Noise at freeway speed

sherwood · Sep 2, 2019

I've developed an occasional sound that sounds like a can rattling around at freeway speeds coming from front of truck. It comes and goes and I haven't been able to reproduce it on demand but was able to get a video/sound clip. You can see in the video the turbo isn't kicking in, speed is constant, but comes on randomly. Any ideas?

smurfslayer · Sep 2, 2019

someone slow that audio down and I’ll bet we hear some long lost ancient Sumerian curse or something.

That’s odd for sure. Not sure what to make of it.
What was the last service, maintenance or modification done to the truck?

GCATX · Sep 2, 2019

Loose skidplate?

sherwood · Sep 2, 2019

smurfslayer said:
someone slow that audio down and I’ll bet we hear some long lost ancient Sumerian curse or something.

That’s odd for sure. Not sure what to make of it.
What was the last service, maintenance or modification done to the truck?

Gets regular maintenance and service. Probably last dealership oil change/service was 8 months ago? Truck has Deaver rear and Geiser front springs.

sherwood · Sep 2, 2019

GCATX said:
Loose skidplate?

Haven't looked at that but love the idea!! Lets hope!!

Maxcap · Sep 3, 2019

I had a similar problem with my 2017, and it turned out to be a bad check valve tube assbly FL3Z*3A788*B that was replaced under warranty. Without the vacuum it is always unintentionally trying to slightly lock the wheel, producing the grinding sound. The dealer should also inspect the wheel bearing splines, to make sure there is no damage from the grinding to this point.

smurfslayer · Sep 3, 2019

Maxcap said:
I had a similar problem with my 2017, and it turned out to be a bad check valve tube assbly FL3Z*3A788*B that was replaced under warranty. Without the vacuum it is always unintentionally trying to slightly lock the wheel, producing the grinding sound. The dealer should also inspect the wheel bearing splines, to make sure there is no damage from the grinding to this point.

that never even occurred to me. If I remember correctly, a successful transfer to 4A should stop the noise. If it does, that’s the issue. I’m used to the IWE being referred to as a grinding sound.

Maxcap · Sep 3, 2019

It doesn't sound like low pitched grinding you'd be expecting... more higher pitched and shrill like a thin metallic can in bigger can rattling sound.

KirkT · Sep 3, 2019

This thread saves here! I brought it to local dealer for 3 times for this issue, they don't know what noise I am talking about, I am so frustrated. is this something I can check myself and show them directly as an evidence.

Maxcap · Sep 3, 2019

Google the part number, and you'll find a couple of good YouTube videos showing the part and easy replacement. The new part # ends in B not A. The new part is easily identified with a blue not black jacket. It is supposed to be a common problem, and worth the 5$ to replace even if not leaking vacuum yet .

Noise at freeway speed

sherwood

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smurfslayer

Be vewwy, vewwy quiet. We’re hunting sasquatch77

GCATX

King Dingaling

sherwood

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sherwood

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Maxcap

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smurfslayer

Be vewwy, vewwy quiet. We’re hunting sasquatch77

Maxcap

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KirkT

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Maxcap

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