XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Alternate Idle air control valve?

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Old 12-16-2018, 04:19 PM
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Default Alternate Idle air control valve?

So I think my idle air valve on my 93 xjs is bad, and looking online I see that people suggest using a Lucas one, but I also see they are $200 each. I know there is a "alternate parts" listing for older v12s, but I haven't seen alternative parts listings for six's or facelifts. I did see one for $13, but it had bad reviews. There are several that I saw that looked exactly like them, but hard to tell from the pictures.
 
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Old 12-16-2018, 04:30 PM
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So, I'm assuming you have a 6-cylinder car, yes?

Google "DBC5727 Jaguar". There are a few out there including a couple new ones

Not aware of an 'alternate', personally, but i'm not versed on much 6-cylinder stuff

Cheers
DD
 
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Old 12-16-2018, 04:39 PM
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Ok cool Ill look! Yes its a 6cyl facelift car.
 
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Old 12-16-2018, 09:37 PM
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Originally Posted by Timeisrelative
Ok cool Ill look! Yes its a 6cyl facelift car.

Before you buy a new one, take the old one out and test it with boiling water.

I wish I had of done that as I ended up buying anothre one for nothing

 
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Old 12-16-2018, 10:32 PM
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Originally Posted by Crackerbuzz
Before you buy a new one, take the old one out and test it with boiling water.

I wish I had of done that as I ended up buying anothre one for nothing

what do you just put it in boiling water and it moves or something?
 
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Old 12-16-2018, 10:39 PM
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Originally Posted by Timeisrelative
what do you just put it in boiling water and it moves or something?
Yes. Use a heat gun or fill a cup with boiling water and dip the copper bulb into the water and you should see a valve slowly shut from the side inlet.

When it cools back down it should re-open.

Video here:

 
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Old 12-16-2018, 11:34 PM
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Cool! Ill try that tomorrow!
 
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Old 12-17-2018, 12:18 AM
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I believe the idle valve on the 6 cylinder models is a stepper motor controlled by the ECU. Putting that in hot water will for sure not do anything good. For the V12 the recipe is correct though...

I took mine on the XJ40 apart a long time ago, cleaned the internals, greased it up and it has worked ever since.
 
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Old 12-17-2018, 12:30 AM
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Originally Posted by leo_denmark
I believe the idle valve on the 6 cylinder models is a stepper motor controlled by the ECU. Putting that in hot water will for sure not do anything good. For the V12 the recipe is correct though...

I took mine on the XJ40 apart a long time ago, cleaned the internals, greased it up and it has worked ever since.
Ah gotcha! I kinda wondered about that! Maybe Ill just pull it and try tearing it apart to see what I can see!
 
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Old 12-17-2018, 01:02 AM
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Originally Posted by leo_denmark
I believe the idle valve on the 6 cylinder models is a stepper motor controlled by the ECU. Putting that in hot water will for sure not do anything good. For the V12 the recipe is correct though...

I took mine on the XJ40 apart a long time ago, cleaned the internals, greased it up and it has worked ever since.

Ooops my bad!

Didn't read properly.

Presumed she was a 12. I am sure you would have seen the difference anyhoo



 
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