[Vwdiesel] Idle hunting: was: Pump

[Will Taygan]

My 1981 pickup "hunted" up and down at idle until I put in new injectors
a few years ago.  Solved the problem.

Will.

On Tue, 2007-07-10 at 10:49 -0700, Bob Soukup wrote:
> Rudy,
> 
> My '81 Rabbit Truck has been "suffering" with something similar to what 
> you describe ever since I had the inj pump overhauled a number of years 
> ago.  I would describe what mine does as "hunting" for a stable idle 
> speed.  When the pump came back from the overhaul the idle was set very 
> high.  I had to back the idle screw out almost all the way to get a 
> reasonable speed.  I finally set the idle a little fast so the truck 
> doesn't vibrate so bad with the AC running.  The idle still hunts with 
> no load, keeping the headlights on loads enough to calm it down.  
> If/when you figure out what is causing your problem, please let me know.
> 
> --
> Bob Soukup
> 
> 
> You Wrote:
> 
> I just changed Head Gasket, Timing Belt ect. on an 81 Rabbit, new seals on
> Cold Start and Input Shaft.  Timed it around .98mm.  It idles fine and
> smooth, when I start out and first step on the trottle it wants to rev
> higher and back down and doesn't stay stable.  No other way to describe it.
>  
> It acts kind of like a gas car that is timed to far advanced.  It revs a
> little ahead of the trottle if that makes any sense.  Once I get going at
> speed or a little higher trottle position it seems to smooth out and goes
> down the road fine.  Almost seems to me like the advance in the pump is
> coming in to early or at least feels like it anyway.  I hope this makes
> sense to someone.  Wondering if initial advance is set to high for this
> pump.  ??
>  
> Rudy
> 
> 
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