your belt/tensioner/alternator/power steering/etc. will increase in PITCH as engine speed increases, and usually they are much worse when cold.

is it more a whistle or a whine?

can you take a video and post it?
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post #5 of 21 (permalink) Old 12-19-2013, 04:05 PM Thread Starter
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Hey

Quote:
belt/tensioner/alternator/power steering
Belt is not the problem, tensioner neither, alternator either. We took the belt of and on the lift was still makin the noise. Power Steering not realy either, it does not change the sound when I turn my Steeringwheel. It just realy do it when Gas the car a little. Whining no, its more like a whistle... It realy sounds like a Whine Or Belt Squeal. The guy for GM where going to tell me I need new gaskets, but they supergood in their...
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post #6 of 21 (permalink) Old 12-19-2013, 04:21 PM
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it could be a vacuum leak; a tiny vacuum leak will whistle/whine

i'd really like to hear it, take a cellphone video or something?
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post #7 of 21 (permalink) Old 12-19-2013, 04:28 PM Thread Starter
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Video is uploading

Last edited by LarsG; 12-19-2013 at 05:00 PM.
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post #8 of 21 (permalink) Old 12-19-2013, 05:19 PM Thread Starter
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post #9 of 21 (permalink) Old 01-08-2014, 01:39 PM Thread Starter
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Update....looks like it has to do with the Intakes and air...probly dirt in a pipe...in Spring I get into that...gonna be a bitch
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post #10 of 21 (permalink) Old 01-09-2014, 04:14 PM Thread Starter
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Update on my car:

Yesterday my buddy and I replaced the PCV Velve and thought that could be finaly the end for this story but it was not. So, back to investigation. The next thing what we going to do is

1. Check the air filter and the air filter housing (might be clogged
or even a cloth or rag has gone inside)

2. Check the breather pipe (it's the pipe that takes oil vapor from
oil pan to air filter or intake manifold)

Since my engine runs like a dream I do not think I have
a major engine problem. I also have no leaks. It sounds
mainly like filter and breather. As these cost nothing and are easy to
check before concluding it's an internal problem (piston rings...) we will go to this problem next...my goodness, this car is giving me a heck of a time hey. Anyway I hope after that this is the end of the Story and I can go back to the other stuff I was gettin me. What do you guys think ?

Lars


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post #11 of 21 (permalink) Old 01-31-2014, 01:07 PM
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Sounds like a vacuum leak. Look for any broken hoses or ones that aren't connected

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post #12 of 21 (permalink) Old 01-31-2014, 02:55 PM Thread Starter
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Quote:
Sounds like a vacuum leak. Look for any broken hoses or ones that aren't connected
Hey

Thanks, I will investigate this tonight, I will do some enginework during the weekend...I let you guys know when somethinge new pops up...my car gets a big update in the next months Thanks to
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post #13 of 21 (permalink) Old 02-07-2014, 09:04 AM Thread Starter
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I work on the car since last Week Friday, I will do some testing, but have problems to get to the engine, anyone have an idea what helps ?
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post #14 of 21 (permalink) Old 02-13-2014, 08:04 AM
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Sorry your video was removed so I wasn't able to listen to the noise. I would look into the intake tract for any air seeping in at loose clamps or connections. Try removing the air filter and take it for a ride and see if the noise becomes lower in volume. Do you still have the original air intake on the car?
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post #15 of 21 (permalink) Old 02-13-2014, 08:38 AM
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If it is a vacuum leak, spray small sections of the rubber tubing with a silicone spray (tire shine seems to work well) and listen for the noise to change, After each section wipe them down with a cloth and move on to a new section, I have found this to be the easiest way to locate both leaking and dry rotting hoses.



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