Nick, What Ben said for the line that goes to the vacuum pot on the air intake that makes the strange buzzing noise when it's in operation. On some models with single carbies (Stanza L16, and some L18/L20B engines) the vac line goes to a "T" piece under the air cleaner - 1 line goes to a thermostat that turns on/off the flap in the hot air hose that goes to the exhaust mani that Ben described.
The other line goes to another thermostat in the base of the air cleaner that opens if it detects an overheating condition and allows vacuum to escape into inlet mani and is supposed to increase the idle. This is a good idea in theory but in practice these switches leak and that might be what's happening to you. Get ride of the T piece or block the side that goes to the over heating thermostat (it's looks like a 1/4" wide flat spring about 1" long) and run just the hot air intake. For places like Sydney etc you really don't need the de-icer either but it's handy if you go skiing etc and it doesn't do any harm to performance or economy as long as it's not jammed shut so the carbie is sucking hot air all of the time. The symptoms of something wrong in this area are evident if the idle smooths out if you just disconnect the vac feed line under the carbie (and it's actually in the manifold on the strut side as the carbie outlet is the metered vac advance line and it's over the other side from memory). regards Terry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Ben Sent: Wednesday, 15 May 2002 3:26 AM To: [EMAIL PROTECTED] Subject: Re: Single carb vacuum signal questions you mean going to the long beak thing or the air cleaner???? that is jsut a vacuum switch that allows the hot air off the exhaust manifold so go into the air filter while the motor is cold ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, May 13, 2002 4:47 PM Subject: Single carb vacuum signal questions > List, > > What is the purpose of the hose that goes from the base of the carby at the throttle plate to the air cleaner/carb mouth? > > Should this hose even be hooked up this way. > It is acting as a vacuum leak (?!) > > Is there a website that explains the detail operation of the various circuits in a single carb? > > I have a vacuum leak problem. A high, unstable, rough idle - very sensitive to idle speed adjustment - very insensitive to adjustment of the idle air bleed screw. > > Thanks, > Nick > > This message was sent through MyMail http://www.mymail.com.au > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
