99 s10 airplane noise

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Old 10-04-16, 05:59 AM
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99 s10 airplane noise

Its the 4.3 v6

I have been trying to diagnose a vacuum leak code for a while now.
I barely drive it except for wharehouse runs on the weekend.
Lsat weekend I was driving to get some blocks and its not a far run, but getting off the exit (about 8 miles) my truck started making this airplane noise when I hit the brakes.
It stopped at full stop. I thought it was the brakes themselves but the pads still looks fine.
This Sunday that just passed it did it to me the same time going to the same place but now its constant.
Airplane noise when driving non stop. It only goes away when fully stopped.
I can not make it make the noise throttling when in park, nuetral or when holding the brake and reving (to a safe rev). Only when driving. It seems to get quieter the faster I get but it could just be getting drowned out more.

Im honestly in the market for a new"er" truck but was hoping to get this past Feb when my tax returns come in.

Ive done some online searching and get multiple results
the two that keep popping up are
fan clutch
vacuum switch.

thanks
 
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Old 10-04-16, 06:49 AM
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Noise

I did not see a question in your post.
 
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Old 10-04-16, 08:24 AM
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was wondering what the noise could be?
Where to start looking or how to troubleshoot.
thanks
 
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Old 10-04-16, 10:53 AM
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Any change in braking behavior (e.g. pedal pressure)? Have you checked the brake booster vacuum line? I would get a bottle of propane and start checking your vacuum lines.
 
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Old 10-04-16, 11:06 AM
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Noise front, rear, left, right, does it change with road speed?
 
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Old 10-04-16, 12:10 PM
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I honestly cant not tell where its coming from.
It seems to get quiter the faster I am but I am not sure if the speed is drowning it out.

I havent checked the brake booster vacuum. Not even sure what that honestly is. No apparent change in braking I can tell of.
 
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Old 10-05-16, 05:37 AM
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If that has a fan clutch, maybe locked up?
 
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Old 10-05-16, 05:39 AM
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With truck off fan should turn freely by hand.
 
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Old 10-05-16, 11:48 AM
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Ill try that when I get home tonight. Would love to have this thing go through the winter. Hitting a tight spot with money and not really looking to pick up another payment, nor another beater truck.
 
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Old 10-05-16, 01:32 PM
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I have the 96 s10.. Been through 3 airplane noises.

First one I had was the A/C Bearing. Mine sporadically made the airplane noised on and off. Was hard to find as it resonated throughout the engine. Turning the A/c on the noise went away somewhat until the bearing was completly toast. Then sound was constant. Installing new clutch fixed it but a/c leaked 1 year later and compressor went so was a waste of $$$.

Was going to just do this bypass pully..

A/C Compressor Bypass Pulley for Cars, Trucks & SUVs

2. Other airplane noise ended up being the fuel pump. But this sound should be more evident behind you . sound should change with speed.

3. Heres the one that was tricky and what I thinks yours may be. It took me 4 months to find this one as the sound was identical to the A/C bearing... What was it????

The PCV valve. It was squealing like a pig I tell you. At times it would go away and other times sounded like a jet taxi for take off.

Let us know what you find..
 
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Old 10-06-16, 06:25 AM
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Thanks guys, been busy this week so I Might have to wait till the weekend to check these. Maybe I can drive around and video the noise for a better idea of what it could be.
 
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Old 10-09-16, 09:33 AM
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So I did some TS and threw it in 4wd and the noise stopped. Instead I get a small dill click intermittently like the 4wd isn't fully locking in.

The click stops as I get faster but I'm sure the issue is still there

I did see reading a vacuum switch could cause this

Any other thoughts?

Thanks guys
 
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Old 10-09-16, 10:17 AM
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4 WHEEL DRIVE...

Do you have the buttons to shift to 4 wheel or the lever on the floor?

If buttons there is a motor in the T case. This has a plastic worm gear that gets stripped. That may be the clicking you hear. There is a vacuum switch on the T case too but this engages the front differential..

Under the battery tray there is a vacuum actuator. This pulls pushes a fork that locks in the front diff. These get corroded by battery acid and fail..

Could be vacuum issue, part issues etc...

But this is not the airplane noise is it? Something new?
 
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Old 10-09-16, 10:53 AM
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It's the buttons. I saw a video on the actuator recently. It is the airplane noise. As soon as the 4wd is clicked it stops.
I was reading about the t case. If it's anything to do with that I'm just going to drive it till it won't. I may try the vacuum switch and actuator fix.
 
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Old 10-11-16, 05:02 AM
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so funny story, leaving my driveway to go do a store pickup yesterday my truck made a loud CLUNK from the clocking tire and then the noise stopped. I mean this was LOUD lol.

I think the 4wd finally just fully engaged and maybe thats where it needs to stay. guess I wont be doing much highway driving for now and if so prob keeping it pretty slow.

Just had to dump 450$ on my car yesterday because both my rear drum brake cylinders went so I dont think I will be spending much money on this truck for a bit.
 
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