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  #1  
Old 06-28-2012, 03:02 AM
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Vibration on Acceleration

Yet another tale of woe....well possibly. I get vibration/shudder when accelerating from around 93kmh upwards until just shy of 100kmh. There are no issues from standing start, or acclerating at any other speed above or below 93kmh. Its more noticable when under slight load (minor climb) but in all cases very noticable through the floor, the accelerator and steering column. Its nothing to do with tyres/balancing. I can accelerate hard from 80 thru to 100 no issue, its just planting my foot at or around 93kmh. Feels like an expensive fix? Any thoughts.
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  #2  
Old 06-28-2012, 03:56 AM
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Re: Vibration on Acceleration

Being it is under warranty, I doubt it will cost you anything.
The problem will be getting it diagnosed, due to the speed and that most Jeep mechanics have NFI.
I would think it may be more like the transmission locking and unlocking the clutch on the torque converter. You do not notice this under moderate to hard throttle, but will on light loads. Unless it feels like a serious problem, I would just monitor it as the grief having to get a dealer to look at it. If it gets worse then do something about it.
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Old 07-02-2012, 05:36 PM
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Re: Vibration on Acceleration

Every "now and then" I get a decent vibration through the cabin when stationary at a set of lights or similar which is most likely the air conditioner compressor kicking in.

Just a shot in the dark, see if it still vibrates with the air conditioner completely off.
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Old 07-02-2012, 05:46 PM
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Re: Vibration on Acceleration

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Originally Posted by AussieWK2 View Post
Every "now and then" I get a decent vibration through the cabin when stationary at a set of lights or similar which is most likely the air conditioner compressor kicking in.

Just a shot in the dark, see if it still vibrates with the air conditioner completely off.
I have both, vibration pressing the accelerator at 92/94kmh (all good at other speeds) and the same occasional one when stationary. The one when stopped sounds like furniture being dragged across a hard floor and vibrates through the steering.
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Old 07-02-2012, 10:11 PM
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Re: Vibration on Acceleration

There have been a few threads about a vibration at idle, which is caused by an aircon pipe vibrating against the firewall. Placing a pad between seems to fix it.
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  #6  
Old 07-03-2012, 12:10 AM
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Re: Vibration on Acceleration

Found the Noise!! The serpentine belt goes around this motor (guess it's the air con compressor). The outer pully rotates 100% of the time driven by the serpentine but the inner wheel/shaft (arrowed) is stationary. Every minute of so, the inner shaft (arrowed) engages (by a clutch?) and rotates for a moment then stops. I assume again that this must be the actual drive for the compressor providing chilled air to the climate control as required. Well, each time it kicks in.....I get the noise/vibraton..only for a split second....after a second the vibration stops even though the inner wheel/shaft continues to rotate....suggests it is a pressure issue as the sound is like trapped air in a high pressue water pipe but could possbly be an intermittent slip of the inner shaft as it engages and the sound resonating through the car is the chatter it would make if it wants to turn but is momentarily slipping?
I'm happy to have located it and that it's not related to QL or PS. Hoping its an easy fix. If its normal that the aircon vibrates under compression (and I mean VIBRATE - Very noticable and loud in the cabin and you can feel it though the steering wheel for a second as it kicks in) then it must be touching the firewall as AllyPally mentions. I'll keep you posted as it is in for it's 1 month freebie first thing tomorrow.
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  #7  
Old 07-03-2012, 01:01 AM
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Re: Vibration on Acceleration

That's good going! Just hope whilst they fix that problem they don't create another!
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Old 07-03-2012, 09:12 PM
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Re: Vibration on Acceleration

Quote:
Originally Posted by GlennR View Post
Found the Noise!! The serpentine belt goes around this motor (guess it's the air con compressor). The outer pully rotates 100% of the time driven by the serpentine but the inner wheel/shaft (arrowed) is stationary. Every minute of so, the inner shaft (arrowed) engages (by a clutch?) and rotates for a moment then stops. I assume again that this must be the actual drive for the compressor providing chilled air to the climate control as required. Well, each time it kicks in.....I get the noise/vibraton..only for a split second....after a second the vibration stops even though the inner wheel/shaft continues to rotate....suggests it is a pressure issue as the sound is like trapped air in a high pressue water pipe but could possbly be an intermittent slip of the inner shaft as it engages and the sound resonating through the car is the chatter it would make if it wants to turn but is momentarily slipping?
I'm happy to have located it and that it's not related to QL or PS. Hoping its an easy fix. If its normal that the aircon vibrates under compression (and I mean VIBRATE - Very noticable and loud in the cabin and you can feel it though the steering wheel for a second as it kicks in) then it must be touching the firewall as AllyPally mentions. I'll keep you posted as it is in for it's 1 month freebie first thing tomorrow.
Car was in for its free initial monthly check up and all is good with the car and its systems. (Although the replacement trim parts are "stuck in Melbourne" and could not be fitted).
The compressor made the noise right on que, pressure belch every time the compressor started with significant vibration through the cabin. (Got the noise on my iphone that I will post later taday). The service manager recalls this happening to another customer and advised it is a combination of the having the exact quantity of refridgerant, not too much, not too little, combined with possible touching pipes within the cabin amplifying the noise ....exactly as described on a Tourag forum. Sounds like we are on the right track. He needs the car for a day which I will arrange when my replacement trim parts come in. Keep you posted.
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Old 07-03-2012, 10:02 PM
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Re: Vibration on Acceleration

I guess the only problem I see with that service is that the mechanic (lets call him that, as I give him the benefit of doubt that he had some grain of formal training) diagnosed the problem, yet did nothing about it, except to waste another chunk of your time by having you to again return the car to them a second time.
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Old 07-03-2012, 10:08 PM
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Re: Vibration on Acceleration

Quote:
Originally Posted by allypally View Post
I guess the only problem I see with that service is that the mechanic (lets call him that, as I give him the benefit of doubt that he had some grain of formal training) diagnosed the problem, yet did nothing about it, except to waste another chunk of your time by having you to again return the car to them a second time.
Can't argue with that!! I'm going to roll the compressor fix with my trim panel replacement when they eventually arrive (Been waiting five weeks so far for the A pillar panel to arrive, so based on current dealer deliveries should be around October when I get the call to come in.)
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Old 07-03-2012, 10:54 PM
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Re: Vibration on Acceleration

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Originally Posted by GlennR View Post
Can't argue with that!! I'm going to roll the compressor fix with my trim panel replacement when they eventually arrive (Been waiting five weeks so far for the A pillar panel to arrive, so based on current dealer deliveries should be around October when I get the call to come in.)

Which year!!??
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Old 07-04-2012, 01:15 AM
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Re: Vibration on Acceleration

Here's the noise. Might prove useful as a diagnostic for people in the future.....I mean how the F%^& do you put this sound into words? Pissed up trombone player??? I don't know. This noise is VERY loud in the cabin and occurs as the compressor kicks in. The resonance is the trim vibrating(Had to zip the two files due to upload protocol but they are just simple .wav files. Let me know if you can hear them OK).
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