Question about Jaguar XJ12

2 Answers

Hello expert, my recently bought XJ12 (XJ81) constr. 1994 fails to control the car´s height at all. Bleeding the hydraulic (HSMO) systen seems to be nearly impossible as very low (if any at all) pressure is built up when lifting the sensor link rod by 20-30 mm during engine run for several minutes. There is enough hydraulic fluid in the reservoir and the strut assy. shows no leak. Here in Austria I could not find good advise - the simple solutions like filling up the system dont really help. The few people faced with the similar problem either sold the car or changed to standard suspension parts. I would like to keep the beautiful car´s original condition - therefore... I would appreciate your help in this matter. Sincerely Heinz

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  • 5 more comments 
  • tecinform Aug 30, 2010

    Hi, thank you for the reply.
    maybe (and it is very likely) the shocks have to be replaced - even if they are hard to find. But does this explain the lack of hydraulic pressure? I am afraid I will spend a lot of money and work in changing the shock absorbers and then...
    Please think about the pressure as well. I was unable to bleed the line because of this. There must be more...

  • tecinform Sep 01, 2010

    Hello,
    Rear Suspension ride levelling is deleted from VIN 682123? My XJ12 VIN 690108 got it. However, I still have the ride levelling system and the problem.

  • tecinform Sep 01, 2010

    My car is in original condition (no changes or "improvements" have been made), performs perfectly and all electronic and other features work as they should. So I want to keep the levelling system. Changing the dampers alone will not solve the poblem.

  • tecinform Sep 01, 2010

    Hello,
    you did not receive my reply?
    What I thought was: Most likely the shocks are defect This seems (and seemed always) to be clear. What bothers me is the fact that bleeding the hydraulik pressure line to the shocks shows low or no pressure. So when I install new shocks, they will be defective within a few miles of bad road.
    Without sufficient (about 100 bar) hydraulic pressure the shocks will sit on their diaphragm which will be destroyed in short time.
    So, this is the status.

  • tecinform Sep 01, 2010

    Hi,
    this is not an air powered system. It works as already mentioned with hydraulic high pressure.

  • tecinform Sep 01, 2010

    Somebody who is a real Jaguar expert?

  • tecinform Sep 01, 2010

    The only compressor in this car belongs to the air conditioning

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  • Jaguar Master
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I have experience with a 1976 Cadillac Seville which has an air pump that is operated by vacuum and pump air into lines that way.

Also have experience with a 1999 Ford Expedition that uses and electric pump that pumps air into lines that way.

Also, have experience with a 1997 Cadillac Deville Limousine that uses an electric pump.

And, I have experience with a 1990 Cadillac Deville that has an electric pump.

I looked up the recalls on the XJ12 from 1994:

Rear Suspension ride levelling is deleted from VIN 682123.

Only the rear part of the pump remains which controls power steering.

Posted on Aug 31, 2010

  • Duane Wong
    Duane Wong Sep 01, 2010

    I think your low hydraulic pressure is the source of the problem, and not the shocks if they are not leaking. But, I'm thinking of it purely from the point of view of physics.



    If they deleted the rear suspension ride leveling from VIN 682123 on up, this tells me that they may have been having technical difficulty with it back in 1994 when the car was made.



    I don't really know why the pressure would be low, except maybe the pump doesn't seem to be designed or built well enough to do provide enough pressure.



    But, this is pure conjecture.



    Usually, the ride height control systems that I'm familiar with use air pressure and not hydraulic pressure.



    So, I'm a little bit out of my field on the Jaguar system of 1994 or so.




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  • Expert
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Hi! The real cure for this is to replace the hydraulic shocks. Yes the there is no leak but when the shocks is faulty it fails to give the desired ride height. Once the hydraulic is replaced you'll be good. Hope this helps and thank you for using FixYa!

Posted on Aug 30, 2010

  • 1 more comment 
  • dj_relly999
    dj_relly999 Sep 01, 2010

    Hi! How's it going?

  • dj_relly999
    dj_relly999 Sep 01, 2010

    Alright, please try to check the relay under the hood if it's blown. Usually the air compressor relay is #4 on the box. Please write back on the progress.

  • dj_relly999
    dj_relly999 Sep 01, 2010

    It's a wear and tear thing and things may go bad in any given time. If the relay is not bad then it's gotta be the compressor.

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