Does the carb have a choke pulloff on it. I owned a 66 that had some
of the problems described. I was looking under the hood with the
former owner of this car & happened to touch what I now know is the
choke pulloff. When I touched the linkage, it opened & the engine
smoothed right out. I believe this was about a $5.00 item & what a
difference.
John
KerryPinkerton wrote:
> Ok Dr. Dick, I did that. No noticable change other
> than when I completely choked off the primary with my
> hand (in a leather glove) the engine would slowly lose
> RPM and act like it would die. Note the choke was
> still on as I did not wait for the engine to warm up
> completly.
>
> Couple other things:
>
> When cold, the car misses pretty bad. It fires right
> up but runs rough, shakes and when the throttle is
> pressed will slowly clear and run smoother but does
> not smooth out completly until the choke is opened
> completly.
>
> The plugs are black which indicates a rich mixture or
> misfiring. however after a hard run they are still
> black and mileage sucks more than normal.
>
> The float is set correctly.
>
> I'm thinking about changing the plugs just for grins.
> (oh joy, changing plugs on a 73 is such sweet
> sorrow...) I'm grasping at straws.
>
> Also thinking about pullng the 500cfm Edelbrock off my
> son's mustang and seeing if it makes a difference. i
> have the spreadbore adapter.
>
> Keep those ideas coming.
>
> Kerry
> --- Dick Benjamin <DickB@xxxxxxxxx> wrote:
> > The way to tell if you have a vacuum leak is to
> > remove the air cleaner and
> > then, with the engine idling, slowly put your hand
> > or a piece of cardboard
> > over the airhorn such as to restrict the flow of air
> > into the carburetor.
> > Do this very slowly, progressively increasing the
> > air restriction, while
> > listening to the engine. If at ANY point between no
> > restriction at all and
> > stalling the engine, you hear an increase in RPM, or
> > a smoothing out of a
> > rough idle, you have a vacuum leak for sure. So try
> > that, and let's hear
> > your result before we go any further with the
> > diagnosis.
> >
> > Dick Benjamin
> > ----- Original Message -----
> > From: KerryPinkerton <pinkertonk@xxxxxxxxx>
> > To: IML <mailing-list@xxxxxxxxxxxxxxxx>
> > Sent: Friday, March 15, 2002 3:16 PM
> > Subject: IML: 440 vac leak??
> >
> >
> > > Well, I'm approaching stumped. My 73 runs like
> > crap
> > > and I've messed with it til I'm about out of
> > ideas.
> > >
> > > Here are the symptoms:
> > >
> > > Timing set at 10 degrees BTDC with the Vac adv
> > > disconnected and plugged.
> > >
> > > Vac gauge shows about 17, it used to be about 20.
> > >
> > > I have adjusted on the carb and timing and made
> > little
> > > change in the vac.
> > >
> > > i have disconnected and plugged ALL vac lines with
> > NO
> > > change on the vac guage.
> > >
> > > The car runs right now as well as it's run
> > recently
> > > WITH THE BREATHER OFF. With the breather on it is
> > > very FLAT at high RPM and has a slight bog if you
> > > punch it at idle. Turning the breather lid upside
> > > down and letting more air in helps but not as much
> > as
> > > removing the breather completely.
> > >
> > > Vacumm leak you say. I've tried the starter
> > spray,
> > > propane trick and get no RPM or engine noise
> > change.
> > >
> > > Compression is 130 per cyl.
> > >
> > > Now for the interesting stuff, under some
> > conditions
> > > of timing, I can screw the idle jets all the way
> > in
> > > and the car still runs which makes me think vacuum
> > > leak. Also the car will not idle down below about
> > 600
> > > RPM even with the screw completly backed out.
> > >
> > > Plugs are about a year old but probably don't have
> > a
> > > 1000 miles on the, same with wires, rotor button,
> > and
> > > cap. Cap does not show signs of damage or wear.
> > >
> > > At this point, the only think I can think of is
> > that
> > > there is a vacuum leak around the intake manifold,
> > > probably on the bottom where I can't get to it.
> > >
> > > Before I pull it off, I'd like to hear from the
> > wisdom
> > > of the group.
> > >
> > > Oh, one piece of good news is that my 'ticking'
> > sound
> > > was a bad exhaust manifold which has now been
> > > replaced.
> > >
> > > Kerryp
> > >
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