John Fredrikson wrote:
>
> Thanks Bill and Rich. I'll have to check again how the canister is connected.
>I
> think there are two lines connected to it at the moment. One from the carbs
>and one
> from the tank. The third (the largest) is plugged (by the PO). There is no
>anit
> run-on valve connected to it. I suppose it too was removed by the PO. Is
>there a
> good way of bypassing the canister? Is it needed or just another part of the
> emission controls (most of which has already been removed by the PO)?
>
> Thanks again,
> Fred - who is about ready to schedule an appointment with Quality Coaches
>
> Rich Mason wrote:
>
> > At 08:46 AM 7/14/98 -0400, you wrote:
> >
> > >> Well, the fuel lines checked out OK. There weren't any kinks. I
> > disconnected the
> > >> vent lines (the ones that connect from the carbs to the charcoal
> > canister) and it
> > >> started and ran fine. There was a kink in the vent hose from the carbs
> > (HIF-4's) to
> > >> the canister so I replaced the line. I still could not get it to run for
> > more than
> > >> 30 seconds. By adjusting the carbs I was able to get it to idle (roughly)
> > >> eventually, but when I reved it up to about 3500 RPM it would die. When I
> > disconnect
> > >> the vent lines I am able to get a decent idle. How exactly are the vent
>lines
> > >> supposed to be connected? Is there another way I should try to connect
> > them? I'm
> > >> open for suggestions (except if they involve a Webber purchase.....for
>now).
> > >>
> > >> Thanks,
> > >> Fred
> >
> > Fred -
> >
> > I've missed some of the thread but one thing I haven't heard any mention of
> > - the solenoid "anti run-on valve" that prevents run-on after the engine is
> > stopped. It is mounted on the front bottom of the charcoal canister and is
> > triggered by the ignition switch and oil pressure. I don't have my manual
> > handy - but you might want to check if it's functioning properly.
> >
> > My understanding of how this works: Under normal operation, the valve is
> > closed when the engine is running. When you turn off the ignition, the
> > valve is energized (opened) until the oil pressure drops down to a very low
> > pressure, then it is de-energized(closed). If you listen during shutdown -
> > you can hear the solenoid valve click shut as the oil pressure approaches 0.
> > The opening of the valve vents the carb - preventing run-on. It sounds like
> > your valve is open all the time causing a very lean condition.
> >
> > Good luck,
> >
> > Rich Mason
> > '73 MGB
> > Madison, AL
> > ------------------------------------------
> > e-mail--> rmason@ro.com
> > MG Page-> http://ro.com/~rmason/mgpage.htm
> > NABMS --> http://www.geocities.con/MotorCity/Garage/5207/
> > ------------------------------------------
Fred,
I don't think your car was equipped with the "run-on" valve. Believe it
began appearing on the '73 model. The plugged connector on your
cannister should have a hose running to the tube on the rear of the
valve cover.
As John Twist mentions, the vapor control system has nothing to do with
the "active" emission control system, i.e., the air pump, gulp valve,
and all that. It is a good system to have installed and functional and
has no effect upon the performance of the engine whatsoever. Recommend
you unplug that port, connect it to the valve cover and see how your car
runs. If it still exhibits the symptoms, I would imagine the cannister
needs to be replaced. You might also consider "blowing out" all the
lines to make sure there is no blockage in any of them - particularly
the one to the tank!
--
*Bill Schooler *Check the MGCC Wash DC Centre Web Page
*Woodbridge, VA *http://members.aol.com/mgccwdcc/
*schooler@erols.com
*53 TD
*60 MGA
*69 MGB/GT
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