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5KT : Intermittent high idle

In message <199704150642.XAA24525@netcom21.netcom.com> orin@netcom.com (Orin Eman) writes:

> (BTW eventually, the idle screw can fall out causing a fair sized vacuum
> leak and you may have problems starting.)

And a fierce whistle, especially if it happens at speed.

> For those that don't want to measure the current to the ISV, set the idle
> RPM to spec (800 on the 5000 CSQ) with a decent tach (not the dash tach)
> (AC and all electrical consumers off) and you'll be pretty close.
> I found that at the correct ISV current, I got the correct RPM.  Of course,
> if your ISV is in need of cleaning, I doubt this would be the case.

I think it also assumes constant mixture.  If the air mass sensor has been 
tampered with, it may prove impossible to set current and RPM without adjusting 
the mixture.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club