XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

vacuum leak, rough idle?

Old Jul 9, 2011 | 08:58 PM
  #41  
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As I recall mine idled at about 15-17" vacuum.

The fuel interface unit translates injector pulse width into some sort of language that the trip computer can use to calculate fuel economy. I don't think it has anything to do with your problem...but then again I don't know exactly how it works, so.....


Cheers
DD
 
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Old Jul 9, 2011 | 09:35 PM
  #42  
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Just before it died, we could make the engine produce 17 at idle as long as we had a vac pump on the computer at 20-22. So a bad ECU isn't such a bad thought eh?

I don't have a trip computer, so I guess I don't have a fuel interface unit to worry about. Thanks!
 
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Old Jul 12, 2011 | 12:26 PM
  #43  
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I have another question, can an ECU from an XJ6 be used on a V12 XJS? I'm thinking probably not, but I gotta ask...
 
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Old Jul 12, 2011 | 01:07 PM
  #44  
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Originally Posted by JameyXJ6
I have another question, can an ECU from an XJ6 be used on a V12 XJS? I'm thinking probably not, but I gotta ask...


Nope ! :-)


Cheers
DD
 
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Old Jul 12, 2011 | 06:52 PM
  #45  
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oh well, was worth a shot.
 
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