Date:         Thu, 22 May 1997 06:44:40 -0400
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         kelphoto@mail.bright.net (mark keller)
Subject:      Re: High Idle on 87

>Date: Thu, 22 May 1997 06:44:13 -0400
>To:dfilcoff@stlnet.com
>From:kelphoto@bright.net (mark keller)
>Subject:Re: High Idle on 87
>
>>High Idle on 87 2.1 l Digifant
>>I did some more trouble shooting today.  I checked the throttle return =
>>spring, it works fine.  I checked the vacuum lines, When I disconnected =
>>the white or purple vacuum lines, the ones that come from the big =
>>canister in the passenger side rear wheel well, nothing happened.  Yes I =
>>mean absolutely NOTHING.  This would cause me to think that either the =
>>lines were cracked or there is a problem with this canister.  The lines =
>>were not cracked and the connections are good.  So what is this canister =
>>what does it do, and how can I check it?
>
>The canister is a charcole purge canister that recyclies gas vapors from
>the gas tank. This no vaccum source attachet to it. True they are vaccum
>hoses, but they vent only.
>
>With the engine running, and all safety precautions taken, you could
>attach of vaccuum gage to the motor right at the main vacuum source
>nipple, use a plastic tee connector if you only have one place and it of
>course has a hose on it.  With the guage attached use a pair of needle
>nose pliers to one by one momentarily crimp the major branchs of the
>vacuum system near the source nipple. Watch the guage for "rise", a better
>vacuum.  If this occurs,follow that branch crimping after each split in
>it's distrubution, watching each time for the "rise in vacuum pressure."
>
>If you have a vacuum leak in a hose,this method will quickly locate it. If
>no improvement in vacuum pressure occurs, and your vacuum pressure is low,
>at idle, 15 inches or less I believe, healthy is at 17-22 inches, then a
>engine vacuum leak is a good possibilty.  People spray a squirt of soapy
>solution, or starting fluid at the intake manifold connetions, to either
>see bubbles or a rise in the engine RPM.
>>
>>Dave
>>87 GL Wolfsburg (120k)
>>Dfilcoff@stlnet.com
>>http://home.stlnet.com/~dfilcoff
>