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1988 xjs coupe-cycles between 100 to 400 rpm when in idle

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Old 03-24-2014, 10:18 PM
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Default 1988 xjs coupe-cycles between 100 to 400 rpm when in idle
Hello..im back again and looking for your advice. I started my jaguar and it cycles between 100 to 400 rpm when in idle. Pressure regulator psi fluctuates between 30 to 35 psi...is that normal. Does it means my regulator needs replacement ?My fuel pump is brand new
 
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Old 03-25-2014, 02:51 AM
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Does it do this when warm, all the time? And do you really mean 100 to 400 or 1,000 to 1,400?

Greg
 
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Old 03-25-2014, 10:04 AM
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2000 and 4000 rpm on idle. I think it stops after the engine is warm
 
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Old 03-25-2014, 04:22 PM
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Sounds like your air idle valve is trying to give up its job.
 
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Old 03-25-2014, 05:46 PM
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Is the idle rough at 400 rpm?
 
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