Re: XJ-40 idle speed

[Randy Wilson <randy@taylor.infi.net>]

>I adjusted the idle speed according to the instructions provided by the group 
>on my 1988 XJ-40.  Before adjustment the car would stall with the 
>computerized idle control, ie with the solenoid closed as instructed.  It 
>...
>control reconnected.  Definitely worth the effort.  So both opinions are 
>true..... the idle speed often can not be adjusted, however the baseline idle 
>speed produced without computer intervention can.                            
>
>Paul Lacey, TX


Now, before everyone goes out and mucks about with the base idle settings...

The fact that the engine would not run in base-idle mode tells me one of
two things:

 A> Someone has previously mucked with the settings in a vain attempt to
     fix something. (this does happen a lot)

 b> Something else is wrong, and you just "covered" for it by adjusting the
     base up higher. The two most likely things to be wrong is either a
     gummed up throttle body, or a vacuum leak. And, once this problem is
     cured, you have to go back to A>.


  At race tracks, I often hear people say that they had to reset their 
alignment because an off road excursion "knocked it out". My standard
answer to them is that the rock/curb/pothole/whatever did not reach up,
loosen the locks, and turn the adjusters. Whatever you hit bent something.
Find it and fix it. Or risk a possibly catostrophic failure later on.

 the same thing applies to modern engines (AJ-6). The continous wear items
are long gone. No points to wear. Dwell doesn't change. Timing doesn't change. 
no finnicky carburettors. Idle speed and mixtures should never need adjusting.
If you find that something needs adjusting, first find the root cause.
an AJ6 engine will idle pretty damn good with a large vacuum leak.


   Randy K. Wilson
     randy@taylor.infi.net

---

References:

• XJ-40 idle speed
• From: PLacey@swri.edu

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