Date: Wed, 7 Aug 2002 16:43:17 -0400
Reply-To: "Warner, Jeff (DSIO-MS)" <Jeff.Warner@DSIO.DLA.MIL>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "Warner, Jeff (DSIO-MS)" <Jeff.Warner@DSIO.DLA.MIL>
Subject: Re: Fast Idle Problem & Timing Advance
The specs for an '86 2.1 call for 5 degrees BTDC measured at 2000 RPM with
the Temp II sensor removed. I was at 3 degrees. Not sure about your '84
1.9 and market destination (octane rating makes a difference too). I sure
like your mileage though. I've been getting crappy mileage but I'm not
surprised considering the problems I've been having and the fact that I've
been running the system closed-loop most of the time. I'm anxious to see
how it is now with the new Temp II sensor, idle control valve and timing
change.
Here's a link to what might be your specs. If your running 0 degrees than
you're effectively running 5 degrees advance comparitively speaking since
you're supposed to be running 5 degrees retard according to these specs.
Follow that logic??? ... Oops, there it goes!
http://www.oldvolkshome.com/ignition.htm#V8384
Jeff
-----Original Message-----
From: Greenamyer, William L [mailto:william.l.greenamyer@boeing.com]
Sent: Wednesday, August 07, 2002 4:23 PM
To: Warner, Jeff (DSIO-MS)
Subject: RE: Fast Idle Problem & Timing Advance
As far as I know, any change in advance affects RPM. My question to you is
what is the timeing supposed to be set at? 0 TDC? That is what my 84GL is
supposed to be set at and as far as I know, that is where it still is. last
check I was getting 22+MPG and that included a 6 degree grade every day and
sometimes traffic on the freeway. Doesn't advancing the timing to much
create a lot of mechanical problems in the engine?
William
-----Original Message-----
From: Warner, Jeff (DSIO-MS) [mailto:Jeff.Warner@DSIO.DLA.MIL]
Sent: Wednesday, August 07, 2002 10:38 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Fast Idle Problem & Timing Advance
Volks,
I too have been plagued by the fast idle syndrome. I thought I should pass
along my recent experiences.
A couple months back when the problem started happening (engine warm or
cold), I took a quick look at things, pulled the idle control valve, cleaned
it and pow! it was fixed! For a week. It was perfect for a week! When I
fired it up to leave on a weekend camping trip it was instantly back to the
high idle and wouldn't let up. So I pulled the connector on the valve and
dealt with warm up issues for the weekend.
Next two months I didn't look at it but did some research and planned an
approach.
Monday night I did the following:
Checked again for vacumm leaks - none found
Cleaned and replaced ground wires - no effect
Installed new Temp II sensor - no effect
Checked Throttle Position Switch - Not working, fixed it, no effect
Checked output of oxygen sensor - Right on the money at 5 volts
Replaced the Idle Control Valve with unit from my '87 - BINGO!
Purrs like a champ!
Decided to check the timing, found it at about 3 degrees BTDC so advanced it
to 5 and found idle too fast again but not as fast as before. Reasoning
that the idle had increased due to the timing change I backed off the idle
screw which seemed to correct things but I'm not sure. It was 1 AM so I had
to stop messing with it but I suspect that the idle control valve is once
again messing with me.
Questions: How much of a change in idle RPM can I expect from a two degree
change in advance? Any thoughts on what might be causing my throttle
control valves to fail after working initially? I've got another one I
might try tonight.
Thanks again.
Jeff Warner
Galloway, OH
'87 GL Weekender "Van"
'86 Wolfsburg Westy Weekender "Barry"
CI 94 (including compressors!)
