You said the vacuum advance does not work correct?
Fix that first and then move on, it may be the problem.
<BR>
<BR>
----- Original Message -----<BR>
From: Rocky Frisco <rock@rocky-frisco.com><BR>
Date: Sat, 16 Mar 2002 00:05:35 -0600<BR>
To: "MG List <mgs@autox.team.net>MG List <mgs@autox.team.net>MG List
<mgs@autox.team.net>MG List <mgs@autox.team.net>MG List"
<mgs@autox.team.net><BR>
Subject: Re: Lumpy idle<BR>
<BR>
<BR>
> Jeff Sharpe wrote:<BR>
> > <BR>
> > Hi list,<BR>
> > <BR>
> > Trying to track down a lumpy low idle on my '71 B that has eluded me for
>a<BR>
> > long time. Seems like it would be a vacuum leak, but not sure. All ports
>on<BR>
> > the intake are plugged currently (found the vac advance was shot today, so
>I<BR>
> > disconnected it and plugged that port). I'm wondering about the
>remaining<BR>
> > emission plumbing, and if it could be a factor. Air Pump and Run-On valve
>are<BR>
> > gone. A 'Y' line from the carbs and a line from the fuel tank evap are
>both<BR>
> > connected to the top of the charcoal canister. The large port on the
>bottom<BR>
> > of the canister has a plug in it. The valve cover breather is not
>connected<BR>
> > to anything. I tried connecting the valve cover port to the top of the<BR>
> > canister, and unplugging the lower port - no change. I'm probably way
>off<BR>
> > track, but I've been through the carbs, timing etc over and over. A clue
>may<BR>
> > be that it runs rich, even if I lean out the mixture all the way (air
>cleaner<BR>
> > off). By the way, carbs are orig HS4's, AUD 465, reshafted about five
>years<BR>
> > ago (and slightly leaky), new needles/seats/floats. Looked at the
>needles<BR>
> > today and they are both marked AAL. What am I missing?<BR>
> <BR>
> Hope this isn't useless (long stretch): lift gently up and down on<BR>
> the carb setup. Not hard enough to damage even a dodgy connection,<BR>
> just a sort of gentle test of the gasket and manifold nuts. More<BR>
> often than you might expect, it makes the idle speed go up and down<BR>
> noticeably. This indicates an intake air leak.<BR>
> <BR>
> It's proverbial in Minis, where radical situations can cause the<BR>
> carb(s) to hit the rear bulkhead, but I have seen it caused on an<BR>
> MGA when a #$%$#$ "mechanic" leaned his elbow on the front carb hard<BR>
> enough to compress the manifold gasket. Results: two burnt valves,<BR>
> one ruined seat, one holed piston. I assume the same would be<BR>
> possible on a B.<BR>
> <BR>
> -Rock http://www.rocky-frisco.com<BR>
> -- <BR>
> Red Dirt Rangers (Rocky on piano): http://www.reddirtrangers.com<BR>
> JJ Cale Live (w/Rocky): http://www.rocky-frisco.com/calelive.htm<BR>
> The Luggage Fan Club: http://groups.yahoo.com/group/luggage-fans<BR>
> <BR>
> ///<BR>
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