>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 >
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