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?

 

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.

 

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.

 

Worth checking fuel trims hopefully to rule them out.

 

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.

 

Perhaps... I've not seen it mentioned before, though. You'd still be wondering why all the other ones don't appear to do it and of course the source of the vibration.

 

Does it occur at 1200rpm only and in all gears at the same rpm?
See my thread on possibly the same issue

 

I never really noticethe RPM but at the speeds it happens like city streets that seems about right. I will pay more attention to RPM tomorrow. Glad someome else has noticed it.

 

I never really noticethe RPM but at the speeds it happens like city streets that seems about right. I will pay more attention to RPM tomorrow. Glad someome else has noticed it.

 

I just drove to work, and noticed yes, the vibration or buzz, is around 1200 RPM and normal acceleration and is gone by 1400. I see someone has something similar on their 3.0 so as we have it on 4.2's it would to indicate not engine related.

 

What about the latter part?

 

Just went for a drive and tried it through the "J" Gate manually, once again it happens just at the 1100-1300 range.

 

That may rule out (aargh, my brain hurts, do I mean in?) most of the engine & engine bay.

Propshaft? A bearing (wheel or other)?

 

@ 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

 

Have you tried something really simple like changing the height of the pedal to see if that makes any difference?

 

You feel it in the pedal, but also you can feel it in the floor near the pedal. It is just that you foot is on the pedal.

 

Ditto on Daro31's remark. The vibration does not appear to be the pedal as it's in the floor as well.
The vibration occurs on both trips of the rpm gauge up and back down at that 1,400 rpm range. There is no loss of acceleration power.

 

Try driving with the AC off to see if you still feel the vibration?
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Hey, did you ever figure out what the issue was? I'm having a similar issue with vibrations, I can feel it in the pedal as well as the steering wheel. So just wanted to check if you zeroed in on something.

Thank you!

 

Do an advanced search on "front wheel hub" under the "S Type" subdirectory. There are quite a few threads about it. See if anything you read sounds familiar.