Date: Mon, 5 Jun 2006 00:02:28 -0400
Reply-To: Benny boy <huotb@VIDEOTRON.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Benny boy <huotb@VIDEOTRON.CA>
Subject: Re: Digijet Idle problem
Ken, this is a common problem on Digijet, it's a mix of 3 thing:
-Bad timing (or /and worn distributor!!!), check that mark on the
distributor (TDC#1) and align this one with the lower screw (the one to
loose the distributor for timing) rear end of this one(check bentley) and
forget the timing light (that is why the Vanagon distributor drive gear
SHOULD always be where she should be!!! position on crankshaft)
-Bad or worn throttle body, if this one is worned bad, forget stable idle
-Worn AFM... won't help anything, believe me...
Most of the time timing is just slightly off (to much advance most of the
time). But, if the idle srew (the big one on the throttle body) is way out
(counterclockwise), you have to much retard and the screw is out to
compensate a slow runing engine (to be sure, acceleration is sluggish), turn
this one IN.
So begin by aligned the distributor at #1 TDC, play with this one just a
bit, each way, you will need to go a clockwise as possible until the engine
acceleration get "sluggish", go back a bit (here goes my English), now, get
a good acceleration, now play with that throttle screw, screw this one in as
far as you can, all close if needed... how is it now?
90% of the time, this does the trick!
If that dosn't do it, swap AFM... and/or swap throttle body.
Let me know!
Ben
http://www.benplace.com/
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I have an 83.5 1.9l digijet Vanagon that I am having a problem with the
idle. First of all I never heard the van run. It came here after the owner
had blown up the last motor. I got a good used motor that was a low mileage
rebuild and put it in. It runs excellent, no smoke, and the only issue I
have with it is that when it is in Park (it is an automatic) the idle will
go up and hold or go up and down (oscillating). I have replaced all of the
vacuum lines on the engine, the idle control unit (it does the surging when
the ICU is bypassed), checked for vacuum leaks until I am sick of checking,
and I can't find the problem. The throttle postion switch works and seems to
be adjusted properly. The customer swears up and down that the van ran
perfectly smooth at idle before we put the new engine in (as I said I never
heard it run so I don't know for sure). It has all new cap, rotor, plugs,
and wires. I checked the vacuum advance and retard and they aren't leaking.
I checked the fuel pressure and it is within spec. Does anyone have any
other ideas that I can look at? My next check is valve adjustment. I haven't
adjusted them since the engine was supposedly running excellent before it
was pulled (again I didn't hear it run myself, getting this from the
seller). The van idles smoothly when it is in "Drive" or there is a load on
the engine like when I turn on the A/C. But sitting idling in Park with no
load is when it acts goofy. Any ideas or similar experience would be
appreciated.
Thanks, Ken Wilford John 3:16
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