[Vwdiesel] Idle hunting: was: Pump

[raymond greeley]

Hello will and all. Is it possible that the set release presure
has changed in the injectors or Ip causing a mismatch within the  injection system. I am trying to understand 
why new injectors helped in your situation and how a similar operating condition could develop when a pump is rebuilt. 
ray> From: william at taygan.com> To: vwdiesel at vwfans.com> Date: Tue, 10 Jul 2007 13:42:18 -0800> Subject: [Vwdiesel] Idle hunting: was: Pump> > 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> > > > > > _______________________________________________> > Vwdiesel mailing list> > Vwdiesel at vwfans.com> > http://www.audifans.com/mailman/listinfo/vwdiesel> > > > _______________________________________________> Vwdiesel mailing list> Vwdiesel at vwfans.com> http://www.audifans.com/mailman/listinfo/vwdiesel
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