Most kinds of grease are okay but Dielectric is a good one for o-rings as it keeps them well over the years. You may have a leak if the tube is not pressed in all the way but it could be other things as well. Take out the motor and tube and grease the seal up a bit and see if that helps but you may likely have something else going on. Grease does help the vacuum a bit because the seal stays soft and doesn't dry out as fast. However one could argue a seal is a seal and if it leaks you have a problem and grease won't help. Honestly, grease just helps it assemble easier and that's the main reason I use it but I do believe it adds to the life of the seal. Jeff in NC >From: "sweetp01569" <paul.sweet@xxxxxxxxxxxx> >Reply-To: dmcnews@xxxxxxxxxxxxxxx >To: dmcnews@xxxxxxxxxxxxxxx >Subject: Re: [DML] distributor cap and rotor >Date: Mon, 12 Sep 2005 11:30:50 -0000 > >How much does not greasing the idle speeb pipe and cup seal affect >idling. I have a hot idle problem that the idle goes up and down, >to the point of the engine almost stalling, then catching itself. >The tube is inside the O-ring, but I did not lube it when I >reinstalled. Can a lot of air pass through this? Does the grease >prevent the vacuum leak? Also, what kind of grease, like wheel >bearing grease? > > >Thanks, > >Paul > [moderator snip] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/