Idle speed adjusment screw woes on the 82 4ks

[Huw Powell]

nicksimc wrote:
> 
> I have noticed  that the idle speedadjusment screw on the CIS injection system
> seems extremely loose.  I noticed that idle was dropping really low at the end
> of a
> semi-regular 40 mile commute.  I adjusted the screw (which felt loose), and
> drove back.  Lo and behold, it dropped again.  I re-adjusted the screw and
> made a
> witness mark.  I have driven it under a variety of conditions since then (to
> the store, 40-mile commute, winding roads, etc),  and when the idle has
> dropped, the
> screw has quite visible turned.  When adjusted back to the mark, everything is
> fine again. It seems to happens under wide open throttle conditions and after
> longer drives.
> 
> My questions are:
> 
> Is this a problem with the screw, or is it in the throttle body?

most likely the screw's o-ring, which is sort of not available.

> 
> If it is the screw, can it be replaced without taking off the throttle?

if it is the thing I am thinking of, sure, why not?  it will simply
unscrew all the way out.  This is the screw that sticks into the TB and
blocks some of the bypass air channel.

I think some teflon tape on the threads might be enough to get it to
stay in place - and eliminate any air leaking aorund the hardened o-ring
as well.  worth a try.  a new screw & o-ring should stay in place too.

> 
> If I have to take off a lot of the injection system, I'll probably just end up
> pulling a CIS-E system somewhere and upgrading that now.
> 
> Any info or BTDTs would be helpful.

I did the cis-e upgrade on my 5 cyl coupe, there is extensive
documentation at my web site.

You might want to describe better the screw you are talking about since
the "system" certainly is not in the way of the one I am thinking of.

And, is your car 4 or 5 cyl.?

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/