Vibration in Accelerator Pedal
#1
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I have a vibration in my accelerator pedal on the 2008 Stype 4.2 it is very noticeable as a high frequency vibration in the pedal when feathering the accelerator at 30-40 mph. The way you drive in city traffic. It is not there on acceleration and not their on the highway on cruise control. Hard to describe but it is there. I have done the transmission oil change. No effect, rear end Oil change no effect. I have had the car for almost 2 years and 30,000 km. and it has never changed. I have a 2004 XK8 with the same power train and do not have the issue. Does anyone else share this issue or ever found a fix?
#2
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Must be rare - possibly unique.
As the pedal is basically sprung hinged metal with two sensors you're looking for another source of the vibration.
Engine, trans (not so likely), belts/pulleys (presumably those driven by the engine), steering/etc (rack, wheels etc) and so on.
Does the MIL flash during this? (Sever misfires if so.)
Any codes? May be wise to read all the modules.
Cheap to get an elm327 so you can check fuel trims.
Obviously check tyres carefully in case odd pressure / lumps / etc.
Also check suspension.
hmm, could be propshaft/etc I suppose.
As the pedal is basically sprung hinged metal with two sensors you're looking for another source of the vibration.
Engine, trans (not so likely), belts/pulleys (presumably those driven by the engine), steering/etc (rack, wheels etc) and so on.
Does the MIL flash during this? (Sever misfires if so.)
Any codes? May be wise to read all the modules.
Cheap to get an elm327 so you can check fuel trims.
Obviously check tyres carefully in case odd pressure / lumps / etc.
Also check suspension.
hmm, could be propshaft/etc I suppose.
Last edited by JagV8; 03-19-2018 at 11:51 AM.
#3
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I have an ELM 327 which is always on, no codes, can't think of any relationship to that, seems like a mechanical / power train issue. Not a tire issue, the snows or the summer tires no difference. Did new wheel bearings, no difference. It is a high frequency vibration, not like something related to tires but you do het me thinking about something driven by the serpentine belt. It is about due for a change so perhaps I might check out power steering pump water pump bearings etc. Thanks.
#4
#5
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Could it be the pedal assembly itself? I realize it's a purely electric input, with no feedback. But maybe the return spring is weak, the pivot bushings are worn, or who knows what. Perhaps something like that could cause the pedal to amplify some small, normal vibration that would otherwise go undetected.
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@ Daro: I have similar pedal vibration on my 2008 XK convertible occurring at 1,200-1,400 rpm when accelerating or stationary in 'neutral' or 'park'. Very annoying.
see Jag Forum of Malt 5/8/17 where he states "the diagnosis was that the vibration is an issue with the torque converter / transmission hunting gears. Transmission had to be warm for it to show and it threw no codes. So first solution was to reload the software for that module, they thought it could be a SW (software) glitch that confused the computer just at that particular rpm. That fix has made it almost go away; "
Al Mazzorana
see Jag Forum of Malt 5/8/17 where he states "the diagnosis was that the vibration is an issue with the torque converter / transmission hunting gears. Transmission had to be warm for it to show and it threw no codes. So first solution was to reload the software for that module, they thought it could be a SW (software) glitch that confused the computer just at that particular rpm. That fix has made it almost go away; "
Al Mazzorana
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#19
![Default](/forum/images/icons/icon1.gif)
I have a vibration in my accelerator pedal on the 2008 Stype 4.2 it is very noticeable as a high frequency vibration in the pedal when feathering the accelerator at 30-40 mph. The way you drive in city traffic. It is not there on acceleration and not their on the highway on cruise control. Hard to describe but it is there. I have done the transmission oil change. No effect, rear end Oil change no effect. I have had the car for almost 2 years and 30,000 km. and it has never changed. I have a 2004 XK8 with the same power train and do not have the issue. Does anyone else share this issue or ever found a fix?
Thank you!
#20