Date: Tue, 27 Nov 2001 08:29:20 -0500
Reply-To: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Subject: Re: 1985 FAST idle
Content-Type: text/plain; charset=us-ascii
Why do you have the idle screw all the way in? By-pass the idle stabilizer
and set your idle with the screw. Make sure the timing is still correct.
Shut it off and re-connect the idle stabilizer. Maybe the idle stabilizer
is bad? You can get the idle mixture pretty close by putting a voltmeter
on the O2 sensor wire. Should be around 0.7 VDC at idle (once hot). I
would give the throttle switch a little more clearance than the Bentley
says. It doesn't always return completely and a little more clearance will
allow it to stay in idle mode.
Jay
Ignace Speybrouck <ignace@SYMPATICO.CA>@gerry.vanagon.com> on 11/26/2001
10:16:05 PM
Please respond to Ignace Speybrouck <ignace@SYMPATICO.CA>
Sent by: Vanagon Mailing List <vanagon@gerry.vanagon.com>
To: vanagon@GERRY.VANAGON.COM
cc:
Subject: 1985 FAST idle
Hi,
I have a problem with the idle of my 85 GL Vanagon.
When I start it cold, it start willingly and settle to a very regular fast
idle.
When the temp needle begin to move, the engine slows a little bit and begin
to idle very roughly. Never dies though. Step on the gas and it revs
right
up with no misses or backfire. When I lift my foot from the gas pedal the
idle isn't going back as slow as it should. Runs very well on highway with
gas milleag around 25 mpg at 65 mph. Horrible figures though in town due
to
this FAST idle thing.
Here is what I did and adjust.
Full tune-up (cap, rotor, plugs, plug wires, timming set to 5 ATDC, air
filter, fuel filter)
The gas cable isn't sticky nor very old.
Throttle valve switch adusted as per Bentley (design with one switch)
New electrical connector to the AFM
No vaccuum leaks
Idle srew all the way in.
No difference in idle with idle stabilizer in or out
Complete new and tight exhaust system
New O2 sensor
All visible engine compartment ground cleaned
I have access to the CO adusting plug on the AFM, I guess a previous owner
removed the sealing cap. The adusting plug is way in the hole, Bentley
suggest that the plug should be flush with the top of the AFM. Since the
Vanagon is running fine except for the idle thing I didn't touched it yet.
Someone suggested the temp sending unit, the one that gives info to the
computer.
The van has about 110 000 miles.
Any ideas ?
Thanks in advance !
Ignace
1967 Volvo 144S
1985 Vanagon GL
1989 Mazda B2200 ($ 300 junk hauler)