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  1. #1
    Junior Member
    Join Date
    Feb 2011
    Posts
    4

    Why does my car hesitate when cruising at 50mph

    Hi,

    I wonder if anyone can help, I have a lwb 1994 Jaguar Sovereign that seems to reach 50 mph ok but when you cruise at that speed or upto say 65mph, the rev's seem to fluctuate even if you don't change the throttle setting and it seems to hesitate to.

    Has anyone come across this before or can anyone provide some direction? I wondered if it might be a throttle position sensor but thought I would see if there was another explanation.

    Thanks

    Mark

  2. #2
    Senior Member
    Join Date
    Nov 2006
    Location
    The naughty step
    Posts
    5,475

    Re: Why does my car hesitate when cruising at 50mph

    As a first place to go, I might suspect plugs or coils.
    2013 XF 3.0S Portfolio with Ivory interior

  3. #3
    Junior Member
    Join Date
    Feb 2011
    Posts
    4

    Re: Why does my car hesitate when cruising at 50mph

    Hi Wilf,

    I am not very mechanically minded but would the plugs or coil only play up between say 50mph and 65-70mph and then be ok? The problem is not under accelertion either but rather when you maintain say 50-60mph.

    Thanks

    Mark

  4. #4
    Senior Member
    Join Date
    Nov 2006
    Location
    The naughty step
    Posts
    5,475

    Re: Why does my car hesitate when cruising at 50mph

    in a word or two - they might. But as I said, that is only one possible cause.
    2013 XF 3.0S Portfolio with Ivory interior

  5. #5
    Administrator 12RM's Avatar
    Join Date
    Oct 2005
    Location
    Scotland
    Posts
    5,411

    Re: Why does my car hesitate when cruising at 50mph

    Could be the auto box.
    ex 2001 S Type 3.0 SE Auto
    ex 1997 X300 3.2 Sport Auto

  6. #6
    Senior Member
    Join Date
    Jan 2010
    Location
    Isle of Wight
    Posts
    170

    Re: Why does my car hesitate when cruising at 50mph

    had similar fault years ago on XJS. Fault was the potentiometer.


 

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