Technical Please please help

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Technical Please please help

atsimeri

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Goodevening everyone. I own a fiat panda dynamic 1.2 2005 model with 78000 Km. Lately I hear (on smooth tarmac mostly) a periodic noise that starts to sound at very low speed (20 km / h), increasing with speed and comes from the wheels (not sure if comes from the front or from the back of the car). 3 things crossed my mind:
1. Wheel bearings
2. faulty brake discs
3. faulty tyres

I went to the dealership and explained the problem, we did test ride with the engineer and then he lifted the car to determine which wheel had a problem. He said all wheels were spinning normally, no problem with wheel bearings nor brake discs and found a tire that was slightly askew. This was the cause in his opinion.

I changed the tires back and forth to see any change to the source of noise. Nothing changed.

I went to an independent garage and told them what was the car’s problem. We did the test ride, the engineer heard the noise, we agreed that we could not determine if the front or back and then he lifted the car. He said it as not a bearing, but the noise would appear only if the bearing was at pressure as in car movement and he could not identify the noise source, so he advised me to wait the bearing to wear MORE SO THAT HE COULD IDENTIFY THE PROBLEM.

It seems to me that of course there is a solution to identify which wheel produces noise and make the replacement of the failed component.

WHAT SHOULD I DO?
 
Goodevening everyone. I own a fiat panda dynamic 1.2 2005 model with 78000 Km. Lately I hear (on smooth tarmac mostly) a periodic noise that starts to sound at very low speed (20 km / h), increasing with speed and comes from the wheels (not sure if comes from the front or from the back of the car). 3 things crossed my mind:
1. Wheel bearings
2. faulty brake discs
3. faulty tyres

I went to the dealership and explained the problem, we did test ride with the engineer and then he lifted the car to determine which wheel had a problem. He said all wheels were spinning normally, no problem with wheel bearings nor brake discs and found a tire that was slightly askew. This was the cause in his opinion.

I changed the tires back and forth to see any change to the source of noise. Nothing changed.

I went to an independent garage and told them what was the car’s problem. We did the test ride, the engineer heard the noise, we agreed that we could not determine if the front or back and then he lifted the car. He said it as not a bearing, but the noise would appear only if the bearing was at pressure as in car movement and he could not identify the noise source, so he advised me to wait the bearing to wear MORE SO THAT HE COULD IDENTIFY THE PROBLEM.

It seems to me that of course there is a solution to identify which wheel produces noise and make the replacement of the failed component.

WHAT SHOULD I DO?

I had something surprisingly similar to this, about 20yrs ago on a R5 (different car but essentially the same setup).

Five mechanics variously drove the car & spun the wheels on a lift - the first round voting was brake discs 1, gearbox bearings 1, worn differential 2 & worn driveshaft spiders 1.

I was minded to the worn diff theory so started stripping the car down. Once I'd got the brakes out & driveshafts off, on spinning the hubs by hand it was easy to hear the real culprit was a shot nearside front wheel bearing. We'd all previously discounted this because there wasn't any play in it & you couldn't hear the difference just spinning the wheels, either by hand or under power, with the brakes assembled. It was only when the hubs were perfectly free to turn that you could actually work out what was going on.

So on the basis of what you've posted so far, my best guess would be a failing front wheel bearing.

I hope I'm right, because it's a cheap and easy fix.
 
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Often a failing wheel bearing will make more noise when loaded.
If noise increases in right turns it's the left side and vis-versa.
 
My 4x4 makes a noise too at this sort of speed, travelling straight or turning, and most noticeable over smooth surfaces. I've described it (here, a while ago) as sounding like someone rolling a marble or metal ball around in a metal dish.

I have a feeling it actually comes from the brake pads of the front offside wheel, which appear to 'rattle' in the caliper (they are not Fiat pads). I can stop the sound by very lightly applying the brake (just enough to make the pads 'kiss' the discs) with my left foot while continuing to drive. Not sure about the other models, but (unlike all my previous cars) the 4x4 pads don't have an anti-rattle spring clip fitted over them to stop them rattling in the caliper, which seems to be the issue.
 
I visited another garage today. Nothing new. They couldn.t find the source of the noise. I shot some videos underneath the panda. the first 2 are from the driver's side. I saw some play in the wheel and the shaft from the drivers side but not from the passanger side. oh and some strange noise drom the differential only when the driver's wheel was on the air. see for yourself:

driver's wheel youtu.be/od-07MWL84U
driver's shaft youtu.be/rAYP1iia8_Y
passenger wheel youtu.be/Zae2DKrtB6U
passenger shaft youtu.be/5Lczn9aDxdw
 
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Could be something simple like the tyres.

When I had a particular make of tyre, think it was the rubbish ones that come with all new pandas, the noise was dreadful. I changed to either bridgestone or firestones and the noise was gone.

Those eco bog standard tyres are dreadfully noisey.
 
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