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XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

V12 6.0 idling high

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Old Nov 7, 2011 | 12:53 AM
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Default V12 6.0 idling high
Hello. New member here from Sweden!
I have probolem with 6.0L V12. When cold engine is idling about 1600rpm. After around 5 minutes itīs normal and about 750rpm. Is it possible to adjust the idle when engine is cold?
 
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Old Nov 7, 2011 | 11:44 AM
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its called open loop. as far as i know theres no way to adjust it.
 
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Old Nov 10, 2011 | 02:54 PM
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Originally Posted by jaguarlars
Hello. New member here from Sweden!
I have probolem with 6.0L V12. When cold engine is idling about 1600rpm. After around 5 minutes itīs normal and about 750rpm. Is it possible to adjust the idle when engine is cold?
Sounds like a failed Extra Air Valve to me. The large screw/bolt on it is used to adjust the warm idle, the cold idle is controlled by the valve.

Cheers,
 
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Old Nov 14, 2011 | 05:27 AM
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I have replaced the valve with a new one but it doesnīt help. Well car runs perfect when hot so maybe I should be satisfied!
 
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Old Nov 14, 2011 | 01:17 PM
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The issue you discribe is the cold engine boost from the Auxiliary
Air Valve. It sounds like it is working just as it is meant to.

If you do not want it I could use it! Mine is stuck and I idle 2000 RPM and it does not come down ever.
 
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Old Nov 14, 2011 | 01:20 PM
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After reading your post again it looks like you might have 2 that work,
what would you want for one of them?
 
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Old Nov 21, 2011 | 09:54 PM
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Does the V12 has idle control valve to control the idling?
 
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Old Dec 15, 2011 | 03:59 AM
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Originally Posted by kev's xjsc
After reading your post again it looks like you might have 2 that work,
what would you want for one of them?
Sorry, but my customer took it with him. I might be able to get one more. drop me a mail if you are still interested!
 
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