🚀 go-pugleaf

I have a 79 rabbit that has had idle speed problems from time to
time.  The problem comes in two forms:

1)	Idle is unstable.  If you start above a certain RPM, the
	idle speed increases until it gets excessivel.  (I don't
	have a tach, so I don't know how high it goes, but it's high
	enough to be loud, but not higher than it goes during normal
	driving.)
	
2)	Idle speed warbles.  The idle varies cyclically, going up
	and down.  In the extreme form, the car stalls on the low
	part of the cycle.
	
These problems are temperature dependent.  The higher the outside
temperature, the worse the effect.  This has always happened to me
after lots of miles without service, and near a time when I was
going to bring the car in for something anyway, so I have just taken
it to vw, and they fix it promptly.

It would seem like some sort of negative feedback system where the
gain gets out of whack.  Setting back the timing helps a little, but
you can't stop it that way without going beyond the normal timing
setting.  It can't be very tough to fix, since in one case the fix
was applied very quickly and for no apparent charge.  The service
manual doesn't mention this one, but it appears to be very common,
as I know several people here who have had it from time to time.  I
would be very interested to know what is going on if anyone has any
insights.  My car has 55K miles, and relatively few problems.  (I
had the oil burning fix done ad 45K, and so far everything is fine.)


Warren Montgomery
ihnss!warren