Mark, my 88 GL did that. Disconnected the Idle Stabilizer Valve and it
stopped. You might give that a try.

Regards,

John Rodgers
88 GL Driver

Mark Seifert wrote:

> Since I bought my 86 Vanagon, it's been giving me one problem after
> another.
> I get one thing figured out, then it runs fine for a while, and something
> else comes up. Then problems seem to fix themselves, or just disappear
> magically. But I refuse to get rid of it, because when it's running
> well, I
> love it.
>
> I had that "cold idle mystery" problem for a long time, then it seem
> to just
> suddenly go away yesterday morning when I started it up. I was really
> surprised. I have been tinkering with a few things here and there, I
> adjusted the afm a few times, only to find it runs best in the original
> position. I replaced the o2 sensor, and hooked it up to a 4-gas
> analyzer for
> a few hours the other day, adjusting the mixture. It seems to be getting
> better gas mileage, 18 mpg, which is not great, but better than before. I
> found a vacuum leak at one of the injector seals, but that didn't make
> much
> difference. I adjusted the valves, replaced the temp sensor and
> cleaned all
> the grounds.
>
> Anyway my new problem, which just started about 4 days ago, is when I let
> off the gas pedal at slower speeds the van starts bucking. It does
> this when
> I'm driving around town, between stop signs, and when coming off the
> freeway, coasting to a stop in gear. Of course when I press the clutch it
> stops. It also does the same thing when I take off from a stop without
> giving it a lot of gas. Feels like clutch chatter, but right now I'm not
> assuming its a clutch problem because I just had the engine out a few
> weeks
> ago and the clutch disc looked like it had about 80% of life left.
>
> I have had the van loaded with about 700 pounds of band equipment for the
> last few days. I wonder if that might have anything to do with it? Maybe
> I'll unload it and see if that changes anything. I'm wondering if
> maybe it
> has something to do with the throttle switch. Isn't it supposed to
> lean out
> the fuel mixture when you let off the throttle? I don't know...I've been
> testing and adjusting everything I can think of, and now I'm stumped.
>
> Has anyone had this problem and found a cure?
>
> I've also been trying to diagnose the A/C problems. I think it just
> needs to
> be charged...I'm saving my money to buy either 2 lbs of R-12 or 1
> conversion
> kit. But when I turn the A/C on, the idle goes WAY up. I'm talking about
> 2500-3000 RPM. I know it's supposed to go up when the A/C is on, but come
> on...3000 RPM??!! I've been told that this is caused by a bad idle
> stabilization unit. If it's bad, when the computer looks for a signal
> from
> the unit and finds an open circuit, it just goes crazy. But before I
> buy one
> of those, maybe I'll just charge the system. Maybe the compressor is
> working
> too hard when there's not enough refrigerant in there. Or something like
> that. Ahh, so many annoying problems...
>
> Anyway I'll stop rambling. If you've read this far, thank you.
>
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