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Jaguar XK8 turns and won't start - no spark - Solved... kinda

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XK8 / XKR ( X100 ) 1996 - 2006

Jaguar XK8 turns and won't start - no spark - Solved... kinda

 
  #81  
Old 03-06-2019, 03:30 PM
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Aaand the cold start issue is still with the damn switches It might not be the rotary switch, but still...

The symptom now is that while cold there is a gearbox fault (p0706) and the car is in limp mode (4th gear only). Once it heats up it stops the limp mode and moves to some kind of restricted mode (no kickdown and limited acceleration, but normal gear changes) with codes p1797 and p1798. Later in the day the car would not have any restriction - to this point I havenít checked what error codes are left then.

Soon I will replace the J gate, to eliminate it as a suspect and then if this doesnít help we will start looking at possible harness issues between the rotary switch, j gate and tcm.





 

Last edited by kainy; 03-06-2019 at 03:45 PM.
  #82  
Old 03-06-2019, 03:57 PM
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I do not think your problem is in the J Gate i would first check your shifter cable adjustment.

Link to Shifter cable adjustment http://www.jagrepair.com/images/TSB/307-01-1.pdf
 
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  #83  
Old 03-06-2019, 04:05 PM
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I believe that was done already and I think they did it again at the dealership when they changed the rotary switch, but I will double check and to be sure will ask my mechanic to do it again per this procedure. Thanks!
 
  #84  
Old 03-06-2019, 04:53 PM
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Put your shifter in the manual mode to position I think #4 on your car and drive it and see if it still acts up. Not to worry the trans will up and down shift as it sees fit to do.

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  #85  
Old 03-06-2019, 07:35 PM
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Understand that your “J” gate moves the transmission shifter cable on the left side of the transmission and in turn moves the linkage internal to the transmission to the left side where it moved the transmission rotary switch that sends a signal to the transmission control module that sends the information to the engine control module and the “J” gate. So in short the “J” gate is just a light telling you what gear it is in. Look at figure 5.1

Link http://jagrepair.com/images/AutoRepa.../jagxk1997.pdf
 
  #86  
Old 03-13-2019, 12:55 PM
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Default XK8 no light up due to fuel pump no elec

Originally Posted by Lady Penelope View Post
Have you tried a " Hard Reset " of the security system by removing both battery cables and putting together . This resets the system to zero state as it may have got out of sequence in your tinkering .

Pulling print for 97

http://www.jagrepair.com/images/Auto.../jagxk1997.pdf see right side page 33 for ignition relay

The ECU provides a ground to close the relay as the control power source is from fuse # 14 / 10 amp Engine Management fuse box different then the main coil power source of fuse # 18 / 10 amp Engine Management fuse box
Hello Lady Penelope,
I've tried it all. Hard ECU reset, earsing the TDCs, checked all c/b.
The starter turns, but there is no light up. When I turn the contact key, the fuel pump doesn't function (there is no voltage on the cables).
Any idea where there could be a relay or anything else?
Thanks a lot for your hints and help. Take care
 
  #87  
Old 03-13-2019, 01:50 PM
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