John,
I endured these identical maladies last week. Thought I had adjusted the
idle position sensor satisfactorily. I could hear the switch click on and
off the idle position but, I still had the same symptoms. As it turns out, I
went too far past correct. That switch has to make just as the throttle is
closing and open as soon as it starts to open. I believe the Bentley might
give some quantitative figures.
Ken Lewis
http://neksiwel.20m.com/

----- Original Message -----
From: "John Bange" <jbange@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, September 14, 2008 8:29 PM
Subject: Re: [VANAGON] Weak..... so weak

> So after a couple hours part-swapping and generally diagnosing, I've
> come up with the following:
> Fuel delivery: OK
> Timing: OK
> ECU: OK
> Air flow meter: OK
> Cat: OK
>
> Driving up and down the street clearly shows when the problem shows
> up. When the idle switch is engaged the engine runs and idles just
> fine. The second the idle switch is disengaged, wheezing, coughing,
> and associated engine melodramatics. So what does the ECU ignore at
> idle that might cause? Too tired to continue today. Tomorrow the
> multimeter comes out and the wiring harness and sensors get tested.
>
> --
> John Bange
> '90 Vanagon - "Lastwagen"
> '90 Vanagon GL - "Wiesel"
>