Question about 1995 Jaguar XJ6

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Jaguar XJ6 1997 Model cutting out

If the car is left idling .. it will cut out after a few minutes .. also if the trottle is moved for higher revs very quickly it will cut out .. new spark plugs have been fitted .. looking at the crank shaft output at the moment .. I am using an oscilloscope so I can see the signal coming out of the sensor .. at 800 rpm I get approx. 7 volts peak to peak .. I think this might be too low .. also I think the output is getting smaller as the engine heats up .. output of sensor is proportional to rpm .. so if cutting out for some other reason the output of the sensor will reduce .. and I may be on the wrong track ..

Appreciate any help ..

Posted by on

  • mentalcars Nov 07, 2008

    The reply from alicantecoli is appreciated .. but I appear to have fixed the problem .. and this is thanks to a separate posting on FixYa on Sep 15, 2008 .. Solution # 2 ( dont know who posted it )

    This guy discovered that the make of spark plug is most important .. he went to the main dealer and Jaguar recommended Champion plugs .. it fired first time and was problem free .. he says ' Apparently you can only use Champion or Bosch spark plugs as the engine doesn't like the cheaper ones ?!?!?!

    I agree .. my car was being ripped apart .. everything being suspect .. I asked Jaguar what were the best plugs .. fitted them and it fired first go and is driving perfectly. I also put in 6 new gaskets under the coil packs .. the mechanic had said to leave out the worn ones .. thanks to all in FixYa

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  • 21,949 Answers

On the wrong track on this one ,,,reckon its a problem with a fuel sensor but not sure check air filter hasnt collapsed in on its self and its blocking off the air ,or one case scenario i had once was a plastic shopping bag in the air intake where it draws in air behind the headlight ,tickover was ok at first then lumpy and slowed down and engine wouldnt rev quick but it would do if revved slowly and the tell tale was the black smoke ,rich mixture but i will be honest it had me going and took nearly an hour to work it out

Posted on Nov 04, 2008

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