Mechanics

'04 TINNY VIBRATION UPON ACCELERATION

2004 Cadillac Escalade • 70,000 miles

My wife's 2004 V-8 4WD Escalade has a faint, tinny vibration that only briefly occurs upon initial acceleration from stop and disappears within 1 to 2 seconds. I've inspected the exhaust components and heat shield and nothing seems loose enough to be causing the noise. It never occurs at moderate to higher speed and does not sound deep enough to be an internal, mechanical issue. Any thoughts?
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Gwest12
May 6, 2012.




Hello
Well, let’s give it a try as it will hard to diagnose noise over the internet. This vibration, do you feel it in the steering wheel, on your bottom, does the vehicle seem to shake or is it more a noise?
There is a TSB discussing a noise under the hood at low speeds. I have attached a portion of it to see if this is what you may be talking about.
There is also a TSB that talks about a clunk, bump or squawk when vehicle comes to complete stop or accelerating from a complete stop. I have attached part of that.
Is the noise still there in 4WD
If you put the gear selector in 1st and accelerate, is the vibration still there…. Another words, accelerate slowly past the point that the vehicle would shift into the next gear. I attached another TSB about a noise from shifting.
Try turning the AC off. Then start off again and see what it does. There is another TSB stating an under hood rattle noise heard on acceleration. This TSB also states the serpentine belt tensioner and serpentine belt may also be damaged or the tensioner not providing enough tension. How does the belt look and I attached part of that TSB.
There is also a TSB on a rattle or squeak from the front upper shock insulator. Have the shocks or any components around the shock been replaced?
There is also a TSB on the tires causing this. How new are the tires? Has this ever done this until now?
Does this happen just in a straight line when taking off or in a turn or bumps? There is a TSB on this also.
I know you said only on initial acceleration……what about at idle with AC on? Is there anything – a vibration in the steering wheel or the noise at all at idle? Another TSB
Okay – please look over the partial TSBs I have sent and see if any of them sound like it so we can look more at them. Also try the others things I asked……taking off in just first or just second……. AC on and the AC off - look at the belt and tensioner. Look at the engine area and touch and feel things to see if loose. Lay under the engine and look around also doing the same to include the wheel wells, and suspension area.
Let me know what you see.


ImpalaSS
May 6, 2012.


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