XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Fast idle?

  #1  
Old 11-22-2009, 01:22 PM
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Default Fast idle?

Hey guys and gals. I'm trying to track down the cause of a fast idle of around 1100rpm. So far I have eliminated the extra air valve, throttle bodies and linkage and vacuum leaks. My idle adjustment is turned all the way in so I have no more adjustment left there. My knowledge of the V12 is limited so I'm wondering if I could be missing a sensor or some other component that could cause this. Forgot to mention I also re-torqued all the intake manifolds.
Thanks in advance for any help you can offer.

John
1990 XJS
 

Last edited by johnlittle01; 11-22-2009 at 06:03 PM.
  #2  
Old 11-23-2009, 09:52 AM
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Hi John,have you checked the coolant temp sensor(beside the left thermostat) and the air temp sensor(left air filter housing trumpet)
Good luck
Les
88 1/2XJ-S
 
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Old 11-23-2009, 12:04 PM
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Not yet but I'll check them next.
Thank you......
 
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Old 11-26-2009, 01:03 PM
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Culprit was the extra air valve. Cleaned, lubed and reinstalled.
 
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