Zipping sound under acceleration? (1 Viewer)

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I don't think it's a belt issue but can't recall the exact issue. I bet a search will reveal some info.
 
It sounds like the consensus on the cold sound is that it's due to cold power steering fluid. The noise is coming from the power steering pump. I bought a new high pressure hose and pump rebuild kit. Maybe I'll get that done and see if it helps. Thanks for the ideas.
 
I get that whining power steering sound when it's cold as well. Time to replace the PS pump maybe??
 
Dunno, I couldn't really find any examples where someone actually replaced it and reported the problem fixed. Sounds like it's just a normal thing.
 
Well, finally got around to rebuilding my pump and installing the new hoses and I've been driving around for a week or so. I've had the sound happen twice since then, which is less frequently than before. Also, it seems like the volume is lower and the duration is shorter. It's also been warmer, so perhaps that's got something to do with it.

Based on this, I think the power steering system is still the most likely culprit. I've still got to rebuild the steering gear box since it's leaking too, so maybe that will help. I'm interested to see if the start up sound is affected, but it hasn't been cold enough recently.
 
Well congrats dude. Try playing around with different type of PS fluids, maybe that'll help with the zipping sound. I haven't heard mine this past winter but I don't exactly drive it every day either.
 
How about the fan clutch? It could be locking up under heavy acceleration then release when back off the throttle.

...via IH8MUD app
 
Fan clutch is a good thought. I've been wondering if I overfilled it because it seems to take a long time for the car to warm up (blue hub with 20k) and a newspaper won't stop it. However, the car has always made the sound pre and post fan clutch change. I think I would've noticed a change if it was the culprit.

I may experiment with different PS fluid after I rebuild the gear box.
 
DARKNESS said:
The sound is a zipping or like a low pitched prolonged honk. It sounds like rubber pressing against something that is rotating fast. No screech at all.

It only happens under hard acceleration, generally going uphill. It happens when accelerating from a stop or when accelerating while already going 20 or 30 mph or at highway speeds.

It does not happen every time I accelerate hard. I'd say maybe 10-20% of the time. I can't figure out a way to reliably reproduce it and I've tried pretty hard.

Once the sound starts, it lasts while I keep my on the gas. The sound persists if I accelerate. If I let my foot of the gas, even if it's just for a second and then I immediately reapply, the sound goes away. It's almost like two parts are slipping and if I give them time to catch up the slipping goes away. That makes me think it's something in the transmission, but I don't notice any power loss while it's happening. The transmission fluid looks fine but I haven't replaced it. I tested the viscous coupler and it also seems fine.

I thought I had it nailed when I noticed the muffler was rubbing on the driveshaft due to broken exhaust mounts. I replaced the mounts, but the problem is still there. It might be slightly better but it's hard to tell with how random it is. It was extremely difficult to rotate the exhaust back to where it should be to get the mounts on. Also the rubber mounts look like they're straining to hold the muffler off the driveshaft, so maybe that's still the issue? I don't have an OEM mount at the tailpipe since the PO cut off the resonator, so maybe it's not held in place properly. I definitely have a mean whistle at high RPM due to the lack of resonator, but this is a different sound than that.

I've had the sound since I bought the truck. Since then I've done a front and rear axle service including brakes. I've replaced the u-joints and had the driveshafts balanced. None of those things made any difference.

So there's my long winded explanation. Anyone else have symptoms like this or have ideas what it might be?
Click to expand...

You're driving a Prius! The zipping plasticy sound is the cars "Engine"
 
I had a ringing noise last week that I thought was somewhere in the driveline and was going to cost me some $$$ but it turned out that my exhaust strap bolt had come out and the exhaust was pretty much laying on the front drive shaft. All it cost me was a nut, bolt, and some dirt in my eyes. Good luck on tracing it down.

...via IH8MUD app
 
That could be. I've got a mean whistle as well. The PO removed my silencer. I'm going with a custom exhaust this summer when I put in the SC. We'll see if it helps. I'm hoping that at least fixes the whistle.
 
Finally got a recording of the sound! It does it at the beginning and end of the video. Definitely seems to be related to going uphill almost exclusively. I drove from Denver to Steamboat over Berthoud pass and the only time I heard it was going uphill. Did not hear it under load on flat road. I'm beginning to suspect it's transmission related and is tied to a specific gear. You can see that in the video I think. It makes the noise, then it shifts down, then it shifts up and makes the sound again. Somebody's got to know what this is!



I'm going to try changing the tranny fluid when I get home. It looks fine, though it's very slightly overfilled. I already tightened the kickdown cable as it was pretty loose. That had no effect.
 
Come on, somebody's heard this sound!
 
Could it be sucking air into the intake through a bad hose like the air tube from the filter to the intake, brake booster hose, PVC or a vac/hose?
 
It's possible, but I don't have any other problems. Also, I've replaced pretty much all those things.
 
So, I flushed my transmission fluid and the sound seems to have gone away. I tried to do drain and fills at first but eventually did a cooler line flush. During that process I overfilled a bit. It seemed to make the sound more when overfilled. Once I replaced all the fluid and got the level exactly right it hasn't made the noise since. Unfortunately, it also got really cold so I can't rule out some sort of temperature relationship.

Anyway, I'm wondering if maybe it was the transmission pump groaning because the the tranny was overfilled. Perhaps the fluid was getting aerated on uphills when accelerating due to the fluid sloshing and contacting moving parts? Not really sure if that's possible.
 
After a couple month hiatus the sound is back! Lame! It definitely is not happening as often and almost seems deeper now. Is there some way to put a microphone on specific vehicle parts while driving? I don't see how else I'm going to narrow this thing down.
 
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