• Advertisement
Xclusively Jaguar
SNG Barratt
David Marks Garages
Make a donation to XJ40.com

Question of curiosity

Lightweight
Posts: 46
Joined: Sat Dec 16, 2017 3:07 am

Question of curiosity

Postby Lightweight » Thu Oct 25, 2018 3:55 am

While I have bigger fish to fry such as a gearbox problem I am wondering how noisy the abs should be in a 94 XJ81. The brakes work well but on the odd occasion where I think stopping the old girl is a bit much, generally at slow speeds on junctions where the camber does odd things to the traction, the abs seems to kick in and it sounds like the front valance is dragging on the ground. Not a good sound or image for the lady. I'm assuming this is not normal so what could it be an indication of?
Thanks Andy
1993 (94-MY) XJ81 VIN - 67xxxx
Salt Lake City, Utah.

Morgan1
Posts: 164
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Question of curiosity

Postby Morgan1 » Thu Oct 25, 2018 7:34 am

Not sure what is fitted to the xj81, but previously I have had this on another car. The fault then was a rusty/damaged ABS ring. The sensor picks up pulses from the ring as it spins when you travel. If the sensor or the ring are worn/ damaged the the car thinks the wheel has lost traction and applies the ABS. Could just do with a clean? As I say, I'm not sure what wet up is on the '81 but it must have sensors so try there first. Cheers Craig
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

Lightweight
Posts: 46
Joined: Sat Dec 16, 2017 3:07 am

Re: Question of curiosity

Postby Lightweight » Fri Oct 26, 2018 4:47 am

I will check the sensor and ring as it does seem to be more sensitive than it should be but the real issue is the awful noise. It really is bad. It sounds like dragging all the plastic underside over the curb.
1993 (94-MY) XJ81 VIN - 67xxxx
Salt Lake City, Utah.

donkeyotty
North Wales Rep
Posts: 5421
Joined: Fri Jul 30, 2010 9:39 pm
Location: North Wales

Re: Question of curiosity

Postby donkeyotty » Fri Oct 26, 2018 8:50 am

Just thinking out loud, could it be your tyres rubbing on the wheel arch liners ????
1994 Regency Red 4.0 Sovereign M117FVC Chassis 705979
1993 Volvo 940 2.0 Turbo Wentworth Estate (Daily)

Lightweight
Posts: 46
Joined: Sat Dec 16, 2017 3:07 am

Re: Question of curiosity

Postby Lightweight » Tue Oct 30, 2018 3:04 am

It is only under sharp braking so I think it is the abs. Maybe more sensitive than I would expect so I still need to check the sensor but the real issue is the noise and volume. It isnt the usual stutter from modern abs systems or even my 99 Durango but a very loud plastic on gravel style grinding. I will have to find somewhere out of the way to try and record it as it is loud enough to have everyone looking on a public road.
Thanks for all the ideas to check out though.
1993 (94-MY) XJ81 VIN - 67xxxx
Salt Lake City, Utah.

Lightweight
Posts: 46
Joined: Sat Dec 16, 2017 3:07 am

Re: Question of curiosity

Postby Lightweight » Thu Dec 13, 2018 5:05 am

Finally identified the source of the noise, unfortunately I was a little to late. The fan shroud had come lose and now I have a smashed fan blade and trashed shroud.
Waiting for replacements from the UK courtesy of SNG.
I also have to try and get her through emissions again. 7 months and 600 miles from the last test and she has failed again. Very high HC at idle but normal at 2000 rpm.
I think the previous garage mave have done something 'special' to get her to pass last time. Idle is slightly rough and exhaust doesn't smell good.
1993 (94-MY) XJ81 VIN - 67xxxx
Salt Lake City, Utah.

naki_k
Super Moderator
Posts: 28654
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Question of curiosity

Postby naki_k » Sat Dec 22, 2018 11:15 pm

Lightweight wrote:Finally identified the source of the noise, unfortunately I was a little to late. The fan shroud had come lose and now I have a smashed fan blade and trashed shroud.
Waiting for replacements from the UK courtesy of SNG.
I also have to try and get her through emissions again. 7 months and 600 miles from the last test and she has failed again. Very high HC at idle but normal at 2000 rpm.
I think the previous garage mave have done something 'special' to get her to pass last time. Idle is slightly rough and exhaust doesn't smell good.


So it’s overfueling then.
Have you checked the VCM for fault codes? It’s likely Coolsnt temp sensors/ Oxygen sensors at fault?
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

XJ4081
Snr Member
Posts: 216
Joined: Fri Oct 23, 2015 12:12 am
Location: Germany (South-West)

Re: Question of curiosity

Postby XJ4081 » Sun Dec 23, 2018 12:06 am

Lightweight wrote:Finally identified the source of the noise, unfortunately I was a little to late. The fan shroud had come lose and now I have a smashed fan blade and trashed shroud.


Are you sure the fan shroud just had come lose by itself? When you described that ABS-like noise I had to think about the noise my XJ12 made when the engine mounts were through. As a consequence the engine was tilting towards the fan when braking sharp, grinding some of the fan blades.
1993 XJ12

Lightweight
Posts: 46
Joined: Sat Dec 16, 2017 3:07 am

Re: Question of curiosity

Postby Lightweight » Mon Dec 24, 2018 5:12 pm

Sorry for the late reply, just returned from a UK visit.
I'm not getting any error codes and the O2 sensors were replaced last June. Will look at coolant temp sensor. She still has a very slightly lumpy idle so I have two new coils to install in case they are not working correctly.

As for the engine mounts, what is the best way to check? The shroud was definitely lose but that's not to say the original cause was not it being hit by the fan. I have new mounting hardware on order too as all the ones I found had all decayed.
1993 (94-MY) XJ81 VIN - 67xxxx
Salt Lake City, Utah.