Hi guys,

So far I have just been driving my XJR.

I haven't done anything to it but had the
oil changed and a weird noise from under the
rear end inspected (+ MAF cleaning and fuel filter),
so not quite like the XJ Sport's ownership. I am
just happier with the car in all I'd say.

I had the traction control off the other day,
and it was raining. I gave it some throttle,
30 percent-ish, and the right rear wheel let
go. I just decided to see how long it would keep
spinning, it was absurd! Well after about 4 seconds
a mechanical, turbine-like noise would come from
the back of the car.

I let off, and accelerated normally, and there
was no more turbine sound. Any time the
rear experiences slip though, it is barely any
time at all before the turbine sound begins.

The diff is silent under cruising and spirited
running too. Is this turbine-like sound
something that comes from an aging diff
heating up? Or just an XJR diff? I never heard that
sound when I let the rears go in the XJ Sport in
the wet. But then again its parts had less miles
on them.

On a seperate note, I still have an unsolved slamming
sound from the rear. it is not a jurid coupling
(I hit the brake and gave it gas, no slamming.) You
can hear it from in and outside the car, when you
jab the gas in any gear. My mechanic said it was
probably an accessory, but it feels directly connected
to the rear end somewhere. Thanks for the advice,
if not on that weird mystical noise.

Many thanks,

Ian

 

Anyone have any advice? This thread is fading
into obscurity

Yes, I have viewed the pre-existing threads about
differentials, my case doesn't sound typical

Ian

 

Looking for some advice here! I guess I'll just report back with what
the mechanic says after I eventually get an appointment. Or maybe
I won't bother

 

If someone does not get a bite on their thread, it is sometimes because there is no one who has had a similar experience. The timeline on your thread shows a bump in less than 24 hours, and the above quote in just under 72 hours.

If you choose not to reveal the diagnosis as suggested by your latest post, then that would indicate that you regard your participation on JF as a one way street.

 

Here here,

Maybe take a video of the sound, never heard of your fault so any additional info would be of help in diagnosing.

To expect a wave of suggestions and help at this stage, getting into a strop and behaving like a teenage girl when it doesn't appear isn't the way to get the car fixed, is it?

 

As for the slamming noise, I don't know the exact details of your noise, but my car felt like it had a lot of free play in the drive train. When I would come off the gas and the transmission upshifted to 3rd gear, it shifted with a strong bang that felt like it was coming from only the rear end. It was probably made worse since my rear suspension is very loose and needs a overhaul. (I only knew it had to be the transmission and not the diff only because of prior transmission problems. It didn't feel like it was coming from the transmission at all). My MAF eventually totally failed and caused a serious misfire. When I replaced it (new off ebay for like $35), the misfire was gone and surprisingly the drive train free play feeling was gone.

The turbine noise could be tires? Most likely you have different tires than those on your XJ Sport. The rear diffs on these cars don't seem to fail extremely often like tensioners, cooling issues, or ZF transmissions.

 

plums,

I'm not really the resentful hag of JF. Of course I will
post anything useful I find out! I'm just very used to
there being like 5 extra-helpful responses in a short time.
I felt like a neglected housewife.

Sean B, since I fear for the diff's health, (and the cost
of those 255 rear tyres!) I don't really want to do a
burnout or anything, at the risk of causing further damage.
(it is now rain-free, and doing wheelspin will be extra-hard
on the car)

So I am going to be scheduling an appointment, I should
know something after I run it past the mechanic.

Ian

 

I haven't experienced what you are but I also am fearing for my differential. my car sounds like a bicycle with a playing card clipped on the spokes whenever you are off the throttle, any time while gliding or slowing down. It isn't a terribly loud noise, but you certainly notice it with the radio off.

 

had the car to the mechanic today. Dropped it off in the
morning, he couldn't get to it 'till around 5:00,

but after he drove the car, he said it was obvious and
could be felt at just about any time.

We were both under there, and with a flat-headed long
screwdriver, we were able to move the diff around and hear
a toned-down version of my lovely slamming.

The only thing that was moving... the bolts.


After he tightened everything up, (the main culprits being
outlined in the attached pic), I drove the car off of the lift, and
immediately the drivetrain play, and loud noise were gone.

Easy fix! Despite him spending time on the car, and driving
it... he charged me a grand total of $0.

I offered to put an ad for him in the Jaguar Club of Tulsa
newsletter. I always recommend him to a friend anyway
though... So like Captain Picard says, I'll "Make it so."

this concludes my rear-end noise story.

Hopefully the car never ever ever needs a diff rebuild
ever. (Too many dollars. I want a Jaguar racecar as
my 2nd car, not big jobs to do on my XJR)

Happy motoring! Time for a fun weekend.

 

what condition were the bushes like on the cross brace Ian? like the nice easy fix, and from the rear axle picture you can see just how many parts that could cause a knock, even with the A frame and prop missing...

 

The rear end had to come out to tighten those bolts???

 

Nooo! you can do it on a creeper with the car on stands or ramp is preferable

 

Sean, you are quite right. Lots of little bits on
the rear end that can collide with something else
as the rear end is loaded up/ unloaded from the
engine's torque.

+1 Sean... I didn't need the rear end out, heima!

That would actually involve removing the very bolts
I went in to tighten. I just used that photo so it was
clear to see where those little culprits were.

The job was completed with the car way up on a rack.

Ian

 

I might try this tomorrow, I looked at it and it looks very tight, but I'll jack her up and give it a shot. my rear end noise is really starting to annoy me

 

The bushings! Ah! Forgot to answer that one. they were a little hard,
but they looked ok. They were a reddish colour. I didn't see any that
were apparently failed.