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Date:         Fri, 9 Mar 2007 16:06:16 -0800
Reply-To:     jon <jon@KENNEKE.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         jon <jon@KENNEKE.COM>
Subject:      Re: Idle stabilization control question
Comments: To: Tim Marciniak <tmarciniak@WI.RR.COM>
In-Reply-To:  <F2536947-58B9-4E75-9C82-EC98DF79D057@wi.rr.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII

Tim,

Sounds like you covered your bases. Sure, an ISV could still hum and be malfunctioning. Also, the control unit (behind the tail light) could be bad.

Swap with known good units, and see if that solves the problem. Neither one is cheap, though.

Jon

On Fri, 9 Mar 2007, Tim Marciniak wrote:

> Has anyone had an idle stablization control valve that hummed as > Bentley describes it should, but found that after replacing it their > idle problems were solved? > > My van idles at 1200. Runs fine, starts fine. But I cannot get it > to idle below 1200 rpm. I have spent hours trying to figure this > thing out. Here's run down of what I've done. > > -complete ignition tuneup, plugs, plug wires, new distributor cap, > checked timing > -cleaned all ground connections and replaced all ground connectors > -replaced temp sensor x2 > -found open circuit from temp 2 to terminal 10 of ECU. I replaced > this wire. I thought I had all my problems solved when I found this > and in fact it did fix a lot of my idle issues because prior to this > fix I had even more driveability issues. > -adjusted and checked throttle position switch > -cleaned idle stabilzation control valve with carb cleaner and > verified that its humming away. > -cleaned throttle valve > -new O2 sensor > -checked fuel pressure--ok > -no vacuum leaks > -checked air intake system, verified that I had no false air issues > -replaced idle stabilization control unit (this is the last thing I did) > -passed state emission test two weeks ago > > Van runs smooth, no lumpy idle, no hesitation or surging issues, just > idles high at 1200. Only thing I can think that is left to do is > replace the idle stabilization control valve on top of the engine. > > Tim > 90 Multivan >


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