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Jan 23, 2019 22:55:53 GMT
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I've got a jaguar xjs 5.3 v12 in the workshop at the minute with running issues. It will start from cold but will only run for a few minutes before cutting out and then won't start when I go back to it. The fuel filter was changed 2 years ago and I swapped the fuel pump out for another one I had here but it didn't seem to make any difference(it wasn't a jag one but the specs were the same). Any ideas on what it could be?
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Jan 23, 2019 23:27:21 GMT
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Hi, Are you sure it's fuel? I've had the same problem with some electronic distributors (especially Lucas Opus) when they get some heat into them they suffer component failure, when cooled down they're OK again.
Colin
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It's quite possible you're right, I know nothing about jaguars, Japanese marques are more my thing. Of course the local specialists say to bring it to them but I'd get more satisfaction if we could sort it here in house.
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Sounds like it could be the (cold start) temperature sensor, which is ususally located near or on the thermostat housing; if it's faulty, the ECU will cause the car to run too rich until the spark plugs foul up.
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Jan 24, 2019 11:11:20 GMT
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When it cuts out, take an injector out and plonk it into an empty water bottle. Turn it over and see if it fills with fuel. At least you'll then know where to start fault diagnosis!
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Jan 24, 2019 21:01:10 GMT
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I had one for many years, they are not as complicated as they appear. go back to basics, does it have spark and fuel pressure both easy to check, from here worm your way back as you would with any car, mine had a random cutting out issue which was the fuel pump driver in the ecm in the boot, I replaced it witb an engine run relay.
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