Date: Sun, 11 Oct 1998 13:49:24 -0500
Reply-To: "John H. Rodgers" <inua@QUICKLINK.NET>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: "John H. Rodgers" <inua@QUICKLINK.NET>
Subject: Idle Speed Adjustment - 1988 GL
-- [ 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.
--
