Need Technical Advice

[Tom_Keohan@nps.gov (Tom Keohan)]

     I have just subscribed to the jag-lovers mailing list and hope that 
     someone can help me with a few technical questions.
     
     I have owned several Jaguars over the years and have restored two 
     E-Types. Cars I have owned include 1969 E-Type OTS, I restored to 
     Concours; 1966 E-Type FHC restored to concours (still working on 
     this one); 1967 420; 1961 XK150 FHC; 1980, 1983, 1984, 1985 VP, 
     1986, 1987 XJ6 Series III; 1988 XJ40; 1989 XJS Conv. 
     
     I presently have three Jaguars and have a perplexing problem I hope 
     that I can get some help on. The following description are problems 
     on my 1984 XJ6, can anyone help? 
     
     1.  I notice a clicking sound from behind the dash facia just left of 
     the trip computer.  The clicking is most prolific when the climate 
     control is off, as if a relay or control module is trying to operate.  
     The clicking goes away when I turn the fan switch to automatic or to 
     one of the speed settings.  The clicking is particularly noticeable 
     when the car is cold, and switch is on automatic. The clicking stops 
     when the fan turns on.  Occasionally, a few clicks can be heard with 
     the fan on.  I have reviewed a wiring diagram and can find nothing 
     that suggests a relay or control module related to the ac/heater 
     control that would account for the clicking. The climate control 
     system works just fine, just this bothersome clicking noise.  I am 
     confused, can you help?
     
     2. Another problem, that may or may not be related is the oil pressure 
     gauge needle swings far left or remains far right.  When the clicking 
     is heard (described above) the needle swings violently left to right 
     in sink with the clicking sound (or so it seems).  Other times the 
     needle rests far left or right.  Is this the oil pressure sending unit 
     causing the problem with the gauge?  How is the gauge related the  
     clicking sound?  I have reviewed wire diagrams for the car and I see 
     no relation between the oil pressure gauge and heater/ac controls.
     
     3.  I have owned several XJ6 III and have noticed on all of them a 
     rough idle.  There is a definite miss as the car idles, sometimes more 
     noticeable then at other times.  This has been a common characteristic 
     of all 6 XJ6's (4.2) I have owned.  I have replaced spark plugs, tried 
     different gas.  My experience suggest this is common.  Should I 
     replace the distributor cap and rotor, spark plug wires, timing or 
     should I look to a fuel problem?
     
     4. Another problem is that the car "floats" on the road and When I 
     make a corner the steering wheel stays cocked to that direction on the 
     straight. I just got an alignment and I now suspect worn rack 
     bushings. 
     
     Any assistance, and your comments would be greatly appreciated
     
     Thank You
     
     Tom Keohan
     tom_keohan@nps.gov

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