Date: Sun, 11 Oct 1998 23:56:21 -0400
Reply-To: David Bogle / Architecture <bogle@BWAY.NET>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: David Bogle / Architecture <bogle@BWAY.NET>
Subject: Re: Idle Speed Adjustment - 1988 GL
Content-Type: text/plain; charset=us-ascii
John H. Rodgers wrote:
> -- [ From: John H. Rodgers * EMC.Ver #2.5.02 ] --
>
> Malcom, your comments have really helped me learn more about the fuel
> injection systems on the Vanagons.
>
> I still have some comments and questions and would appreciate your input if
> you would bear with me.
>
> For me to adjust the idle speed, I must follow the following proceedure in
> the Bentley's, section 25.51.
> *****************
> "Idle Speed and CO Content, checking and adjusting."
> --With ignition off, disconnect oxygen connector(1 in the picture 24-175)
> and the idle stabilizer control valve connector.(2 in the picture 24-175)
> -- Check Idle speed rpm, correct if necessary using adjusting screw (1 in
> picture 24-177)
> *******************
>
> So, from the Bentley's there is an idle stabilizer control box located
> behind the right taillight. (ref. picture 24-185 section 24.48). The note
> says "Installation location: in front of right tail light" For those who,
> like me, don't know, the unit is made so the plug is stationary and fixed to
> a support, and the unit itself can be pulled up to remove it from the plug.
> A new one can be simply pushed into place. No muss, no fuss. But you do have
> to remove the tail-light, and work in the blind. With the cables and ducting
> in that corner, you can't actually see the plug, but you can see the black
> box. However, there is not enough room to both see and work at the same time
> . Thus changing the plug in module is by feel only.
>
> >From Bentley in section 24.46 (picture 24-182) there is shown a Control
> Valve for Idle Stabilizer. This is also shown in section 24.53( picture 24-
> 187) and is identified as "Idle stabilizer valve". The valve housing can be
> see in the bottom right corner of picture 24-175 and in the lower left of
> picture 24-177. I take it that this is the solenoid operated valve of which
> you spoke.
>
> As suggested by some, I should unplug two leads and plug them together to
> bypass the IS. That doesn't work here per the fixed plug discussion above.
>
> To follow the prescribed procedure, I need to disconnect the "Idle
> Stabilizer Control Valve Connector". I know this would disable the solenoid
> , allowing for adjustment of the idle screw to have the proper effect. I
> have been unable to find/identify that connector. Seems simple enough from
> the picture, but it eludes me.
>
> I would think that one of the wires to the solenoid is ground and the other
> power, with the power side having the disconnect and when connected being
> connected to the control box at some point.
>
> I am sure open to suggestions on this one.
>
> Thanks,
>
> John Rodgers
> '88 GL Driver.
>
> --
Hello John and all,
My '87 syncro westy has the configuration described by you, John, and not the
other set up that Malcolm Holser and Johan Nyberg have.
I was just checking my idle stabilizer this afternoon per "idle stabilizer,
checking/1st check on 24.53 in the Bentley. Firstly, the idle stabilizer valve
does not hum or vibrate detectably. Should the vibration or humming from it be
readily apparent with the key on, or is it very subtle? I unplugged the wiring
connection on its left end and could not discern a difference, except for maybe
an electrical contact sound. If wiring is intact to the IS control unit, then
bentley says replace the IS control unit. Is this the $210 item (025 906 457A )
for sale at the BusDepot (and elsewhere I'm sure)? Or is that the "idle
stabilizer valve?" If so, where can you get the control unit?
Thanks, and we hope to see some of you at the first annual BBTT this weekend.
--
David Bogle
'72 Campmobile 2.0L (_*_*_Still For Sale_*_*_)
'87 Vanagon GL Syncro Westfalia
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