Date: Tue, 22 Jun 2004 10:57:06 -0400
Reply-To: vw4x4@FYI.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Eric Zeno <vw4x4@FYI.NET>
Subject: Re: bucking on deceleration...one problem after another
In-Reply-To: <40D844C8.2010109@bellsouth.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
This is caused by the throttle position switch out of
adjustment. I've found it almost impossible to get
these within spec..... good luck....
Also there is an update to the 1986 models, to make
adjusting easier.
ERic
John Rodgers wrote:
> 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.
>>
>> _________________________________________________________________
>> Watch the online reality show Mixed Messages with a friend and enter
>> to win
>> a trip to NY
>> http://www.msnmessenger-download.click-url.com/go/onm00200497ave/direct/01/
>>
>>
>>
>
>
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